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Articles : J2EE Deployment Specification :

Deployment Target:


A deployment target is a server or a clustered group of servers where in the J2EE application is to be deployed and configured. The J2EE application needs to be stored on the server and this could be a directory or a database repository depending on the type of application server and the storage system it has. The configuration of the server is the responsibility of the J2EE product provider. The provider also has the responsibility of making sure the target is capable of deploying J2EE applications by the deployer. The deployer or the tool provider need not bother about the configuration. The J2EE provider needs to provide at least one target per J2EE product and has to make the information about the target available to the deployment manager. The deployer will deploy and distribute the J2EE application to all targets as dictated in the deployment descriptor.

TargetModuleID:


When a J2EE application is deployed on a target the target server generates a TargetModuleId object for each module in the application. The TargetModuleID object contains a unique target ID identifier which identifies each module in the application server. The ID is unique across the application server and remains with the module all through its lifetime on the server. The object also contains information on the target on which the module is deployed. The target module ID information is accessible to the deployment manager. This way the deployer can access information on modules through the deployment manager and do operations like starting a module, stopping a module or undeploying a module.

The TargetModuleID also maintains references to its parent modules and its child modules. In case the module happens to be the root of the deployed application its parent TargetModuleID is null. Other API methods of the TargetModuleID class can help retrieve the module ID, parent module object, child module objects, targets, etc.

ProgressObject:


A ProgressObject class is provider to the tool provider to poll the status and provide callback information on deployment operations. It tracks and reports the progress of deployment operations like start, stop, deploy undeploy etc. It also provides methods to stop or start a deployment operation midway. If a request for stop is issued to the target it finishes the currently running target module but halts the processing of subsequent modules. A J2EE provider may provide an optional cancel method which will cancel the requested operation. The cancel operation will cancel all operations and return the system to the same state it was before it started the operation. A ClientConfiguration object is returned by the progress object for every application client distributed on the J2EE product. This object helps in installing, configuring and running an application client.

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