DeliveryChannel.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package javax.jbi.messaging;

import javax.jbi.servicedesc.ServiceEndpoint;

import javax.xml.namespace.QName;

/**
 * Bi-directional communication channel used to interact with the Normalized
 * Message Service.
 *
 * @author JSR208 Expert Group
 */
public interface DeliveryChannel
{
    /**
     * Closes the delivery channel, halting all message traffic.
     *
     * @throws MessagingException fatal error while closing channel.
     */
    void close() throws MessagingException;

    /**
     * Create a message exchange factory. This factory will create exchange
     * instances with all appropriate properties set to null.
     *
     * @return a message exchange factory
     */
    MessageExchangeFactory createExchangeFactory();

    /**
     * Create a message exchange factory for the given interface name.
     *
     * @param interfaceName name of the interface for which all exchanges
     *                      created by the returned factory will be set
     * @return an exchange factory that will create exchanges for the given
     *         interface; must be non-null
     */
    MessageExchangeFactory createExchangeFactory(QName interfaceName);

    /**
     * Create a message exchange factory for the given service name.
     *
     * @param serviceName name of the service for which all exchanges
     *                    created by the returned factory will be set
     * @return an exchange factory that will create exchanges for the given
     *         service; must be non-null
     */
    MessageExchangeFactory createExchangeFactoryForService(QName serviceName);

    /**
     * Create a message exchange factory for the given endpoint.
     *
     * @param endpoint endpoint for which all exchanges created by the
     *                 returned factory will be set for
     * @return an exchange factory that will create exchanges for the
     *         given endpoint
     */
    MessageExchangeFactory createExchangeFactory(ServiceEndpoint endpoint);

    /**
     * Blocking call used to service a MessageExchange instance which has
     * been initiated by another component.  This method supports concurrent
     * invocation for multi-threaded environments.
     *
     * @return mesage exchange instance
     * @throws MessagingException failed to accept
     */
    MessageExchange accept() throws MessagingException;

    /**
     * Identical to accept(), but returns after specified interval even if
     * a message exchange is unavailable.
     *
     * @param timeout time to wait in milliseconds
     * @return mesage exchange instance or null if timeout is reached
     * @throws MessagingException failed to accept
     */
    MessageExchange accept(long timeout) throws MessagingException;

    /**
     * Routes a MessageExchange instance through the Normalized Message Service
     * to the appropriate servicing component. This method supports concurrent
     * invocation for multi-threaded environments.
     *
     * @param exchange message exchange to send
     * @throws MessagingException unable to send exchange
     */
    void send(MessageExchange exchange) throws MessagingException;

    /**
     * Routes a MessageExchange instance through the Normalized Message Service
     * to the appropriate servicing component, blocking until the exchange is
     * returned.  This method supports concurrent invocation for multi-threaded
     * environments.
     *
     * @param exchange message exchange to send
     * @return true if the exchange has been processed and returned by the
     *         servicing component, false otherwise.
     * @throws MessagingException unable to send exchange
     */
    boolean sendSync(MessageExchange exchange) throws MessagingException;

    /**
     * Routes a MessageExchange instance through the Normalized Message Service
     * to the appropriate servicing component, blocking until the specified
     * timeout is reached.  This method supports concurrent invocation for
     * multi-threaded environments.
     *
     * @param exchange message exchange to send
     * @param timeout time to wait in milliseconds
     * @return true if the exchange has been processed and returned by the
     *         servicing component, false in the case of timeout.
     * @throws MessagingException unable to send exchange
     */
    boolean sendSync(MessageExchange exchange, long timeout) throws MessagingException;

}