Need help for synchronization in a clustered environment.

[wazzeledozzle]

Hi,

Need help for synchronization in a clustered environment.
Please give me some tutorials or article link. My environment contains three Tomcat server with SQL.

Thanks in advance.

[Xeusion]

Synchronization is a process of controlling the access of shared resources by the multiple threads in such a manner that only one thread can access one resource at a time. In non synchronized multithreaded application, it is possible for one thread to modify a shared object while another thread is in the process of using or updating the object's value. Synchronization prevents such type of data corruption.

E.g. Synchronizing a function:
public synchronized void Method1 () {
// Appropriate method-related code.
}

E.g. Synchronizing a block of code inside a function:
public myFunction (){
synchronized (this) {
// Synchronized code here.
}
}

[Jkbaseball]

SYSTEM SYNCHRONIZATION IN CLUSTER

A machine, cluster, computer program product and method for choosing an attribute, based on an occurrence of a predetermined event, to be used in a machine of a cluster that includes plural machines. The method includes storing a runtime variable and a configuration variable for each machine of the cluster, selecting, upon the occurrence of the predetermined event, an attribute from a first list of at least one attribute included in the runtime variable in the cluster, accessing, if the runtime variable is not available, the configuration variable, where the configuration variable includes a second list of at least one attribute and selecting an attribute from the second list, and using the selected attribute in the machine.

[Darth]

Installing a Synchronization Server cluster

A cluster is a set of application servers that are managed together and participate in workload management. In a distributed environment, you can cluster the Synchronization Server component. Each Synchronization Server is installed on a separate node and managed by Network Deployment. Cluster members have identical application components, but can be sized differently in terms of weight, heap size, and other environmental factors. The weighted load balancing policies are defined and controlled by the web server plug-in. Starting or stopping the cluster automatically starts or stops all the cluster members, and changes to the application are propagated to all Synchronization Server instances in the cluster. The servers share the same database and possibly the same WebSphere Portal Server. (WebSphere Portal and the Synchronization Server portlets can also be clustered.