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Weblogic thread pooling

1. Introduction

Thread pooling refers to a technique where a pool of worker threads are created and managed by the

application. When a new job arrives, instead of creating a new thread to service it, it's queued by the thread-

pool manager and dispatched later to one of the available worker threads. The thread-pool manager manages

the number of active worker threads based on available resources as well as load considerations, adding new

threads to the pool or freeing some worker threads in response to the number of outstanding requests. The

primary goals of thread pooling are managing the number of active threads in the system and reducing the

overhead of creating new threads by reusing threads from a pool. Please click on the below link to know more

about thread pooling.

http://java.sys-con.com/node/37241

2. Thread pool types

There are two ways of implementing thread pool for the web components like JSP, Servlet etc. and its

associated classes develop your own thread pool library or leverage out of the box support from application

servers like weblogic. Creating your own work managers, work queues, work listeners, work and itssynchronizations are so difficult and time consuming. This document outlines how a thread pool can be

configured in weblogic and uses it in the programs.

3. Weblogic Configurations

As the first step, follow the below steps to configure the thread pool in weblogic which includes specifying the

minimum thread count, maximum thread count etc. Screenshots are provided for each step for easy

understanding

1) Log into weblogic admin console

2) Expand Environment from the left menu as in the below screenshot

http://java.sys-con.com/node/37241http://java.sys-con.com/node/37241http://java.sys-con.com/node/37241

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3) Click on Work Managers link

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4) Click on Lock & Edit button from the left menu

5) Click on New button

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6) Click on Next button

7) Enterthe name for your work manager (eg: TestWorkManager) and click on Next button

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8) Select the weblogic instance/cluster where your application runs and click Finish

9) Click on Activate Changes from the left top menu.

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10) Click on the work manager which is newly created

11) You may configure minimum thread count, maximum thread count; total number of requests can be queued

etc. here.

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4. Web.xml changes

Next step is to specify the thread pool as a resource in the web.xml file as below. Its important to note that the

work manager name and should match.

wm/TestWorkManager

commonj.work.WorkManager

Container

Shareable

5. Use thread pool in the program

Now that you have a thread pool configured in weblogic and can be used in the programs. Next step is to write

a class which implements commonj.work.Work interface. The business logic should go inside run() method as

shown below. An instance of this class represents a Work/Job/Task. In the below example, one instance of

MyWork class can print the numbers in the provided color (eg-green)

class MyWork implements Work{PrintWriter pw;

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String fontcolor;int count;public MyWork(PrintWriter pw, String fontcolor, int count){

this.pw=pw;this.fontcolor = fontcolor;this.count= count;

}public void run() {

for(int i=0;i

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workItemList.add(workItem1);

workItemList.add(workItem2);

//Wai t th e main th read to fin is h al l th e th read s

boolean finshed = workManager.waitForAll(workItemList, WorkManager.INDEFINITE);

out.println("" +finshed + "");

%>

6. Resultant screen

Note- The above configurations and program have been tested in weblogic 10.0.1 version. It should work

similarly in other versions from 9.2 without any changes as per Oracle Inc.