activemq-broker/src/main/java/org/apache/activemq/util/BrokerSupport.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.util;

import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.ProducerBrokerExchange;
import org.apache.activemq.command.ActiveMQDestination;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.ProducerInfo;
import org.apache.activemq.security.SecurityContext;
import org.apache.activemq.state.ProducerState;

/**
 * Utility class for broker operations
 *
 */
public final class BrokerSupport {

    private BrokerSupport() {
    }

    public static void resendNoCopy(final ConnectionContext context, Message originalMessage, ActiveMQDestination deadLetterDestination) throws Exception {
        doResend(context, originalMessage, deadLetterDestination, false);
    }

    /**
     * @param context
     * @param originalMessage
     * @param deadLetterDestination
     * @throws Exception
     */
    public static void resend(final ConnectionContext context, Message originalMessage, ActiveMQDestination deadLetterDestination) throws Exception {
        doResend(context, originalMessage, deadLetterDestination, true);
    }

    public static void doResend(final ConnectionContext context, Message originalMessage, ActiveMQDestination deadLetterDestination, boolean copy) throws Exception {
        Message message = copy ? originalMessage.copy() : originalMessage;
        message.setOriginalDestination(message.getDestination());
        message.setOriginalTransactionId(message.getTransactionId());
        message.setDestination(deadLetterDestination);
        message.setTransactionId(null);
        message.setMemoryUsage(null);
        message.setRedeliveryCounter(0);
        message.getMessageId().setDataLocator(null);
        boolean originalFlowControl = context.isProducerFlowControl();
        try {
            context.setProducerFlowControl(false);
            ProducerInfo info = new ProducerInfo();
            ProducerState state = new ProducerState(info);
            ProducerBrokerExchange producerExchange = new ProducerBrokerExchange();
            producerExchange.setProducerState(state);
            producerExchange.setMutable(true);
            producerExchange.setConnectionContext(context);
            context.getBroker().send(producerExchange, message);
        } finally {
            context.setProducerFlowControl(originalFlowControl);
        }
    }

    /**
     * Returns the broker's administration connection context used for
     * configuring the broker at startup
     */
    public static ConnectionContext getConnectionContext(Broker broker) {
        ConnectionContext adminConnectionContext = broker.getAdminConnectionContext();
        if (adminConnectionContext == null) {
            adminConnectionContext = createAdminConnectionContext(broker);
            broker.setAdminConnectionContext(adminConnectionContext);
        }
        return adminConnectionContext;
    }

    /**
     * Factory method to create the new administration connection context
     * object. Note this method is here rather than inside a default broker
     * implementation to ensure that the broker reference inside it is the outer
     * most interceptor
     */
    protected static ConnectionContext createAdminConnectionContext(Broker broker) {
        ConnectionContext context = new ConnectionContext();
        context.setBroker(broker);
        context.setSecurityContext(SecurityContext.BROKER_SECURITY_CONTEXT);
        return context;
    }
}