ActiveMQ example source code file (QueueStorePrefetch.java)

This example ActiveMQ source code file (QueueStorePrefetch.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

abstractstorecursor, exception, exception, failed, failed, io, ioexception, logger, messagestore, override, override, queuestoreprefetch, queuestoreprefetch, runtimeexception, string

The ActiveMQ QueueStorePrefetch.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.broker.region.cursors;

import java.io.IOException;
import org.apache.activemq.broker.region.Queue;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageId;
import org.apache.activemq.store.MessageStore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * persist pending messages pending message (messages awaiting dispatch to a
 * consumer) cursor
 * 
 * 
 */
class QueueStorePrefetch extends AbstractStoreCursor {
    private static final Logger LOG = LoggerFactory.getLogger(QueueStorePrefetch.class);
    private final MessageStore store;
   
    /**
     * Construct it
     * @param queue
     */
    public QueueStorePrefetch(Queue queue) {
        super(queue);
        this.store = queue.getMessageStore();

    }

    public boolean recoverMessageReference(MessageId messageReference) throws Exception {
        Message msg = this.store.getMessage(messageReference);
        if (msg != null) {
            return recoverMessage(msg);
        } else {
            String err = "Failed to retrieve message for id: " + messageReference;
            LOG.error(err);
            throw new IOException(err);
        }
    }

   
        
    @Override
    protected synchronized int getStoreSize() {
        try {
            int result = this.store.getMessageCount();
            return result;
            
        } catch (IOException e) {
            LOG.error("Failed to get message count", e);
            throw new RuntimeException(e);
        }
    }
    
    @Override
    protected synchronized boolean isStoreEmpty() {
        try {
            return this.store.isEmpty();
            
        } catch (Exception e) {
            LOG.error("Failed to get message count", e);
            throw new RuntimeException(e);
        }
    }
    
    @Override
    protected void resetBatch() {
        this.store.resetBatching();
    }
    
    @Override
    protected void setBatch(MessageId messageId) throws Exception {
        store.setBatch(messageId);
        batchResetNeeded = false;
    }

    
    @Override
    protected void doFillBatch() throws Exception {
        this.store.recoverNextMessages(this.maxBatchSize, this);
    }

    @Override
    public String toString() {
        return "QueueStorePrefetch" + System.identityHashCode(this);
    }

}