content: /**
   * 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.policy;
  
  import org.apache.activemq.ActiveMQMessageAudit;
  import org.apache.activemq.command.Message;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A strategy for choosing which destination is used for dead letter queue
   * messages.
   *
   */
  public abstract class AbstractDeadLetterStrategy implements DeadLetterStrategy {
      private static final Logger LOG = LoggerFactory.getLogger(AbstractDeadLetterStrategy.class);
      private boolean processNonPersistent = false;
      private boolean processExpired = true;
      private boolean enableAudit = true;
      private long expiration;
  
      @Override
      public void rollback(Message message) {
          if (message != null && this.enableAudit) {
              lookupActiveMQMessageAudit(message, true).rollback(message);
          }
      }
  
      @Override
      public boolean isSendToDeadLetterQueue(Message message) {
          boolean result = false;
          if (message != null) {
              result = true;
              if (enableAudit && lookupActiveMQMessageAudit(message, false).isDuplicate(message)) {
                  result = false;
                  LOG.debug("Not adding duplicate to DLQ: {}, dest: {}", message.getMessageId(), message.getDestination());
              }
              if (!message.isPersistent() && !processNonPersistent) {
                  result = false;
              }
              if (message.isExpired() && !processExpired) {
                  result = false;
              }
          }
          return result;
      }
  
      /**
       * @return the processExpired
       */
      @Override
      public boolean isProcessExpired() {
          return this.processExpired;
      }
  
      /**
       * @param processExpired the processExpired to set
       */
      @Override
      public void setProcessExpired(boolean processExpired) {
          this.processExpired = processExpired;
      }
  
      /**
       * @return the processNonPersistent
       */
      @Override
      public boolean isProcessNonPersistent() {
          return this.processNonPersistent;
      }
  
      /**
       * @param processNonPersistent the processNonPersistent to set
       */
      @Override
      public void setProcessNonPersistent(boolean processNonPersistent) {
          this.processNonPersistent = processNonPersistent;
      }
  
      public boolean isEnableAudit() {
          return enableAudit;
      }
  
      public void setEnableAudit(boolean enableAudit) {
          this.enableAudit = enableAudit;
      }
  
      public long getExpiration() {
          return expiration;
      }
  
      public void setExpiration(long expiration) {
          this.expiration = expiration;
      }
  
      public abstract int getMaxProducersToAudit();
  
      public abstract void setMaxProducersToAudit(int maxProducersToAudit);
  
      public abstract void setMaxAuditDepth(int maxAuditDepth);
  
      public abstract int getMaxAuditDepth();
  
      protected abstract ActiveMQMessageAudit lookupActiveMQMessageAudit(Message message, boolean rollback);
  }
  