MessageEndpointFactory.java

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package javax.resource.spi.endpoint;

import java.lang.NoSuchMethodException;
import javax.transaction.xa.XAResource;
import javax.resource.spi.UnavailableException;

/**
 * This serves as a factory for creating message endpoints.
 *
 * @version 1.0
 * @author  Ram Jeyaraman
 */
public interface MessageEndpointFactory {

    /**
     * This is used to create a message endpoint. The message endpoint is
     * expected to implement the correct message listener type.
     *
     * @param xaResource an optional <code>XAResource</code> 
     * instance used to get transaction notifications when the message delivery
     * is transacted.
     *
     * @return a message endpoint instance.
     *
     * @throws UnavailableException indicates a transient failure
     * in creating a message endpoint. Subsequent attempts to create a message
     * endpoint might succeed.
     */
    MessageEndpoint createEndpoint(XAResource xaResource)
	throws UnavailableException;

    /**
     * This is used to create a message endpoint. The message endpoint is
     * expected to implement the correct message listener type.
     *
     * @param xaResource an optional <code>XAResource</code> 
     * instance used to get transaction notifications when the message delivery
     * is transacted.
     * 
     * @param timeout an optional value used to specify the time duration
     * (in milliseconds) within which the message endpoint needs to be
     * created by the <code>MessageEndpointFactory</code>. Otherwise, the
     * <code>MessageEndpointFactory</code> rejects the creation of the
     * <code>MessageEndpoint</code> with an UnavailableException.  Note, this
     * does not offer real-time guarantees.
     * 
     * @return a message endpoint instance.
     *
     * @throws UnavailableException indicates a transient failure
     * in creating a message endpoint. Subsequent attempts to create a message
     * endpoint might succeed.
     */
    MessageEndpoint createEndpoint(XAResource xaResource, long timeout)
    throws UnavailableException;

    /**
     * This is used to find out whether message deliveries to a target method
     * on a message listener interface that is implemented by a message 
     * endpoint will be transacted or not. 
     *
     * The message endpoint may indicate its transacted delivery preferences 
     * (at a per method level) through its deployment descriptor. The message 
     * delivery preferences must not change during the lifetime of a 
     * message endpoint. 
     * 
     * @param method description of a target method. This information about
     * the intended target method allows an application server to find out 
     * whether the target method call will be transacted or not.
     *
     * @throws NoSuchMethodException indicates that the specified method
     * does not exist on the target endpoint.
     *
     * @return true, if message endpoint requires transacted message delivery.
     */
    boolean isDeliveryTransacted(java.lang.reflect.Method method)
	throws NoSuchMethodException;
}