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From Apache Wiki <wikidi...@apache.org>
Subject [Incubator Wiki] Update of "SynapseProposal" by SanjivaWeerawarana
Date Fri, 12 Aug 2005 19:17:29 GMT
Dear Wiki user,

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The following page has been changed by SanjivaWeerawarana:
http://wiki.apache.org/incubator/SynapseProposal

New page:
= PROJECT PROPOSAL =

Synapse: A Web service "Broker" / "ESB" project

Synapse will be a robust, lightweight implementation of a highly scalable and distributed
service broker / ESB based on Web services specifications.

= RATIONALE =

The current Apache Web Services project ([WWW] http://ws.apache.org/) has been tasked to provide
functionality useful in the development of Web services following the set of WS-* specifications.

This proposal is to build a set of components that work together with Axis2 and other Apache
and open source projects to create a flexible transformation, management and routing system.

There are two strong reasons for creating this project in Apache. Firstly, Apache has led
the creation of open source Web services code, and this is a clear logical extension of that
line of work. Secondly, there is an opportunity to help shape the broker/ESB marketplace through
the creation of a high quality, Web services centric (vs. Java-centric) open source implementation
which is developed in a truly open community and which is available under the
favorable terms of the Apache Software License v2.0.

A set of leading vendors in this space are joining together to start this project: BlueTitan,
Infravio, Sonic and WSO2. We expect it to be a major success.

= FEATURES =

This project implements the patterns that are called Enterprise Service Bus or Broker. Since
these are somewhat contentious terms, we define the aims of the Synapse as follows:

 * a messaging and communications infrastructure;
 * based on the principles of service oriented architectures;
 * that provides a way of connecting disparate systems;
 * that manages the connections and the routing of messages between systems;
 * that intermediates and transforms messages and service interactions independently of the
endpoint applications;
 * that is neutral with respect to the languages and platforms that are integrated - providing
first class support for C/C++/COBOL/Java/.NET and other application platforms.

This project will provide an implementation of a distributed services broker based on Web
Services specifications. While it will support connections to external systems, the fundamental
model of this architecture will be based on the core Web Services standards, including SOAP,
WSDL, WS-Addressing, WS-Policy, WS-Security and WS-ReliableMessaging. Where possible this
project will re-use existing Apache implementations of these specifications, as well as the
AXIOM object model from Axis2.

The main aims of the project will be to support the following functions:
 * connectivity
   * dynamic discovery, load-balancing and availability
   * gatewaying and routing of Web services
   * creating static and dynamic links between requesters and providers
   * bridging between SOAP over multiple protocols
   * support for building adapters to existing systems, including JMS and JCA
   * support for adding new transports and protocols
   * support for high-performance Infoset encodings of SOAP

 * transformation and mediation
   * providing a framework for deploying and managing transformation and routing components
   * support for multiple mediation models including XSLT, XPATH,script-based, and Java transformation
components

 * management
   * support for logging, monitoring, tracing, performance measurement, failure detection,
and other management of Web services
   * using WSDM/WS-Management and/or JMX

Initial development will be in Java but in future may include a Apache Synapse/C based on
Apache's C/C++ Web services initiatives.  We expect to support not only Java, but also other
languages on the Java platform such as Groovy, Javascript/E4X, and Jython.

Synapse plans to support the Java Business Integration (JBI) standard, but we plan do so as
an add-on rather than as core APIs.  Synapse is following the same pattern as Axis2 with respect
to new JSRs - we will build the APIs the way we want them and then implement the JSRs with
layers on top (thus also freeing the core project from reliance on TCKs and licensing).

The project will not create a management framework or repository framework but will utilize
and integrate with existing open source projects that offer such functionality.

= INITIAL SOURCE =

Infravio will contribute the core of the source of their X-Broker product (see http://www.infravio.com/products.html#x-broker)
to seed the project. The Infravio X-broker provides a full featured Web services intermediary
offering the following features 

 * Web services Management functionality
   * WS-Security compliant Authenticaton, Encryption and Non-Repudiation
   * Logging and Monitoring framework for performance and reliability
   * Flexible Routing: Content, Context and Logic based
   * Deprecation, Failover and Load Balancing templates

 * Ease of Use
   * Infravio Contract model for flexible configuration
   * Axis-JaxRPC based framework for ease of porting
   * WSDD based deployment model
  
 * Infrastructure
   * JMX based management infrastructure
   * Agent (Co-deploy) and Intermediary (Proxy) model support
   * Ports to BEA Weblogic and IBM Websphere available

The developer community will take that code as input and produce the best possible ESB/broker
product based on the Axis2 core framework which achieves the above objectives as best as possible.

= RESOURCES TO BE CREATED =

 * SVN Repository
 * Jira
 * Mailing Lists
 * Official Build Systems

= AVOIDING THE WARNING SIGNS =

This is a very topical topic in the Web services space and the contributors are leading vendors
in this space (and a startup). There is no risk of any of the usual warning signs of orphaned
or abandoned code.

Most of the current committers have experience working with open source projects and communities
and the leaders of this project are long time ASF contributors and ASF members. We do not
expect any difficulty in executing under normal meritocracy rules.

= COMMITTERS =

 * Sathish Kumar T.K (Infravio)
 * D. Hariharasudan (Infravio)
 * Vikar Roonwal (Infravio)
 * Glen Daniels (Sonic) - Member of ASF, Member of WS PMC and Axis Committer
 * Paul Fremantle (WSO2) - Member of WS PMC and Axis Committer
 * Davanum Srinivas (WSO2) - Member of ASF, WS PMC Chair and Axis Committer
 * Sanjiva Weerawarana (WSO2) - Member of ASF, Member of WS PMC and Axis Committer
 
(More to come from BlueTitan and Sonic)

= PROPOSED APACHE SPONSOR =

The WS PMC has voted to accept this project into the WS project upon successful incubation.

= MENTORS =

Glen Daniels (gdaniels@apache.org)
Davanum Srinivas (dims@apache.org)
Sanjiva Weerawarana (sanjiva@apache.org)

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