ConnectionAudit.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 org.apache.activemq;

import java.util.LinkedHashMap;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.util.LRUCache;

/**
 * An auditor class for a Connection that looks for duplicates
 */
class ConnectionAudit {

    private boolean checkForDuplicates;
    private LinkedHashMap<ActiveMQDestination, ActiveMQMessageAudit> destinations = new LRUCache<ActiveMQDestination, ActiveMQMessageAudit>(1000);
    private LinkedHashMap<ActiveMQDispatcher, ActiveMQMessageAudit> dispatchers = new LRUCache<ActiveMQDispatcher, ActiveMQMessageAudit>(1000);

    
	private int auditDepth = ActiveMQMessageAudit.DEFAULT_WINDOW_SIZE;
	private int auditMaximumProducerNumber = ActiveMQMessageAudit.MAXIMUM_PRODUCER_COUNT;
	
	
    synchronized void removeDispatcher(ActiveMQDispatcher dispatcher) {
        dispatchers.remove(dispatcher);
    }

    synchronized boolean isDuplicate(ActiveMQDispatcher dispatcher, Message message) {
        if (checkForDuplicates && message != null) {
            ActiveMQDestination destination = message.getDestination();
            if (destination != null) {
                if (destination.isQueue()) {
                    ActiveMQMessageAudit audit = destinations.get(destination);
                    if (audit == null) {
                        audit = new ActiveMQMessageAudit(auditDepth, auditMaximumProducerNumber);
                        destinations.put(destination, audit);
                    }
                    boolean result = audit.isDuplicate(message);
                    return result;
                }
                ActiveMQMessageAudit audit = dispatchers.get(dispatcher);
                if (audit == null) {
                    audit = new ActiveMQMessageAudit(auditDepth, auditMaximumProducerNumber);
                    dispatchers.put(dispatcher, audit);
                }
                boolean result = audit.isDuplicate(message);
                return result;
            }
        }
        return false;
    }

    protected synchronized void rollbackDuplicate(ActiveMQDispatcher dispatcher, Message message) {
        if (checkForDuplicates && message != null) {
            ActiveMQDestination destination = message.getDestination();
            if (destination != null) {
                if (destination.isQueue()) {
                    ActiveMQMessageAudit audit = destinations.get(destination);
                    if (audit != null) {
                        audit.rollback(message);
                    }
                } else {
                    ActiveMQMessageAudit audit = dispatchers.get(dispatcher);
                    if (audit != null) {
                        audit.rollback(message);
                    }
                }
            }
        }
    }

    /**
     * @return the checkForDuplicates
     */
    boolean isCheckForDuplicates() {
        return this.checkForDuplicates;
    }

    /**
     * @param checkForDuplicates the checkForDuplicates to set
     */
    void setCheckForDuplicates(boolean checkForDuplicates) {
        this.checkForDuplicates = checkForDuplicates;
    }

	public int getAuditDepth() {
		return auditDepth;
	}

	public void setAuditDepth(int auditDepth) {
		this.auditDepth = auditDepth;
	}

	public int getAuditMaximumProducerNumber() {
		return auditMaximumProducerNumber;
	}

	public void setAuditMaximumProducerNumber(int auditMaximumProducerNumber) {
		this.auditMaximumProducerNumber = auditMaximumProducerNumber;
	}
    
}