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.tool;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import jakarta.jms.JMSException;
  import jakarta.jms.Message;
  import jakarta.jms.MessageListener;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A simple container of messages for performing testing and rendezvous style
   * code. You can use this class a {@link MessageListener} and then make
   * assertions about how many messages it has received allowing a certain maximum
   * amount of time to ensure that the test does not hang forever.
   * <p/>
   * Also you can chain these instances together with the
   * {@link #setParent(MessageListener)} method so that you can aggregate the
   * total number of messages consumed across a number of consumers.
   *
   * 
   */
  public class MemMessageIdList implements MessageListener {
  
      protected static final Logger LOG = LoggerFactory.getLogger(MemMessageIdList.class);
  
      private List<String> messageIds = new ArrayList<String>();
      private Object semaphore;
      private boolean verbose;
      private MessageListener parent;
      private long maximumDuration = 15000L;
  
      public MemMessageIdList() {
          this(new Object());
      }
  
      public MemMessageIdList(Object semaphore) {
          this.semaphore = semaphore;
      }
  
      public boolean equals(Object that) {
          if (that instanceof MemMessageIdList) {
              MemMessageIdList thatListMem = (MemMessageIdList) that;
              return getMessageIds().equals(thatListMem.getMessageIds());
          }
          return false;
      }
  
      public int hashCode() {
          synchronized (semaphore) {
              return messageIds.hashCode() + 1;
          }
      }
  
      public String toString() {
          synchronized (semaphore) {
              return messageIds.toString();
          }
      }
  
      /**
       * @return all the messages on the list so far, clearing the buffer
       */
      public List<String> flushMessages() {
          synchronized (semaphore) {
              List<String> answer = new ArrayList<String>(messageIds);
              messageIds.clear();
              return answer;
          }
      }
  
      public synchronized List<String> getMessageIds() {
          synchronized (semaphore) {
              return new ArrayList<String>(messageIds);
          }
      }
  
      public void onMessage(Message message) {
          String id = null;
          try {
              id = message.getJMSMessageID();
              synchronized (semaphore) {
                  messageIds.add(id);
                  semaphore.notifyAll();
              }
              if (verbose) {
                  LOG.info("Received message: " + message);
              }
          } catch (JMSException e) {
              e.printStackTrace();
          }
          if (parent != null) {
              parent.onMessage(message);
          }
      }
  
      public int getMessageCount() {
          synchronized (semaphore) {
              return messageIds.size();
          }
      }
  
      public void waitForMessagesToArrive(int messageCount) {
          LOG.info("Waiting for " + messageCount + " message(s) to arrive");
  
          long start = System.currentTimeMillis();
  
          for (int i = 0; i < messageCount; i++) {
              try {
                  if (hasReceivedMessages(messageCount)) {
                      break;
                  }
                  long duration = System.currentTimeMillis() - start;
                  if (duration >= maximumDuration) {
                      break;
                  }
                  synchronized (semaphore) {
                      semaphore.wait(maximumDuration - duration);
                  }
              } catch (InterruptedException e) {
                  LOG.info("Caught: " + e);
              }
          }
          long end = System.currentTimeMillis() - start;
  
          LOG.info("End of wait for " + end + " millis and received: " + getMessageCount() + " messages");
      }
  
  
      public boolean hasReceivedMessage() {
          return getMessageCount() == 0;
      }
  
      public boolean hasReceivedMessages(int messageCount) {
          return getMessageCount() >= messageCount;
      }
  
      public boolean isVerbose() {
          return verbose;
      }
  
      public void setVerbose(boolean verbose) {
          this.verbose = verbose;
      }
  
      public MessageListener getParent() {
          return parent;
      }
  
      /**
       * Allows a parent listener to be specified such as to aggregate messages
       * consumed across consumers
       */
      public void setParent(MessageListener parent) {
          this.parent = parent;
      }
  
  }
  