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From emblempar...@apache.org
Subject [17/18] incubator-ariatosca git commit: ARIA-105 Integrate parser and orchestrator models
Date Fri, 17 Mar 2017 19:38:45 GMT
http://git-wip-us.apache.org/repos/asf/incubator-ariatosca/blob/09f826a1/aria/modeling/service_instance.py
----------------------------------------------------------------------
diff --git a/aria/modeling/service_instance.py b/aria/modeling/service_instance.py
new file mode 100644
index 0000000..5c2cf54
--- /dev/null
+++ b/aria/modeling/service_instance.py
@@ -0,0 +1,1553 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# pylint: disable=too-many-lines, no-self-argument, no-member, abstract-method
+
+from sqlalchemy import (
+    Column,
+    Text,
+    Integer
+)
+from sqlalchemy import DateTime
+from sqlalchemy.ext.associationproxy import association_proxy
+from sqlalchemy.ext.declarative import declared_attr
+
+from .mixins import InstanceModelMixin
+from ..parser import validation
+from ..parser.consumption import ConsumptionContext
+from ..utils import collections, formatting, console
+from . import (
+    relationships,
+    utils,
+    types as modeling_types
+)
+
+
+class ServiceBase(InstanceModelMixin): # pylint: disable=too-many-public-methods
+    """
+    A service is usually an instance of a :class:`ServiceTemplate`.
+
+    You will usually not create it programmatically, but instead instantiate it from a service
+    template.
+
+    :ivar name: Name (unique for this ARIA installation)
+    :vartype name: basestring
+    :ivar service_template: Template from which this service was instantiated (optional)
+    :vartype service_template: :class:`ServiceTemplate`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar meta_data: Custom annotations
+    :vartype meta_data: {basestring: :class:`Metadata`}
+    :ivar node: Nodes
+    :vartype node: {basestring: :class:`Node`}
+    :ivar groups: Groups of nodes
+    :vartype groups: {basestring: :class:`Group`}
+    :ivar policies: Policies
+    :vartype policies: {basestring: :class:`Policy`]}
+    :ivar substitution: The entire service can appear as a node
+    :vartype substitution: :class:`Substitution`
+    :ivar inputs: Externally provided parameters
+    :vartype inputs: {basestring: :class:`Parameter`}
+    :ivar outputs: These parameters are filled in after service installation
+    :vartype outputs: {basestring: :class:`Parameter`}
+    :ivar workflows: Custom workflows that can be performed on the service
+    :vartype workflows: {basestring: :class:`Operation`}
+    :ivar plugin_specifications: Plugins required to be installed
+    :vartype plugin_specifications: {basestring: :class:`PluginSpecification`}
+    :ivar created_at: Creation timestamp
+    :vartype created_at: :class:`datetime.datetime`
+    :ivar updated_at: Update timestamp
+    :vartype updated_at: :class:`datetime.datetime`
+
+    :ivar permalink: ??
+    :vartype permalink: basestring
+    :ivar scaling_groups: ??
+    :vartype scaling_groups: {}
+
+    :ivar modifications: Modifications of this service
+    :vartype modifications: [:class:`ServiceModification`]
+    :ivar updates: Updates of this service
+    :vartype updates: [:class:`ServiceUpdate`]
+    :ivar executions: Executions on this service
+    :vartype executions: [:class:`Execution`]
+    """
+
+    __tablename__ = 'service'
+
+    @declared_attr
+    def service_template(cls):
+        return relationships.many_to_one(cls, 'service_template')
+
+    description = Column(Text)
+
+    @declared_attr
+    def meta_data(cls):
+        # Warning! We cannot use the attr name "metadata" because it's used by SQLAlchemy!
+        return relationships.many_to_many(cls, 'metadata', dict_key='name')
+
+    @declared_attr
+    def nodes(cls):
+        return relationships.one_to_many(cls, 'node', dict_key='name')
+
+    @declared_attr
+    def groups(cls):
+        return relationships.one_to_many(cls, 'group', dict_key='name')
+
+    @declared_attr
+    def policies(cls):
+        return relationships.one_to_many(cls, 'policy', dict_key='name')
+
+    @declared_attr
+    def substitution(cls):
+        return relationships.one_to_one(cls, 'substitution')
+
+    @declared_attr
+    def inputs(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='inputs', dict_key='name')
+
+    @declared_attr
+    def outputs(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='outputs', dict_key='name')
+
+    @declared_attr
+    def workflows(cls):
+        return relationships.one_to_many(cls, 'operation', dict_key='name')
+
+    @declared_attr
+    def plugin_specifications(cls):
+        return relationships.many_to_many(cls, 'plugin_specification')
+
+    created_at = Column(DateTime, nullable=False, index=True)
+    updated_at = Column(DateTime)
+
+    # region orchestration
+
+    permalink = Column(Text)
+    scaling_groups = Column(modeling_types.Dict)
+
+    # endregion
+
+    # region foreign keys
+
+    @declared_attr
+    def substitution_fk(cls):
+        """Service one-to-one to Substitution"""
+        return relationships.fk('substitution', nullable=True)
+
+    @declared_attr
+    def service_template_fk(cls):
+        """For Service many-to-one to ServiceTemplate"""
+        return relationships.fk('service_template', nullable=True)
+
+    # endregion
+
+    # region association proxies
+
+    @declared_attr
+    def service_template_name(cls):
+        """Required for use by SQLAlchemy queries"""
+        return association_proxy('service_template', 'name')
+
+    # endregion
+
+    def satisfy_requirements(self):
+        satisfied = True
+        for node in self.nodes.itervalues():
+            if not node.satisfy_requirements():
+                satisfied = False
+        return satisfied
+
+    def validate_capabilities(self):
+        satisfied = True
+        for node in self.nodes.itervalues():
+            if not node.validate_capabilities():
+                satisfied = False
+        return satisfied
+
+    def is_node_a_target(self, target_node):
+        for node in self.nodes.itervalues():
+            if self._is_node_a_target(node, target_node):
+                return True
+        return False
+
+    def _is_node_a_target(self, source_node, target_node):
+        if source_node.outbound_relationships:
+            for relationship in source_node.outbound_relationships:
+                if relationship.target_node.name == target_node.name:
+                    return True
+                else:
+                    node = relationship.target_node
+                    if node is not None:
+                        if self._is_node_a_target(node, target_node):
+                            return True
+        return False
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('description', self.description),
+            ('metadata', formatting.as_raw_dict(self.meta_data)),
+            ('nodes', formatting.as_raw_list(self.nodes)),
+            ('groups', formatting.as_raw_list(self.groups)),
+            ('policies', formatting.as_raw_list(self.policies)),
+            ('substitution', formatting.as_raw(self.substitution)),
+            ('inputs', formatting.as_raw_dict(self.inputs)),
+            ('outputs', formatting.as_raw_dict(self.outputs)),
+            ('workflows', formatting.as_raw_list(self.workflows))))
+
+    def validate(self):
+        utils.validate_dict_values(self.meta_data)
+        utils.validate_dict_values(self.nodes)
+        utils.validate_dict_values(self.groups)
+        utils.validate_dict_values(self.policies)
+        if self.substitution is not None:
+            self.substitution.validate()
+        utils.validate_dict_values(self.inputs)
+        utils.validate_dict_values(self.outputs)
+        utils.validate_dict_values(self.workflows)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.meta_data, report_issues)
+        utils.coerce_dict_values(container, self.nodes, report_issues)
+        utils.coerce_dict_values(container, self.groups, report_issues)
+        utils.coerce_dict_values(container, self.policies, report_issues)
+        if self.substitution is not None:
+            self.substitution.coerce_values(container, report_issues)
+        utils.coerce_dict_values(container, self.inputs, report_issues)
+        utils.coerce_dict_values(container, self.outputs, report_issues)
+        utils.coerce_dict_values(container, self.workflows, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        if self.description is not None:
+            console.puts(context.style.meta(self.description))
+        utils.dump_dict_values(self.meta_data, 'Metadata')
+        for node in self.nodes.itervalues():
+            node.dump()
+        for group in self.groups.itervalues():
+            group.dump()
+        for policy in self.policies.itervalues():
+            policy.dump()
+        if self.substitution is not None:
+            self.substitution.dump()
+        utils.dump_dict_values(self.inputs, 'Inputs')
+        utils.dump_dict_values(self.outputs, 'Outputs')
+        utils.dump_dict_values(self.workflows, 'Workflows')
+
+    def dump_graph(self):
+        for node in self.nodes.itervalues():
+            if not self.is_node_a_target(node):
+                self._dump_graph_node(node)
+
+    def _dump_graph_node(self, node):
+        context = ConsumptionContext.get_thread_local()
+        console.puts(context.style.node(node.name))
+        if node.outbound_relationships:
+            with context.style.indent:
+                for relationship in node.outbound_relationships:
+                    if relationship.relationship_template is not None:
+                        relationship_name = context.style.node(
+                            relationship.relationship_template.name)
+                    elif relationship.type is not None:
+                        relationship_name = context.style.type(relationship.type.name)
+                    else:
+                        relationship_name = '?'
+                    if relationship.target_capability is not None:
+                        capability_name = context.style.node(relationship.target_capability.name)
+                    else:
+                        capability_name = None
+                    if capability_name is not None:
+                        console.puts('-> {0} {1}'.format(relationship_name, capability_name))
+                    else:
+                        console.puts('-> {0}'.format(relationship_name))
+                    target_node = relationship.target_node
+                    with console.indent(3):
+                        self._dump_graph_node(target_node)
+
+    __private_fields__ = ['substitution_fk',
+                          'service_template_fk',
+                          'service_template_name']
+
+
+class NodeBase(InstanceModelMixin): # pylint: disable=too-many-public-methods
+    """
+    Usually an instance of a :class:`NodeTemplate`.
+
+    Nodes may have zero or more :class:`Relationship` instances to other nodes.
+
+    :ivar name: Name (unique for this service)
+    :vartype name: basestring
+    :ivar node_template: Template from which this node was instantiated (optional)
+    :vartype node_template: :class:`NodeTemplate`
+    :ivar type: Node type
+    :vartype type: :class:`Type`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+    :ivar interfaces: Bundles of operations
+    :vartype interfaces: {basestring: :class:`Interface`}
+    :ivar artifacts: Associated files
+    :vartype artifacts: {basestring: :class:`Artifact`}
+    :ivar capabilities: Exposed capabilities
+    :vartype capabilities: {basestring: :class:`Capability`}
+    :ivar outbound_relationships: Relationships to other nodes
+    :vartype outbound_relationships: [:class:`Relationship`]
+    :ivar inbound_relationships: Relationships from other nodes
+    :vartype inbound_relationships: [:class:`Relationship`]
+    :ivar plugin_specifications: Plugins required to be installed on the node's host
+    :vartype plugin_specifications: {basestring: :class:`PluginSpecification`}
+    :ivar host: Host node (can be self)
+    :vartype host: :class:`Node`
+
+    :ivar runtime_properties: TODO: should be replaced with attributes
+    :vartype runtime_properties: {}
+    :ivar scaling_groups: ??
+    :vartype scaling_groups: []
+    :ivar state: ??
+    :vartype state: basestring
+    :ivar version: Used by `aria.storage.instrumentation`
+    :vartype version: int
+
+    :ivar service: Containing service
+    :vartype service: :class:`Service`
+    :ivar groups: We are a member of these groups
+    :vartype groups: [:class:`Group`]
+    :ivar policies: Policies enacted on this node
+    :vartype policies: [:class:`Policy`]
+    :ivar substitution_mapping: Our contribution to service substitution
+    :vartype substitution_mapping: :class:`SubstitutionMapping`
+    :ivar tasks: Tasks on this node
+    :vartype tasks: [:class:`Task`]
+    """
+
+    __tablename__ = 'node'
+
+    @declared_attr
+    def node_template(cls):
+        return relationships.many_to_one(cls, 'node_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    description = Column(Text)
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    @declared_attr
+    def interfaces(cls):
+        return relationships.one_to_many(cls, 'interface', dict_key='name')
+
+    @declared_attr
+    def artifacts(cls):
+        return relationships.one_to_many(cls, 'artifact', dict_key='name')
+
+    @declared_attr
+    def capabilities(cls):
+        return relationships.one_to_many(cls, 'capability', dict_key='name')
+
+    @declared_attr
+    def outbound_relationships(cls):
+        return relationships.one_to_many(cls, 'relationship', child_fk='source_node_fk',
+                                         child_property='source_node')
+
+    @declared_attr
+    def inbound_relationships(cls):
+        return relationships.one_to_many(cls, 'relationship', child_fk='target_node_fk',
+                                         child_property='target_node')
+
+    @declared_attr
+    def plugin_specifications(cls):
+        return relationships.many_to_many(cls, 'plugin_specification', dict_key='name')
+
+    @declared_attr
+    def host(cls):
+        return relationships.one_to_one_self(cls, 'host_fk')
+
+    # region orchestration
+
+    runtime_properties = Column(modeling_types.Dict)
+    scaling_groups = Column(modeling_types.List)
+    state = Column(Text, nullable=False)
+    version = Column(Integer, default=1)
+
+    __mapper_args__ = {'version_id_col': version} # Enable SQLAlchemy automatic version counting
+
+    @property
+    def ip(self):
+        # TODO: totally broken
+        if not self.host_fk:
+            return None
+        host_node = self.host
+        if 'ip' in host_node.runtime_properties:  # pylint: disable=no-member
+            return host_node.runtime_properties['ip']  # pylint: disable=no-member
+        host_node = host_node.node_template  # pylint: disable=no-member
+        host_ip_property = host_node.properties.get('ip')
+        if host_ip_property:
+            return host_ip_property.value
+        return None
+
+    # endregion
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Node many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def host_fk(cls):
+        """For Node one-to-one to Node"""
+        return relationships.fk('node', nullable=True)
+
+    @declared_attr
+    def service_fk(cls):
+        """For Service one-to-many to Node"""
+        return relationships.fk('service')
+
+    @declared_attr
+    def node_template_fk(cls):
+        """For Node many-to-one to NodeTemplate"""
+        return relationships.fk('node_template', nullable=True)
+
+    # endregion
+
+    # region association proxies
+
+    @declared_attr
+    def service_name(cls):
+        """Required for use by SQLAlchemy queries"""
+        return association_proxy('service', 'name')
+
+    # endregion
+
+    def satisfy_requirements(self):
+        node_template = self.node_template
+        satisfied = True
+        for requirement_template in node_template.requirement_templates:
+            # Find target template
+            target_node_template, target_node_capability = \
+                requirement_template.find_target(node_template)
+            if target_node_template is not None:
+                satisfied = self._satisfy_capability(target_node_capability,
+                                                     target_node_template,
+                                                     requirement_template)
+            else:
+                context = ConsumptionContext.get_thread_local()
+                context.validation.report('requirement "{0}" of node "{1}" has no target node '
+                                          'template'.format(requirement_template.name, self.name),
+                                          level=validation.Issue.BETWEEN_INSTANCES)
+                satisfied = False
+        return satisfied
+
+    def _satisfy_capability(self, target_node_capability, target_node_template,
+                            requirement_template):
+        from . import models
+        context = ConsumptionContext.get_thread_local()
+        # Find target nodes
+        target_nodes = target_node_template.nodes.all()
+        if target_nodes:
+            target_node = None
+            target_capability = None
+
+            if target_node_capability is not None:
+                # Relate to the first target node that has capacity
+                for node in target_nodes:
+                    target_capability = node.capabilities.get(target_node_capability.name)
+                    if target_capability.relate():
+                        target_node = node
+                        break
+            else:
+                # Use first target node
+                target_node = target_nodes[0]
+
+            if target_node is not None:
+                if requirement_template.relationship_template is not None:
+                    relationship = \
+                        requirement_template.relationship_template.instantiate(self)
+                else:
+                    relationship = models.Relationship(target_capability=target_capability)
+                relationship.name = requirement_template.name
+                relationship.requirement_template = requirement_template
+                relationship.target_node = target_node
+                self.outbound_relationships.append(relationship)
+                return True
+            else:
+                context.validation.report('requirement "{0}" of node "{1}" targets node '
+                                          'template "{2}" but its instantiated nodes do not '
+                                          'have enough capacity'.format(
+                                              requirement_template.name,
+                                              self.name,
+                                              target_node_template.name),
+                                          level=validation.Issue.BETWEEN_INSTANCES)
+                return False
+        else:
+            context.validation.report('requirement "{0}" of node "{1}" targets node template '
+                                      '"{2}" but it has no instantiated nodes'.format(
+                                          requirement_template.name,
+                                          self.name,
+                                          target_node_template.name),
+                                      level=validation.Issue.BETWEEN_INSTANCES)
+            return False
+
+    def validate_capabilities(self):
+        context = ConsumptionContext.get_thread_local()
+        satisfied = False
+        for capability in self.capabilities.itervalues():
+            if not capability.has_enough_relationships:
+                context.validation.report('capability "{0}" of node "{1}" requires at least {2:d} '
+                                          'relationships but has {3:d}'.format(
+                                              capability.name,
+                                              self.name,
+                                              capability.min_occurrences,
+                                              capability.occurrences),
+                                          level=validation.Issue.BETWEEN_INSTANCES)
+                satisfied = False
+        return satisfied
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('type_name', self.type.name),
+            ('properties', formatting.as_raw_dict(self.properties)),
+            ('interfaces', formatting.as_raw_list(self.interfaces)),
+            ('artifacts', formatting.as_raw_list(self.artifacts)),
+            ('capabilities', formatting.as_raw_list(self.capabilities)),
+            ('relationships', formatting.as_raw_list(self.outbound_relationships))))
+
+    def validate(self):
+        context = ConsumptionContext.get_thread_local()
+        if len(self.name) > context.modeling.id_max_length:
+            context.validation.report('"{0}" has an ID longer than the limit of {1:d} characters: '
+                                      '{2:d}'.format(
+                                          self.name,
+                                          context.modeling.id_max_length,
+                                          len(self.name)),
+                                      level=validation.Issue.BETWEEN_INSTANCES)
+
+        # TODO: validate that node template is of type?
+
+        utils.validate_dict_values(self.properties)
+        utils.validate_dict_values(self.interfaces)
+        utils.validate_dict_values(self.artifacts)
+        utils.validate_dict_values(self.capabilities)
+        utils.validate_list_values(self.outbound_relationships)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(self, self.properties, report_issues)
+        utils.coerce_dict_values(self, self.interfaces, report_issues)
+        utils.coerce_dict_values(self, self.artifacts, report_issues)
+        utils.coerce_dict_values(self, self.capabilities, report_issues)
+        utils.coerce_list_values(self, self.outbound_relationships, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts('Node: {0}'.format(context.style.node(self.name)))
+        with context.style.indent:
+            console.puts('Type: {0}'.format(context.style.type(self.type.name)))
+            console.puts('Template: {0}'.format(context.style.node(self.node_template.name)))
+            utils.dump_dict_values(self.properties, 'Properties')
+            utils.dump_interfaces(self.interfaces)
+            utils.dump_dict_values(self.artifacts, 'Artifacts')
+            utils.dump_dict_values(self.capabilities, 'Capabilities')
+            utils.dump_list_values(self.outbound_relationships, 'Relationships')
+
+    __private_fields__ = ['type_fk',
+                          'host_fk',
+                          'service_fk',
+                          'node_template_fk',
+                          'service_name']
+
+class GroupBase(InstanceModelMixin):
+    """
+    Usually an instance of a :class:`GroupTemplate`.
+
+    :ivar name: Name (unique for this service)
+    :vartype name: basestring
+    :ivar group_template: Template from which this group was instantiated (optional)
+    :vartype group_template: :class:`GroupTemplate`
+    :ivar type: Group type
+    :vartype type: :class:`Type`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar nodes: Members of this group
+    :vartype nodes: [:class:`Node`]
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+    :ivar interfaces: Bundles of operations
+    :vartype interfaces: {basestring: :class:`Interface`}
+
+    :ivar service: Containing service
+    :vartype service: :class:`Service`
+    :ivar policies: Policies enacted on this group
+    :vartype policies: [:class:`Policy`]
+    """
+
+    __tablename__ = 'group'
+
+    @declared_attr
+    def group_template(cls):
+        return relationships.many_to_one(cls, 'group_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    description = Column(Text)
+
+    @declared_attr
+    def nodes(cls):
+        return relationships.many_to_many(cls, 'node')
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    @declared_attr
+    def interfaces(cls):
+        return relationships.one_to_many(cls, 'interface', dict_key='name')
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Group many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def service_fk(cls):
+        """For Service one-to-many to Group"""
+        return relationships.fk('service')
+
+    @declared_attr
+    def group_template_fk(cls):
+        """For Group many-to-one to GroupTemplate"""
+        return relationships.fk('group_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('properties', formatting.as_raw_dict(self.properties)),
+            ('interfaces', formatting.as_raw_list(self.interfaces))))
+
+    def validate(self):
+        utils.validate_dict_values(self.properties)
+        utils.validate_dict_values(self.interfaces)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.properties, report_issues)
+        utils.coerce_dict_values(container, self.interfaces, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts('Group: {0}'.format(context.style.node(self.name)))
+        with context.style.indent:
+            console.puts('Type: {0}'.format(context.style.type(self.type.name)))
+            utils.dump_dict_values(self.properties, 'Properties')
+            utils.dump_interfaces(self.interfaces)
+            if self.nodes:
+                console.puts('Member nodes:')
+                with context.style.indent:
+                    for node in self.nodes:
+                        console.puts(context.style.node(node.name))
+
+    __private_fields__ = ['type_fk',
+                          'service_fk',
+                          'group_template_fk']
+
+
+class PolicyBase(InstanceModelMixin):
+    """
+    Usually an instance of a :class:`PolicyTemplate`.
+
+    :ivar name: Name (unique for this service)
+    :vartype name: basestring
+    :ivar policy_template: Template from which this policy was instantiated (optional)
+    :vartype policy_template: :class:`PolicyTemplate`
+    :ivar type: Policy type
+    :vartype type: :class:`Type`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar nodes: Policy will be enacted on all these nodes
+    :vartype nodes: [:class:`Node`]
+    :ivar groups: Policy will be enacted on all nodes in these groups
+    :vartype groups: [:class:`Group`]
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+
+    :ivar service: Containing service
+    :vartype service: :class:`Service`
+    """
+
+    __tablename__ = 'policy'
+
+    @declared_attr
+    def policy_template(cls):
+        return relationships.many_to_one(cls, 'policy_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    description = Column(Text)
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    @declared_attr
+    def nodes(cls):
+        return relationships.many_to_many(cls, 'node')
+
+    @declared_attr
+    def groups(cls):
+        return relationships.many_to_many(cls, 'group')
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Policy many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def service_fk(cls):
+        """For Service one-to-many to Policy"""
+        return relationships.fk('service')
+
+    @declared_attr
+    def policy_template_fk(cls):
+        """For Policy many-to-one to PolicyTemplate"""
+        return relationships.fk('policy_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('type_name', self.type.name),
+            ('properties', formatting.as_raw_dict(self.properties))))
+
+    def validate(self):
+        utils.validate_dict_values(self.properties)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.properties, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts('Policy: {0}'.format(context.style.node(self.name)))
+        with context.style.indent:
+            console.puts('Type: {0}'.format(context.style.type(self.type.name)))
+            utils.dump_dict_values(self.properties, 'Properties')
+            if self.nodes:
+                console.puts('Target nodes:')
+                with context.style.indent:
+                    for node in self.nodes:
+                        console.puts(context.style.node(node.name))
+            if self.groups:
+                console.puts('Target groups:')
+                with context.style.indent:
+                    for group in self.groups:
+                        console.puts(context.style.node(group.name))
+
+    __private_fields__ = ['type_fk',
+                          'service_fk',
+                          'policy_template_fk']
+
+
+class SubstitutionBase(InstanceModelMixin):
+    """
+    Used to substitute a single node for the entire deployment.
+
+    Usually an instance of a :class:`SubstitutionTemplate`.
+
+    :ivar substitution_template: Template from which this substitution was instantiated (optional)
+    :vartype substitution_template: :class:`SubstitutionTemplate`
+    :ivar node_type: Exposed node type
+    :vartype node_type: :class:`Type`
+    :ivar mappings: Requirement and capability mappings
+    :vartype mappings: {basestring: :class:`SubstitutionTemplate`}
+
+    :ivar service: Containing service
+    :vartype service: :class:`Service`
+    """
+
+    __tablename__ = 'substitution'
+
+    @declared_attr
+    def substitution_template(cls):
+        return relationships.many_to_one(cls, 'substitution_template')
+
+    @declared_attr
+    def node_type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    @declared_attr
+    def mappings(cls):
+        return relationships.one_to_many(cls, 'substitution_mapping', dict_key='name')
+
+    # region foreign_keys
+
+    @declared_attr
+    def node_type_fk(cls):
+        """For Substitution many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def substitution_template_fk(cls):
+        """For Substitution many-to-one to SubstitutionTemplate"""
+        return relationships.fk('substitution_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('node_type_name', self.node_type_name),
+            ('mappings', formatting.as_raw_dict(self.mappings))))
+
+    def validate(self):
+        utils.validate_dict_values(self.mappings)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.mappings, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts('Substitution:')
+        with context.style.indent:
+            console.puts('Node type: {0}'.format(context.style.type(self.node_type.name)))
+            utils.dump_dict_values(self.mappings, 'Mappings')
+
+    __private_fields__ = ['node_type_fk',
+                          'substitution_template_fk']
+
+
+class SubstitutionMappingBase(InstanceModelMixin):
+    """
+    Used by :class:`Substitution` to map a capability or a requirement to a node.
+
+    Only one of `capability_template` and `requirement_template` can be set.
+
+    Usually an instance of a :class:`SubstitutionTemplate`.
+
+    :ivar name: Exposed capability or requirement name
+    :vartype name: basestring
+    :ivar node: Node
+    :vartype node: :class:`Node`
+    :ivar capability: Capability in the node
+    :vartype capability: :class:`Capability`
+    :ivar requirement_template: Requirement template in the node template
+    :vartype requirement_template: :class:`RequirementTemplate`
+
+    :ivar substitution: Containing substitution
+    :vartype substitution: :class:`Substitution`
+    """
+
+    __tablename__ = 'substitution_mapping'
+
+    @declared_attr
+    def node(cls):
+        return relationships.one_to_one(cls, 'node')
+
+    @declared_attr
+    def capability(cls):
+        return relationships.one_to_one(cls, 'capability')
+
+    @declared_attr
+    def requirement_template(cls):
+        return relationships.one_to_one(cls, 'requirement_template')
+
+    # region foreign keys
+
+    @declared_attr
+    def substitution_fk(cls):
+        """For Substitution one-to-many to SubstitutionMapping"""
+        return relationships.fk('substitution')
+
+    @declared_attr
+    def node_fk(cls):
+        """For Substitution one-to-one to NodeTemplate"""
+        return relationships.fk('node')
+
+    @declared_attr
+    def capability_fk(cls):
+        """For Substitution one-to-one to Capability"""
+        return relationships.fk('capability', nullable=True)
+
+    @declared_attr
+    def requirement_template_fk(cls):
+        """For Substitution one-to-one to RequirementTemplate"""
+        return relationships.fk('requirement_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name)))
+
+    def validate(self):
+        context = ConsumptionContext.get_thread_local()
+        if (self.capability is None) and (self.requirement_template is None):
+            context.validation.report('mapping "{0}" refers to neither capability nor a requirement'
+                                      ' in node: {1}'.format(
+                                          self.name,
+                                          formatting.safe_repr(self.node.name)),
+                                      level=validation.Issue.BETWEEN_TYPES)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts('{0} -> {1}.{2}'.format(
+            context.style.node(self.name),
+            context.style.node(self.node.name),
+            context.style.node(self.capability.name
+                               if self.capability
+                               else self.requirement_template.name)))
+
+    __private_fields__ = ['substitution_fk',
+                          'node_fk',
+                          'capability_fk',
+                          'requirement_template_fk']
+
+
+class RelationshipBase(InstanceModelMixin):
+    """
+    Connects :class:`Node` to a capability in another node.
+
+    Might be an instance of a :class:`RelationshipTemplate`.
+
+    :ivar name: Name (usually the name of the requirement at the source node template)
+    :vartype name: basestring
+    :ivar relationship_template: Template from which this relationship was instantiated (optional)
+    :vartype relationship_template: :class:`RelationshipTemplate`
+    :ivar requirement_template: Template from which this relationship was instantiated (optional)
+    :vartype requirement_template: :class:`RequirementTemplate`
+    :ivar type: Relationship type
+    :vartype type: :class:`Type`
+    :ivar target_capability: Capability at the target node (optional)
+    :vartype target_capability: :class:`Capability`
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+    :ivar interfaces: Bundles of operations
+    :vartype interfaces: {basestring: :class:`Interfaces`}
+
+    :ivar source_position: ??
+    :vartype source_position: int
+    :ivar target_position: ??
+    :vartype target_position: int
+
+    :ivar source_node: Source node
+    :vartype source_node: :class:`Node`
+    :ivar target_node: Target node
+    :vartype target_node: :class:`Node`
+    :ivar tasks: Tasks on this node
+    :vartype tasks: [:class:`Task`]
+    """
+
+    __tablename__ = 'relationship'
+
+    @declared_attr
+    def relationship_template(cls):
+        return relationships.many_to_one(cls, 'relationship_template')
+
+    @declared_attr
+    def requirement_template(cls):
+        return relationships.many_to_one(cls, 'requirement_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    @declared_attr
+    def target_capability(cls):
+        return relationships.one_to_one(cls, 'capability')
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    @declared_attr
+    def interfaces(cls):
+        return relationships.one_to_many(cls, 'interface', dict_key='name')
+
+    # region orchestration
+
+    source_position = Column(Integer) # ???
+    target_position = Column(Integer) # ???
+
+    # endregion
+
+    # region foreign keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Relationship many-to-one to Type"""
+        return relationships.fk('type', nullable=True)
+
+    @declared_attr
+    def source_node_fk(cls):
+        """For Node one-to-many to Relationship"""
+        return relationships.fk('node')
+
+    @declared_attr
+    def target_node_fk(cls):
+        """For Node one-to-many to Relationship"""
+        return relationships.fk('node')
+
+    @declared_attr
+    def target_capability_fk(cls):
+        """For Relationship one-to-one to Capability"""
+        return relationships.fk('capability', nullable=True)
+
+    @declared_attr
+    def requirement_template_fk(cls):
+        """For Relationship many-to-one to RequirementTemplate"""
+        return relationships.fk('requirement_template', nullable=True)
+
+    @declared_attr
+    def relationship_template_fk(cls):
+        """For Relationship many-to-one to RelationshipTemplate"""
+        return relationships.fk('relationship_template', nullable=True)
+
+    # endregion
+
+    # region association proxies
+
+    @declared_attr
+    def source_node_name(cls):
+        """Required for use by SQLAlchemy queries"""
+        return association_proxy('source_node', 'name')
+
+    @declared_attr
+    def target_node_name(cls):
+        """Required for use by SQLAlchemy queries"""
+        return association_proxy('target_node', 'name')
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('target_node_id', self.target_node.name),
+            ('type_name', self.type.name
+             if self.type is not None else None),
+            ('template_name', self.relationship_template.name
+             if self.relationship_template is not None else None),
+            ('properties', formatting.as_raw_dict(self.properties)),
+            ('interfaces', formatting.as_raw_list(self.interfaces))))
+
+    def validate(self):
+        utils.validate_dict_values(self.properties)
+        utils.validate_dict_values(self.interfaces)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.properties, report_issues)
+        utils.coerce_dict_values(container, self.interfaces, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        if self.name:
+            console.puts('{0} ->'.format(context.style.node(self.name)))
+        else:
+            console.puts('->')
+        with context.style.indent:
+            console.puts('Node: {0}'.format(context.style.node(self.target_node.name)))
+            if self.target_capability:
+                console.puts('Capability: {0}'.format(context.style.node(
+                    self.target_capability.name)))
+            if self.type is not None:
+                console.puts('Relationship type: {0}'.format(context.style.type(self.type.name)))
+            if (self.relationship_template is not None) and self.relationship_template.name:
+                console.puts('Relationship template: {0}'.format(
+                    context.style.node(self.relationship_template.name)))
+            utils.dump_dict_values(self.properties, 'Properties')
+            utils.dump_interfaces(self.interfaces, 'Interfaces')
+
+    __private_fields__ = ['type_fk',
+                          'source_node_fk',
+                          'target_node_fk',
+                          'target_capability_fk',
+                          'requirement_template_fk',
+                          'relationship_template_fk',
+                          'source_node_name',
+                          'target_node_name']
+
+
+class CapabilityBase(InstanceModelMixin):
+    """
+    A capability of a :class:`Node`.
+
+    Usually an instance of a :class:`CapabilityTemplate`.
+
+    :ivar name: Name (unique for the node)
+    :vartype name: basestring
+    :ivar capability_template: Template from which this capability was instantiated (optional)
+    :vartype capability_template: :class:`capabilityTemplate`
+    :ivar type: Capability type
+    :vartype type: :class:`Type`
+    :ivar min_occurrences: Minimum number of requirement matches required
+    :vartype min_occurrences: int
+    :ivar max_occurrences: Maximum number of requirement matches allowed
+    :vartype min_occurrences: int
+    :ivar occurrences: Actual number of requirement matches
+    :vartype occurrences: int
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+
+    :ivar node: Containing node
+    :vartype node: :class:`Node`
+    :ivar relationship: Available when we are the target of a relationship
+    :vartype relationship: :class:`Relationship`
+    :ivar substitution_mapping: Our contribution to service substitution
+    :vartype substitution_mapping: :class:`SubstitutionMapping`
+    """
+
+    __tablename__ = 'capability'
+
+    @declared_attr
+    def capability_template(cls):
+        return relationships.many_to_one(cls, 'capability_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    min_occurrences = Column(Integer, default=None)
+    max_occurrences = Column(Integer, default=None)
+    occurrences = Column(Integer, default=0)
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Capability many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def node_fk(cls):
+        """For Node one-to-many to Capability"""
+        return relationships.fk('node')
+
+    @declared_attr
+    def capability_template_fk(cls):
+        """For Capability many-to-one to CapabilityTemplate"""
+        return relationships.fk('capability_template', nullable=True)
+
+    # endregion
+
+    @property
+    def has_enough_relationships(self):
+        if self.min_occurrences is not None:
+            return self.occurrences >= self.min_occurrences
+        return True
+
+    def relate(self):
+        if self.max_occurrences is not None:
+            if self.occurrences == self.max_occurrences:
+                return False
+        self.occurrences += 1
+        return True
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('type_name', self.type.name),
+            ('properties', formatting.as_raw_dict(self.properties))))
+
+    def validate(self):
+        utils.validate_dict_values(self.properties)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.properties, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts(context.style.node(self.name))
+        with context.style.indent:
+            console.puts('Type: {0}'.format(context.style.type(self.type.name)))
+            console.puts('Occurrences: {0:d} ({1:d}{2})'.format(
+                self.occurrences,
+                self.min_occurrences or 0,
+                ' to {0:d}'.format(self.max_occurrences)
+                if self.max_occurrences is not None
+                else ' or more'))
+            utils.dump_dict_values(self.properties, 'Properties')
+
+    __private_fields__ = ['capability_fk',
+                          'node_fk',
+                          'capability_template_fk']
+
+
+class InterfaceBase(InstanceModelMixin):
+    """
+    A typed set of :class:`Operation`.
+
+    Usually an instance of :class:`InterfaceTemplate`.
+
+    :ivar name: Name (unique for the node, group, or relationship)
+    :vartype name: basestring
+    :ivar interface_template: Template from which this interface was instantiated (optional)
+    :vartype interface_template: :class:`InterfaceTemplate`
+    :ivar type: Interface type
+    :vartype type: :class:`Type`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar inputs: Parameters that can be used by all operations in the interface
+    :vartype inputs: {basestring: :class:`Parameter`}
+    :ivar operations: Operations
+    :vartype operations: {basestring: :class:`Operation`}
+
+    :ivar node: Containing node
+    :vartype node: :class:`Node`
+    :ivar group: Containing group
+    :vartype group: :class:`Group`
+    :ivar relationship: Containing relationship
+    :vartype relationship: :class:`Relationship`
+    """
+
+    __tablename__ = 'interface'
+
+    @declared_attr
+    def interface_template(cls):
+        return relationships.many_to_one(cls, 'interface_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    description = Column(Text)
+
+    @declared_attr
+    def inputs(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='inputs', dict_key='name')
+
+    @declared_attr
+    def operations(cls):
+        return relationships.one_to_many(cls, 'operation', dict_key='name')
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Interface many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def node_fk(cls):
+        """For Node one-to-many to Interface"""
+        return relationships.fk('node', nullable=True)
+
+    @declared_attr
+    def group_fk(cls):
+        """For Group one-to-many to Interface"""
+        return relationships.fk('group', nullable=True)
+
+    @declared_attr
+    def relationship_fk(cls):
+        """For Relationship one-to-many to Interface"""
+        return relationships.fk('relationship', nullable=True)
+
+    @declared_attr
+    def interface_template_fk(cls):
+        """For Interface many-to-one to InterfaceTemplate"""
+        return relationships.fk('interface_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('description', self.description),
+            ('type_name', self.type.name),
+            ('inputs', formatting.as_raw_dict(self.inputs)),
+            ('operations', formatting.as_raw_list(self.operations))))
+
+    def validate(self):
+        utils.validate_dict_values(self.inputs)
+        utils.validate_dict_values(self.operations)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.inputs, report_issues)
+        utils.coerce_dict_values(container, self.operations, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts(context.style.node(self.name))
+        if self.description:
+            console.puts(context.style.meta(self.description))
+        with context.style.indent:
+            console.puts('Interface type: {0}'.format(context.style.type(self.type.name)))
+            utils.dump_dict_values(self.inputs, 'Inputs')
+            utils.dump_dict_values(self.operations, 'Operations')
+
+    __private_fields__ = ['type_fk',
+                          'node_fk',
+                          'group_fk',
+                          'relationship_fk',
+                          'interface_template_fk']
+
+
+class OperationBase(InstanceModelMixin):
+    """
+    An operation in a :class:`Interface`.
+
+    Might be an instance of :class:`OperationTemplate`.
+
+    :ivar name: Name (unique for the interface or service)
+    :vartype name: basestring
+    :ivar operation_template: Template from which this operation was instantiated (optional)
+    :vartype operation_template: :class:`OperationTemplate`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar plugin_specification: Associated plugin
+    :vartype plugin_specification: :class:`PluginSpecification`
+    :ivar implementation: Implementation string (interpreted by the plugin)
+    :vartype implementation: basestring
+    :ivar dependencies: Dependency strings (interpreted by the plugin)
+    :vartype dependencies: [basestring]
+    :ivar inputs: Parameters that can be used by this operation
+    :vartype inputs: {basestring: :class:`Parameter`}
+    :ivar executor: Executor name
+    :vartype executor: basestring
+    :ivar max_retries: Maximum number of retries allowed in case of failure
+    :vartype max_retries: int
+    :ivar retry_interval: Interval between retries (in seconds)
+    :vartype retry_interval: int
+
+    :ivar interface: Containing interface
+    :vartype interface: :class:`Interface`
+    :ivar service: Containing service
+    :vartype service: :class:`Service`
+    """
+
+    __tablename__ = 'operation'
+
+    @declared_attr
+    def operation_template(cls):
+        return relationships.many_to_one(cls, 'operation_template')
+
+    description = Column(Text)
+
+    @declared_attr
+    def plugin_specification(cls):
+        return relationships.one_to_one(cls, 'plugin_specification')
+
+    implementation = Column(Text)
+    dependencies = Column(modeling_types.StrictList(item_cls=basestring))
+
+    @declared_attr
+    def inputs(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='inputs', dict_key='name')
+
+    executor = Column(Text)
+    max_retries = Column(Integer)
+    retry_interval = Column(Integer)
+
+    # region foreign_keys
+
+    @declared_attr
+    def service_fk(cls):
+        """For Service one-to-many to Operation"""
+        return relationships.fk('service', nullable=True)
+
+    @declared_attr
+    def interface_fk(cls):
+        """For Interface one-to-many to Operation"""
+        return relationships.fk('interface', nullable=True)
+
+    @declared_attr
+    def plugin_specification_fk(cls):
+        """For Operation one-to-one to PluginSpecification"""
+        return relationships.fk('plugin_specification', nullable=True)
+
+    @declared_attr
+    def operation_template_fk(cls):
+        """For Operation many-to-one to OperationTemplate"""
+        return relationships.fk('operation_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('description', self.description),
+            ('implementation', self.implementation),
+            ('dependencies', self.dependencies),
+            ('executor', self.executor),
+            ('max_retries', self.max_retries),
+            ('retry_interval', self.retry_interval),
+            ('inputs', formatting.as_raw_dict(self.inputs))))
+
+    def validate(self):
+        # TODO must be associated with interface or service
+        utils.validate_dict_values(self.inputs)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.inputs, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts(context.style.node(self.name))
+        if self.description:
+            console.puts(context.style.meta(self.description))
+        with context.style.indent:
+            if self.implementation is not None:
+                console.puts('Implementation: {0}'.format(
+                    context.style.literal(self.implementation)))
+            if self.dependencies:
+                console.puts(
+                    'Dependencies: {0}'.format(
+                        ', '.join((str(context.style.literal(v)) for v in self.dependencies))))
+            if self.executor is not None:
+                console.puts('Executor: {0}'.format(context.style.literal(self.executor)))
+            if self.max_retries is not None:
+                console.puts('Max retries: {0}'.format(context.style.literal(self.max_retries)))
+            if self.retry_interval is not None:
+                console.puts('Retry interval: {0}'.format(
+                    context.style.literal(self.retry_interval)))
+            utils.dump_dict_values(self.inputs, 'Inputs')
+
+    __private_fields__ = ['service_fk',
+                          'interface_fk',
+                          'plugin_fk',
+                          'operation_template_fk']
+
+
+class ArtifactBase(InstanceModelMixin):
+    """
+    A file associated with a :class:`Node`.
+
+    Usually an instance of :class:`ArtifactTemplate`.
+
+    :ivar name: Name (unique for the node)
+    :vartype name: basestring
+    :ivar artifact_template: Template from which this artifact was instantiated (optional)
+    :vartype artifact_template: :class:`ArtifactTemplate`
+    :ivar type: Artifact type
+    :vartype type: :class:`Type`
+    :ivar description: Human-readable description
+    :vartype description: string
+    :ivar source_path: Source path (CSAR or repository)
+    :vartype source_path: basestring
+    :ivar target_path: Path at destination machine
+    :vartype target_path: basestring
+    :ivar repository_url: Repository URL
+    :vartype repository_path: basestring
+    :ivar repository_credential: Credentials for accessing the repository
+    :vartype repository_credential: {basestring: basestring}
+    :ivar properties: Associated parameters
+    :vartype properties: {basestring: :class:`Parameter`}
+
+    :ivar node: Containing node
+    :vartype node: :class:`Node`
+    """
+
+    __tablename__ = 'artifact'
+
+    @declared_attr
+    def artifact_template(cls):
+        return relationships.many_to_one(cls, 'artifact_template')
+
+    @declared_attr
+    def type(cls):
+        return relationships.many_to_one(cls, 'type')
+
+    description = Column(Text)
+    source_path = Column(Text)
+    target_path = Column(Text)
+    repository_url = Column(Text)
+    repository_credential = Column(modeling_types.StrictDict(basestring, basestring))
+
+    @declared_attr
+    def properties(cls):
+        return relationships.many_to_many(cls, 'parameter', prefix='properties', dict_key='name')
+
+    # region foreign_keys
+
+    @declared_attr
+    def type_fk(cls):
+        """For Artifact many-to-one to Type"""
+        return relationships.fk('type')
+
+    @declared_attr
+    def node_fk(cls):
+        """For Node one-to-many to Artifact"""
+        return relationships.fk('node')
+
+    @declared_attr
+    def artifact_template_fk(cls):
+        """For Artifact many-to-one to ArtifactTemplate"""
+        return relationships.fk('artifact_template', nullable=True)
+
+    # endregion
+
+    @property
+    def as_raw(self):
+        return collections.OrderedDict((
+            ('name', self.name),
+            ('description', self.description),
+            ('type_name', self.type.name),
+            ('source_path', self.source_path),
+            ('target_path', self.target_path),
+            ('repository_url', self.repository_url),
+            ('repository_credential', formatting.as_agnostic(self.repository_credential)),
+            ('properties', formatting.as_raw_dict(self.properties))))
+
+    def validate(self):
+        utils.validate_dict_values(self.properties)
+
+    def coerce_values(self, container, report_issues):
+        utils.coerce_dict_values(container, self.properties, report_issues)
+
+    def dump(self):
+        context = ConsumptionContext.get_thread_local()
+        console.puts(context.style.node(self.name))
+        if self.description:
+            console.puts(context.style.meta(self.description))
+        with context.style.indent:
+            console.puts('Artifact type: {0}'.format(context.style.type(self.type.name)))
+            console.puts('Source path: {0}'.format(context.style.literal(self.source_path)))
+            if self.target_path is not None:
+                console.puts('Target path: {0}'.format(context.style.literal(self.target_path)))
+            if self.repository_url is not None:
+                console.puts('Repository URL: {0}'.format(
+                    context.style.literal(self.repository_url)))
+            if self.repository_credential:
+                console.puts('Repository credential: {0}'.format(
+                    context.style.literal(self.repository_credential)))
+            utils.dump_dict_values(self.properties, 'Properties')
+
+    __private_fields__ = ['type_fk',
+                          'node_fk',
+                          'artifact_template_fk']


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