001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.activemq.broker.region.policy;
018    
019    import org.apache.activemq.ActiveMQMessageAudit;
020    import org.apache.activemq.broker.region.MessageReference;
021    import org.apache.activemq.broker.region.Subscription;
022    import org.apache.activemq.command.ActiveMQDestination;
023    import org.apache.activemq.command.Message;
024    import org.slf4j.Logger;
025    import org.slf4j.LoggerFactory;
026    
027    /**
028     * A strategy for choosing which destination is used for dead letter queue
029     * messages.
030     * 
031     * 
032     */
033    public abstract class AbstractDeadLetterStrategy implements DeadLetterStrategy {
034        private static final Logger LOG = LoggerFactory.getLogger(AbstractDeadLetterStrategy.class);
035        private boolean processNonPersistent = false;
036        private boolean processExpired = true;
037        private ActiveMQMessageAudit audit = new ActiveMQMessageAudit();
038    
039        public boolean isSendToDeadLetterQueue(Message message) {
040            boolean result = false;
041            if (message != null) {
042                result = true;
043                if (audit.isDuplicate(message)) {
044                    result = false;
045                    if (LOG.isDebugEnabled()) {
046                        LOG.debug("Not adding duplicate to DLQ: " + message.getMessageId() + ", dest: " + message.getDestination());
047                    }
048                }
049                if (!message.isPersistent() && !processNonPersistent) {
050                    result = false;
051                }
052                if (message.isExpired() && !processExpired) {
053                    result = false;
054                }
055            }
056            return result;
057        }
058    
059        /**
060         * @return the processExpired
061         */
062        public boolean isProcessExpired() {
063            return this.processExpired;
064        }
065    
066        /**
067         * @param processExpired the processExpired to set
068         */
069        public void setProcessExpired(boolean processExpired) {
070            this.processExpired = processExpired;
071        }
072    
073        /**
074         * @return the processNonPersistent
075         */
076        public boolean isProcessNonPersistent() {
077            return this.processNonPersistent;
078        }
079    
080        /**
081         * @param processNonPersistent the processNonPersistent to set
082         */
083        public void setProcessNonPersistent(boolean processNonPersistent) {
084            this.processNonPersistent = processNonPersistent;
085        }
086    
087    }