Apache CXF example source code file (MDBInvoker.java)

This example Apache CXF source code file (MDBInvoker.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Apache CXF tags/keywords

interruptedexception, log, log, logging, max_attempts, max_attempts, mdbinvoker, mdbinvoker, messageendpoint, messageendpoint, messageendpointfactory, object, object, override, target, will

The Apache CXF MDBInvoker.java source code

/**
 * 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 org.apache.cxf.jca.inbound;

import java.util.logging.Logger;

import javax.resource.spi.UnavailableException;
import javax.resource.spi.endpoint.MessageEndpoint;
import javax.resource.spi.endpoint.MessageEndpointFactory;

import org.apache.cxf.common.logging.LogUtils;
import org.apache.cxf.message.Exchange;
import org.apache.cxf.service.invoker.AbstractInvoker;

/**
 * An invoker that supports direct Message Driven Bean invocation.  
 * It get invoked in the context of the Message Driven Bean that 
 * activates the CXF service endpoint facade.  Applications that put 
 * service implementation inside the Message Driven Bean that activates 
 * the inbound endpoint facade should choose this invoker.  It is 
 * more straightforward and faster than {@link DispatchMBDInvoker} but 
 * it requires to modify resource adapter's deployment descriptor (ra.xml)
 * as the <messaging-type> needs to be set to the Service Endpoint Interface
 * (SEI) class.
 */
public class MDBInvoker extends AbstractInvoker {
    private static final Logger LOG = LogUtils.getL7dLogger(MDBInvoker.class);
    private static final int MAX_ATTEMPTS = 5;
    private static final long RETRY_SLEEP = 2000;
    
    private final MessageEndpointFactory endpointFactory;

    /**
     * @param messageEndpoint
     */
    public MDBInvoker(MessageEndpointFactory factory) {
        endpointFactory = factory;
    }

    /**
     * @return the messageEndpoint
     */
    public MessageEndpoint getMessageEndpoint() {
        return createMessageEndpoint();
    }

    protected void releaseEndpoint(MessageEndpoint mep) {
        mep.release();
    }

    @Override
    public Object getServiceObject(Exchange context) {
        return getMessageEndpoint();
    }
    
    public void releaseServiceObject(final Exchange context, Object obj) {
        if (obj instanceof MessageEndpoint) {
            MessageEndpoint mep = (MessageEndpoint)obj;
            releaseEndpoint(mep);
        }
    }

    /**
     * Invokes endpoint factory to create message endpoint (event driven bean).
     * It will retry if the event driven bean is not yet available.
     */
    private MessageEndpoint createMessageEndpoint() {
        MessageEndpoint ep = null;
        for (int i = 0; i < MAX_ATTEMPTS; i++) {
            try {
                ep = endpointFactory.createEndpoint(null);
                break;
            } catch (UnavailableException e) {
                LOG.fine("Target endpoint activation in progress.  Will retry.");
                try {
                    Thread.sleep(RETRY_SLEEP);
                } catch (InterruptedException e1) {
                    // ignore
                }
            }
        }
        
        return ep;
    }
}