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Java Connector Architecture
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server more control over the work that a resource adapter performs. If the resource adapter is in the middle of a long, complicated operation when the application server is shutting down, then the server doesn t need to wait for the resource adapter to finish or pull the rug out from under its feet. Instead, the server can signal to the resource adapter by calling the release() method on the Work object. The resource adapter should then complete processing as quickly as possible. Also the startWork() and scheduleWork() methods on WorkManager let a resource adapter process work asynchronously while still keeping the application server in control. The startWork() method waits until the piece of work has started to execute but not until it completes. This method can therefore be used by a caller that needs to know that the work will be performed but does not need to wait until it has finished. The scheduleWork() method returns as soon as the work has been accepted for processing. In this case, there are no guarantees that work will actually be performed. The Message Inflow contract provides the ability for the resource adapter to respond to calls made by the application server to activate and deactivate message endpoints. The endpointActivation() method in the ResourceAdapter interface is called to do the necessary setup for message delivery to the message endpoint. The endpointDeactivation() method of ResourceAdapter is called when a message endpoint is no longer needed, i.e., this stops the resource adapter from delivering messages. A MessageEndpointFactory object in the javax.resource .spi.endpoint package is passed in to the endpointActivation() method. The object is used by the resource adapter to create message endpoints. Any information about these endpoints should be removed from the resource adapter when the endpointDeactivation() method is called. The getXAResources() method of ResourceAdapter retrieves transaction resources in the event of a system failure. The endpointActivation(), endpointDeactivation(), and getXAResources() methods are mandatory. Here is an example implementation of the ResourceAdapter interface that illustrates the life cycle management and work management contracts:
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public interface BootstrapContext {
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WorkManager getWorkManager(); XATerminator getXATerminator(); Timer createTimer() throws UnavailableException; }
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public class UcnyResourceAdapterImpl implements ResourceAdapter { public static final long TIMEOUT_FIVE_SECONDS = 5000L;
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Note if the application server is particularly busy, it might defer the start of this piece of work. You can use the second startTimeout parameter to specify how long the resource adapter is prepared to wait for the work to start. If the application server fails to start the work within this time then, again, a WorkRejectedException is thrown.
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public UcnyResourceAdapterImpl() { }
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public void start(BootstrapContext ctx)
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Notice that there is an object passed in with the start() method that implements the BootstrapContext interface. This object allows the EIS to pass transaction information to the application server, as well as the ability to pass work to the application server.
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throws ResourceAdapterInternalException {
WorkManager workManager = ctx.getWorkManager(); Work UcnyWorkJob = new UcnyWorkImpl(); WorkListener workListener = new UcnyWorkListenerImpl();
try {
With the xWork methods, the resource adapter can optionally pass a listener that will be notified as the item of work passes through the states of accepted, started, and completed or, in the failure case, rejected.
workManager.startWork (UcnyWorkJob, TIMEOUT_FIVE_SECONDS, new ExecutionContext(), workListener);
Java Connector Architecture
Also, it is possible to have the piece of work executed in the context of a transaction imported by the resource adapter, rather than the context associated with the current thread. The third parameter is an optional ExecutionContext.
} catch (WorkException e) { // } } Handle the exception
public void stop() { // } PERFORM HOUSKEEPING AND FINISH
} public class UcnyWorkJob implements Work {
void run() { // HERE IS WHERE THE WORK ACTUALLY TAKES PLACE } }
void release() { WHEN WE FINISH THE WORK WE RELEASE THE RESOURCES } }
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