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Writing Customized Load Balancing Algorithm

In a cluster environment, JReport Server provides a load balancing mechanism which enables the server to work more effectively. However, you can also write your own load balancing algorithm based on the API included in JReport Server. Note that if you create a load balancing algorithm with the API, it will take effect in place of other built-in load balance algorithms you have set.

A demo DemoLoadBalancer.java has been provided to illustrate how to customize load balancing using APIs. You can find it in <install_root>\help\samples\APICluster.

Assuming that you have several clustered servers, take the following steps:

1. Compile DemoLoadBalancer.java to generate the class file as follows (when compiling DemoLoadBalancer.java, you need to add JRESServlets.jar to the class path):
   

   javac -classpath <install_root>\lib\JRESServlets.jar DemoLoadBalancer.java

2. Add DemoLoadBalancer.class to the class path of setenv.bat in the ADDCLASSPATH variable.
3. Add the parameter -Dloadbalance.custom_class=DemoLoadBalancer to the server's startup file JRServer.bat which locates in <install_root>\bin. For example:

   "%JAVAHOME%\bin\java.exe" -Dloadbalance.custom_class=DemoLoadBalancer "-Dinstall.root=%REPORTHOME%" ...

4. Launch JRServer.bat, the customized loadbalancer DemoLoadBalancer will then be applied.
5. Submit some tasks for running. You will now find that these tasks are allocated to the clustered servers based on the DemoLoadBalancer code.

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