Reliable Asynchronous Web Services on Java EE JOnAS server and Apache CXF

Reliable asynchronous web-serviceswith Apache CXFFlorent Benoit, BULL/OW2 [ @florentbenoit ]Guy Vachet, France Telecom [guy.vachet@orange-ftgroup.com]New CXF transport allowing reliable Web Services based on JMStransport and JTA transaction. OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #1

Context / History OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #2

France Telecom Orange context● Large heterogeneous IS ● Over 3000 interconnected applications ● Since 2006, generalized web services usage with SOAP over HTTP, in order to: – standardize exchanges between applications – create facades between the front end and the legacy back-office● SOAP over HTTP drawbacks ● Tightly-coupled transport ● Services inaccessible when the provider is inactive ● Difficulty to analyze failures (404-type errors) ● Long-lasting back office operations unadapted to real-time front-end interactions: we need asynchronism! OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #3

SOAP over JMS proposal● Objectives ● Real asynchronous client-server exchange ● Guarantee the reliability of message delivery (no message loss, no duplicate) ● JTA Transactional features – client-side: between its resources and the message sent – server-side: between message reading and its resources – similarly for responses● Technical context ● WSDL first ● Based on CXF2.1 ● Standard Java EE context: JOnAS (Java EE) and JORAM (JMS) OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #4

Limitations of the async. CXF proposal● Current proposal on Apache side for asynchronous transport seems to present some limitations: ● One thread per request – scalability? ● Memory-based mechanism – recovery after crash? ● No transaction support – message sending/receiving● Our objective: define an alternative solution ● respecting our objectives and context ● to be integrated smoothly in CXF OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #5

A new proposalOW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #6

Content of the new Proposal● Based on Apache CXF● Use benefits of EJB Message Driven Bean instead of simple « JMS Message Listener» ● JTA Transaction support (Java EE standard) ● Use of a pool of objects for handling requests● New CXF Transport: named MDB (url = mdb://) ● Based on some parts of the CXF/JMS library (used for some functions like building a JMS message from a CXF message)● 3 parts ● Client: sending and receiving ● Server: endpoint OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #7

Global architecture view OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #8

Handling errors [1/2] OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. #9

Handling errors [2/2]● If there is a failure when a Message Driven Bean is handling a JMS message, new attempts to redeliver the message will occur (one retry for each failure as per JMS specification) ● For each failure: –Transaction rollback ● All database operations (or involving other XA resources) are canceled ● Upon reaching a specified number of repetitive failures: → Sending the fault message to a « Dead Message Queue »● JMS Persistent messages ● When we restart servers, all persisted messages will be delivered – No message loss OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 10

Prerequisites● Java EE server: (Tested with JOnAS 5.2.0 M3) ● Java EE 5 application server with EJB 3.1 Singleton bean support ● Java EE 6 App server● JMS server (Tested with JOnAS/JORAM)● Spring is used for the Transport configuration ● Spring already used by CXF OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 11

Availability [1/2]● Code hosted on OW2 JOnAS forge ● JOnAS subproject: – Own life-cycle following CXF releases ● Module available through the OW2 maven repository (and Maven Central repository)● Metrics ● 2 interfaces (AsyncHandler and ContextInfo) ● 10 new classes ● ≈ 1500 Lines of code (without examples / tests) OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 12

Availability [2/2]● Easy to plug: → Add a new MDB CXF transport = Adding MDB transport jar as library in the class-path● Integrated with: ● CXF 2.2.x (2.2.11) ● CXF 2.3.x (2.3.0)● Available by default on JOnAS application server (nothing to do) → JOnAS 5.2.0 M4 SNAPSHOT● Wish to contribute back this transport to the Apache CXF community OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 13

DemoOW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 14

Demo use-case [1/2] OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 15

Demo use-case [2/2]● One server with JMS ● JOnAS hosting all JMS Queues (« endpoint » queue and «client answer» queue● JMS server used is JORAM● 3 JOnAS servers – JOnAS 1: Sending messages from a client – JOnAS 2: WS Endpoint – JOnAS 3: Handling response on the client side● Crash recovery demo for servers JOnAS2 and JOnAS3 OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 16

ConclusionOW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 17

Conclusion● France Telecom Orange started to use this transport. ● Some projects are experimenting this.● Global idea is to contribute back this MDB protocol to Apache CXF community● Available on http://wiki.jonas.ow2.org/xwiki/bin/view/Main/MDB_Transport_CXF OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 18

Q&AFlorent Benoit, BULL/OW2 [ @florentbenoit ]Guy Vachet, France Telecom OW2 Annual Conference 2010, November 24-25, La Cantine, Paris. www.ow2.org. # 19

Reliable Asynchronous Web Services on Java EE JOnAS server and Apache CXF

by Florent BENOIT on Nov 26, 2010

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Reliable Asynchronous Web Services on Java EE JOnAS server and Apache CXF — Presentation Transcript