ActiveMQ example source code file (AbstractMessageStore.java)

This example ActiveMQ source code file (AbstractMessageStore.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 - ActiveMQ tags/keywords

abstractmessagestore, activemqdestination, callableimplementation, callableimplementation, connectioncontext, exception, exception, future, future, futuretask, io, ioexception, ioexception, message, messageack, threading, threads

The ActiveMQ AbstractMessageStore.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.activemq.store;

import java.io.IOException;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.usage.MemoryUsage;

abstract public class AbstractMessageStore implements MessageStore {
    public static final FutureTask<Object> FUTURE;
    protected final ActiveMQDestination destination;
    protected boolean prioritizedMessages;

    public AbstractMessageStore(ActiveMQDestination destination) {
        this.destination = destination;
    }
    
    public void dispose(ConnectionContext context) {
    }

    public void start() throws Exception {
    }

    public void stop() throws Exception {
    }

    public ActiveMQDestination getDestination() {
        return destination;
    }

    public void setMemoryUsage(MemoryUsage memoryUsage) {
    }

    public void setBatch(MessageId messageId) throws IOException, Exception {
    }

    /**
     * flag to indicate if the store is empty
     * 
     * @return true if the message count is 0
     * @throws Exception
     */
    public boolean isEmpty() throws Exception {
        return getMessageCount() == 0;
    }
    
    public void setPrioritizedMessages(boolean prioritizedMessages) {
        this.prioritizedMessages = prioritizedMessages;
    }    

    public boolean isPrioritizedMessages() {
        return this.prioritizedMessages;
    }

    public Future<Object> asyncAddQueueMessage(final ConnectionContext context, final Message message) throws IOException {
        addMessage(context, message);
        return FUTURE;
    }

       
    public Future<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message) throws IOException {
        addMessage(context, message);
        return FUTURE;
    }

    public void removeAsyncMessage(ConnectionContext context, MessageAck ack) throws IOException {
        removeMessage(context, ack);
    }
    
    static class CallableImplementation implements Callable<Object> {
        public Object call() throws Exception {
            return null;
        }
    }

    static {
       FUTURE = new FutureTask<Object>(new CallableImplementation());
       FUTURE.run();
    }
}