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eDocs Home > BEA WebLogic Integration 8.1 Documentation > Solution Samples >Sync to Async Sample

Sync to Async Sample

This sample illustrates a scalable solution to the problem of enabling an asynchronous business process to support invocation by a client that does not support asynchrony (callbacks). This design pattern is appropriate when application architecture requires synchronous invocation of an asynchronous process. In this pattern a synchronous (blocking) client must invoke an asynchronous business process while waiting for the process to return information.

Note: This sample is provided on dev2dev for your convenience and is not supported by BEA.

What the Sample Does

The sample consists of a single WebLogic Integration application containing one asynchronous business process (a JPD) and associated artifacts (SyncAsync WSDL, Web Service Control, and Schema), plus a Page Flow client. The client invokes the JPD, the JPD executes simple asynchronous activity using a Timer Control and generates an XML document with a unique timestamp. The JPD then returns an XML document to the client using XMLBean functionality. The client displays the returned XML document.

How It Works

The key to the operation of the sample is the design-time configuration of the business process that enables synchronous clients to communicate with it. This configuration, coupled with the run-time functionality of the "sync to async" servlet shipped with BEA WebLogic Integration 8.1 Service Pack 4, enables this design pattern to function. It is important to note that the JPD configuration process is the same whether it is stateless or stateful and remains the same regardless of the synchronous client implementation.

The following diagram illustrates the sample architecture:

Sync to Async Sample

Required Software

This sample requires the following software:

  • WebLogic Integration 8.1, SP4 or later (includes Jython 2.1). You can download WebLogic Integration 8.1 from the download page on dev2dev.
  • WLI Common Utilities, version 2.5. You can download WLI Common Utilities from the download page.
  • WebLogic Server Scripting Tool (WLST) (included with WLI Common Utilities). You can also download WLST from the download page.
  • Note: WLST Offline and WLST Online are available for download and evaluation from BEA's dev2dev site, but have not been formally included in the WebLogic Platform 8.1 product. WLST is supported through BEA newsgroups only, and the utility and APIs are subject to change. BEA intends to formally support this capability in a future release of WebLogic Platform.

Supporting Materials

In addition to providing application code, the sample includes the following items:

  • Instructions and scripts for generating a java client using clientGen.
  • Instructions and scripts for configuring a BEA WebLogic Integration cluster to support the application.
  • Instructions and scripts for deploying the application to an appropriately configured cluster.
  • Instructions, guidelines, and caveats for designing asynchronous processes that will participate in synchronous client interactions.

How to Download

You can download the Sync to Async sample and WLI Common Utilities from the download page on dev2dev.