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package javax.resource.spi;
import javax.resource.ResourceException;
import javax.resource.NotSupportedException;
import javax.resource.spi.ActivationSpec;
import javax.resource.spi.endpoint.MessageEndpointFactory;
import javax.transaction.xa.XAResource;
/**
* This represents a resource adapter instance and contains operations for
* lifecycle management and message endpoint setup. A concrete implementation
* of this interface is required to be a JavaBean.
*
* @version 1.0
* @author Ram Jeyaraman
*/
public interface ResourceAdapter {
// lifecycle operations
/**
* This is called when a resource adapter instance is bootstrapped. This
* may be during resource adapter deployment or application server startup.
* This is a startup notification from the application server, and this
* method is called by an application server thread. The application server
* thread executes in an unspecified context.
*
* <p>During this method call a ResourceAdapter JavaBean is
* responsible for initializing the resource adapter
* instance. Any exception thrown during this method
* call causes the application server to abort the bootstrap procedure
* for this specific resource adapter instance.
*
* @param ctx a bootstrap context containing references to
* useful facilities that could be used by a resource adapter instance.
*
* @throws ResourceAdapterInternalException indicates bootstrap failure.
* The resource adapter instance is unusable and must be discarded.
*/
void start(BootstrapContext ctx) throws ResourceAdapterInternalException;
/**
* This is called when a resource adapter instance is undeployed or
* during application server shutdown. This is a shutdown notification
* from the application server, and this method is called by an
* application server thread. The application server
* thread executes in an unspecified context.
*
* <p>During this method call, a ResourceAdapter
* JavaBean is responsible for performing an orderly shutdown of the
* resource adapter instance. Any exception thrown by this
* method call does not alter the
* processing of the application server shutdown or resource
* adapter undeployment that caused this method call. The application
* server may log the exception information for error reporting purposes.
*/
void stop();
// message endpoint setup operations
/**
* This is called during the activation of a message endpoint. This causes
* the resource adapter instance to do the necessary setup (ie., setup
* message delivery for the message endpoint with a message provider).
* Note that message delivery to the message endpoint might start even
* before this method returns.
*
* <p>Endpoint activation is deemed successful only when this method
* completes successfully without throwing any exceptions.
*
* @param endpointFactory a message endpoint factory instance.
*
* @param spec an activation spec JavaBean instance.
*
* @throws NotSupportedException indicates message endpoint
* activation rejection due to incorrect activation
* setup information.
*/
void endpointActivation(MessageEndpointFactory endpointFactory,
ActivationSpec spec) throws ResourceException;
/**
* This is called when a message endpoint is deactivated. The instances
* passed as arguments to this method call should be identical to those
* passed in for the corresponding </code>endpointActivation</code> call.
* This causes the resource adapter to stop delivering messages to the
* message endpoint.
*
* <p>Any exception thrown by this method is ignored. After
* this method call, the endpoint is deemed inactive.
*
* @param endpointFactory a message endpoint factory instance.
*
* @param spec an activation spec JavaBean instance.
*/
void endpointDeactivation(MessageEndpointFactory endpointFactory,
ActivationSpec spec);
/**
* This method is called by the application server during crash recovery.
* This method takes in an array of <code>ActivationSpec</code> JavaBeans
* and returns an array of <code>XAResource</code> objects each of which
* represents a unique resource manager.
*
* The resource adapter may return null if it does not implement the
* <code>XAResource</code> interface. Otherwise, it must return an array
* of <code>XAResource</code> objects, each of which represents a unique
* resource manager that was used by the endpoint applications.
*
* The application server uses the <code>XAResource</code> objects to
* query each resource manager for a list of in-doubt transactions.
* It then completes each pending transaction by sending the commit
* decision to the participating resource managers.
*
* @param specs an array of <code>ActivationSpec</code> JavaBeans each of
* which corresponds to an deployed endpoint application that was
* active prior to the system crash.
*
* @throws ResourceException generic exception if operation fails due to an
* error condition.
*
* @return an array of <code>XAResource</code> objects each of which
* represents a unique resource manager.
*/
XAResource[] getXAResources(ActivationSpec[] specs)
throws ResourceException;
}
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