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From conflue...@apache.org
Subject [CONF] Apache Jackrabbit: Jackrabbit Configuration (page edited)
Date Fri, 12 Dec 2008 13:26:00 GMT
Jackrabbit Configuration (JCR) edited by Jukka Zitting
      Page: http://cwiki.apache.org/confluence/display/JCR/Jackrabbit+Configuration
   Changes: http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=75311&originalVersion=17&revisedVersion=18

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{toc:minLevel=2}

Apache Jackrabbit needs two pieces of information to set up a runtime content repository instance:

* *Repository home directory* The filesystem path of the directory containing the content
repository accessed by the runtime instance of Jackrabbit. This directory usually contains
all the repository content, search indexes, internal configuration, and other persistent information
managed within the content repository. Note that this is not absolutely required and some
persistence managers and other Jackrabbit components may well be configured to access files
and even other resources (like remote databases) outside the repository home directory. A
designated repository home directory is however always needed even if some components choose
to not use it. Jackrabbit will automatically fill in the repository home directory with all
the required files and subdirectories when the repository is first instantiated.

* *Repository configuration file* The filesystem path of the repository configuration XML
file. This file specifies the class names and properties of the various Jackrabbit components
used to manage and access the content repository. Jackrabbit parses this configuration file
and instantiates the specified components when the runtime content repository instance is
created.

These two configuration parameters are passed either directly to Jackrabbit when creating
a repository instance or indirectly through settings for a JNDI object factory or some other
component management system.

For each workspace that was created, there will also be a workspace.xml file created inside
the workspace home directory that will be used for the workspace - these files have to be
changed, too, because the workspace-specific configuration inside repository.xml is only used
as a template for new workspaces, ie. if you use the createWorkspace of the Jackrabbit API,
the workspace.xml is just a copy of the Workspace element inside repository.xml. You can also
manually create the workspace folder with a workspace.xml file to create a new workspace yourself
(Note that depending on the persistence manager you will also have to setup a database and
configure the access to it).

h2. Repository configuration

The repository configuration file, typically called {{repository.xml}}, specifies global options
like security, versioning and clustering settings. A default workspace configuration template
is also included in the repository configuration file. The exact format of this XML configuration
file is defined in the following document type definition (DTD) files published by the Apache
Jackrabbit project.

   * [-//The Apache Software Foundation//DTD Jackrabbit 1.5//EN|http://jackrabbit.apache.org/dtd/repository-1.5.dtd]
   * [-//The Apache Software Foundation//DTD Jackrabbit 1.4//EN|http://jackrabbit.apache.org/dtd/repository-1.4.dtd]
   * [-//The Apache Software Foundation//DTD Jackrabbit 1.2//EN|http://jackrabbit.apache.org/dtd/repository-1.2.dtd]
   * [-//The Apache Software Foundation//DTD Jackrabbit 1.0//EN|http://jackrabbit.apache.org/dtd/repository-1.0.dtd]

All Jackrabbit 1.x versions are fully backwards compatible, so you can use a recent Jackrabbit
version without having to modify your existing repository configuration. Of course you will
need to make configuration changes if you want to enable new features like the data store
introduced in Jackrabbit 1.4.

The top-level structure of the repository configuration file is shown below. The {{<!DOCTYPE>}}
declaration is optional, but if you include it Jackrabbit 1.5 will use XML validation to make
sure that the configuration file is correctly formatted.

{code:xml}
<!DOCTYPE Repository
          PUBLIC "-//The Apache Software Foundation//DTD Jackrabbit 1.5//EN"
          "http://jackrabbit.apache.org/dtd/repository-1.5.dtd">
<Repository>
  <FileSystem .../>
  <Security .../>
  <Workspaces .../>
  <Workspace .../>
  <Versioning .../>
  <SearchIndex .../>    <!-- optional -->
  <Cluster .../>        <!-- optional, available since 1.2 -->
  <DataStore .../>      <!-- optional, available since 1.4 -->
</Repository>
{code}

Starting with Jackrabbit 1.5, the order of the configuration elements below {{<Repository/>}}
is no fixed.

The repository configuration elements are:

   * {{[FileSystem|#File system configuration]}}: The virtual file system used by the repository
to store things like registered namespaces and node types.
   * {{[Security|#Security configuration]}}: Authentication and authorization configuration.
   * {{[Workspaces|#Workspace configuration]}}: Configuration on where and how workspaces
are managed.
   * {{[Workspace|#Workspace configuration]}}: Default workspace configuration template.
   * {{[Versioning|#Versioning configuration]}}:  Configuration of the repository-wide version
store.
   * {{[SearchIndex|#Search configuration]}}: Configuration of the search index that covers
the repository-wide {{/jcr:system}} content tree. 
   * {{[Cluster|#Cluster configuration]}}: Clustering configuration.
   * {{[DataStore|#Data store configuration]}}: Data store configuration.

See the Jackrabbit 1.5 [default configuration|^repository.xml], for an example repository
configuration file.

{tip}
It is a good idea to place the {{repository.xml}} file _inside_ the repository home directory.
This your repository and its configuration is nicely contained within a single directory tree.
{tip} 

h3. Bean configuration elements

Most of the entries in the configuration file are based on the following generic JavaBean
configuration pattern. Such configuration specifies that the repository should use an instance
of the specified class with the specified properties for the named functionality.

{code:xml}
<ConfigurationElement class="fully.qualified.ClassName">
  <param name="property1" value="...">
  <param name="property2" value="...">
<ConfigurationElement>
{code}

h3. Configuration variables

Jackrabbit supports configuration variables of the form _$\{name\}_. These variables can be
used to avoid hardcoding specific options in the configuration files. The following variables
are available in all Jackrabbit versions:

* {{$\{rep.home\}:}} Repository home directory.
* {{$\{wsp.name\}:}} Workspace name. Only available in workspace configuration.
* {{$\{wsp.home\}:}} Workspace home directory. Only available in workspace configuration.

Since Jackrabbit 1.4 (see [JCR-1304|https://issues.apache.org/jira/browse/JCR-1304]) it has
been possible to use system properties or any application-specific settings as configuration
variables.

h2. Security configuration

The security configuration element is used to specify authentication and authorization settings
for the repository. The structure of the security configuration element is:

{code:xml}
<Security appName="Jackrabbit">
  <SecurityManager .../> <!-- optional, available since 1.5 -->
  <AccessManager .../>   <!-- mandatory until 1.4, optional since 1.5 -->
  <LoginModule .../>     <!-- optional -->
</Security>
{code}

By default Jackrabbit uses the [Java Authentication and Authorization Service|http://java.sun.com/j2se/1.4.2/docs/guide/security/jaas/JAASRefGuide.html]
(JAAS) to authenticate users who try to access the repository. The {{appName}} parameter in
the {{<Security/>}} element is used as the JAAS application name of the repository.

If JAAS authentication is not available or (as is often the case) too complex to set up, Jackrabbit
allows you to specify a repository-specific JAAS [LoginModule|http://java.sun.com/j2se/1.4.2/docs/api/javax/security/auth/spi/LoginModule.html]
that is then used for authenticating repository users. The default [SimpleLoginModule|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/security/SimpleLoginModule.html]
class included in Jackrabbit implements a trivially simple authentication mechanism that accepts
any username and any password as valid authentication credentials.

Once a user has been authenticated, Jackrabbit will use the configured [AccessManager|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/security/AccessManager.html]
to control what parts of the repository content the user is allowed to access and modify.
The default [SimpleAccessManager|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/security/SimpleAccessManager.html]
class included in Jackrabbit implements a trivially simple authorization mechanism that grants
full read access to all users and write access to everyone except anonymous users.

The slightly more advanced [SimpleJBossAccessManager|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/security/SimpleJBossAccessManager.html]
class was added in Jackrabbit 1.3 (see [JCR-650|https://issues.apache.org/jira/browse/JCR-650]).
This class is designed for use with the [JBoss Application Server|http://www.jboss.org/jbossas/],
where it maps JBoss roles to Jackrabbit permissions.

h2. Workspace configuration

A Jackrabbit repository contains one or more workspaces that are each configured in a separate
{{workspace.xml}} configuration file. The {{Workspaces}} element of the repository configuration
specifies where and how the workspaces are managed. The repository configuration also contains
a default workspace configuration template that is used to create the {{workspace.xml}} file
of a new workspace unless more specific configuration is given when the workspace is created.
See the {{createWorkspace}} methods in the [JackrabbitWorkspace|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/api/JackrabbitWorkspace.html]
interface for more details on workspace creating workspaces.

The workspace settings in the repository configuration file are:

{code:xml}
<Workspaces rootPath="${rep.home}/workspaces"
            defaultWorkspace="default"
            configRootPath="..."  <!-- optional -->
            maxIdleTime="..."/>   <!-- optional -->

<Workspace .../>   <!-- default workspace configuration template -->
{code}

The following global workspace configuration options are specified in the {{Workspaces}} element:

   * {{rootPath}}: The native file system directory for workspaces. A subdirectory is automatically
created for each workspace, and the path of that subdirectory can be used in the workspace
configuration as the {{$\{wsp.path\} }}variable.
   * {{defaultWorkspace}}: Name of the default workspace. This workspace is automatically
created when the repository is first started.
   * {{configRootPath}}: By default the configuration of each workspace is stored in a {{workspace.xml}}
file within the workspace directory within the {{rootPath}} directory. If this option is specified,
then the workspace configuration files are stored within the specified path in the virtual
file system (see above) configured for the repository.
   * {{maxIdleTime}}: By default Jackrabbit only releases resources associated with an opened
workspace when the entire repository is closed. This option, if specified, sets the maximum
number of seconds that a workspace can remain unused before the workspace is automatically
closed.

The workspace configuration template and all {{workspace.xml}} configuration files have the
following structure:

{code:xml}
<Workspace name="${wsp.name}">
  <FileSystem .../>
  <PersistenceManager .../>
  <SearchIndex .../>          <!-- optional -->
  <ISMLocking .../>           <!-- optional, available since 1.4 -->
</Workspace>
{code}

The workspace configuration elements are:

   * {{[FileSystem|#File system configuration]}}: The virtual file system passed to the persistence
manager and search index.
   * {{[PersistenceManager|#Persistence configuration]}}: Persistence configuration for workspace
content.
   * {{[SearchIndex|#Search configuration]}}: Configuration of the workspace search index.
   * {{[ISMLocking|#Item state locking configuration]}}: Locking configuration for concurrent
access to workspace content.

{note}
To modify the configuration of an existing workspace, you need to change the {{workspace.xml}}
file of that workspace. Changing the {{<Workspace/>}} element in the repository configuration
file will not affect existing workspaces.
{note}

h2. Versioning configuration

The version histories of all versionable nodes are stored in a repository-wide version store
configured in the {{Versioning}} element of the repository configuration. The versioning configuration
is much like workspace configuration as they are both used by Jackrabbit for storing content.
The main difference between versioning and workspace configuration is that no search index
is specified for the version store as version histories are indexed and searched using the
repository-wide search index. Another difference is that there are no {{$\{wsp.name\} }}or
{{$\{wsp.path\} }}variables for the versioning configuration. Instead the native file system
path of the version store is explicitly specified in the configuration.

The structure of the versioning configuration is:

{code:xml}
<Versioning rootPath="${rep.home}/version">
  <FileSystem .../>
  <PersistenceManager .../>
  <ISMLocking .../>           <!-- optional, available since 1.4 -->
</Versioning>
{code}

The versioning configuration elements are:

   * {{[FileSystem|#File system configuration]}}: The virtual file system passed to the persistence
manager.
   * {{[PersistenceManager|#Persistence configuration]}}: Persistence configuration for the
version store.
   * {{[ISMLocking|#Item state locking configuration]}}: Locking configuration for concurrent
access to workspace content.

h2. Search configuration

See the [Search|http://wiki.apache.org/jackrabbit/Search] page on the Jackrabbit wiki.

h2. File system configuration

Early versions on Jackrabbit were designed to abstract their persistence mechanism using a
virtual file system layer defined in the [FileSystem|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/fs/FileSystem.html]
interface. This low-level approach didn't work that well in practice, and so most of the persistence
abstraction is now handled in a higher level. However, certain parts of Jackrabbit still use
this file system abstraction.

A virtual file system is configured in a {{<FileSystem/>}} bean configuration element.
See the main file system implementations [LocalFileSystem|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/fs/local/LocalFileSystem.html],
[DatabaseFileSystem|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/fs/db/DatabaseFileSystem.html]
(including subclasses), and [MemoryFileSystem|http://jackrabbit.apache.org/api/1.5/org/apache/jackrabbit/core/fs/mem/MemoryFileSystem.html]
for the available options. The recommended alternative is to use the LocalFileSystem implementation
that simply maps abstract file system accesses to the specified directory within the native
file system.

h2. Cluster configuration

See the [Clustering|http://wiki.apache.org/jackrabbit/Clustering] page on the Jackrabbit wiki.

h2. Data store configuration

See the [DataStore|http://wiki.apache.org/jackrabbit/DataStore] page on the Jackrabbit wiki.

h2.Item state locking configuration

TODO


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