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.transport.amqp;
  
  import static org.junit.Assert.assertTrue;
  
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import jakarta.jms.Connection;
  import jakarta.jms.ExceptionListener;
  import jakarta.jms.JMSException;
  import jakarta.jms.MessageConsumer;
  import jakarta.jms.MessageProducer;
  import jakarta.jms.Queue;
  import jakarta.jms.Session;
  import jakarta.jms.TextMessage;
  
  import org.apache.activemq.broker.BrokerService;
  import org.apache.activemq.broker.region.policy.PolicyEntry;
  import org.apache.activemq.broker.region.policy.PolicyMap;
  import org.apache.activemq.broker.region.policy.VMPendingQueueMessageStoragePolicy;
  import org.apache.activemq.broker.region.policy.VMPendingSubscriberMessageStoragePolicy;
  import org.apache.qpid.jms.JmsConnection;
  import org.junit.Test;
  
  public class JMSClientProducerFlowSendFailIfNoSpace extends JMSClientTestSupport {
  
      // used to test sendFailIfNoSpace on SystemUsage
      protected final AtomicBoolean gotResourceException = new AtomicBoolean(false);
  
      @Override
      protected void performAdditionalConfiguration(BrokerService brokerService) {
  
          // Setup a destination policy where it takes only 1 message at a time.
          PolicyMap policyMap = new PolicyMap();
          PolicyEntry policy = new PolicyEntry();
          policy.setMemoryLimit(1);
          policy.setPendingSubscriberPolicy(new VMPendingSubscriberMessageStoragePolicy());
          policy.setPendingQueuePolicy(new VMPendingQueueMessageStoragePolicy());
          policy.setProducerFlowControl(true);
          policyMap.setDefaultEntry(policy);
          brokerService.setDestinationPolicy(policyMap);
  
          brokerService.getSystemUsage().setSendFailIfNoSpace(true);
      }
  
      @Test(timeout = 60000)
      public void testPubisherRecoverAfterBlock() throws Exception {
          connection = createConnection();
  
          final Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
          final Queue queueA = session.createQueue(name.getMethodName());
          final MessageProducer producer = session.createProducer(queueA);
  
          final AtomicBoolean keepGoing = new AtomicBoolean(true);
  
          Thread thread = new Thread("Filler") {
              @Override
              public void run() {
                  while (keepGoing.get()) {
                      try {
                          producer.send(session.createTextMessage("Test message"));
                          if (gotResourceException.get()) {
                              // do not flood the broker with requests when full as we are
                              // sending async and they will be limited by the network buffers
                              Thread.sleep(200);
                          }
                      } catch (Exception e) {
                          // with async send, there will be no exceptions
                          LOG.info("Caught excepted exception: {}", e.getMessage());
                      }
                  }
              }
          };
          thread.start();
          waitForBlockedOrResourceLimit(new AtomicBoolean(false));
  
          // resourceException on second message, resumption if we
          // can receive 10
          MessageConsumer consumer = session.createConsumer(queueA);
          TextMessage msg;
          for (int idx = 0; idx < 10; ++idx) {
              msg = (TextMessage) consumer.receive(500);
              if (msg != null) {
                  msg.acknowledge();
              }
          }
  
          keepGoing.set(false);
      }
  
      @Test(timeout = 60000)
      public void testPubisherRecoverAfterBlockWithSyncSend() throws Exception {
          connection = createConnection(false, false);
  
          final Session session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
          final Queue queueA = session.createQueue(name.getMethodName());
          final MessageProducer producer = session.createProducer(queueA);
  
          final AtomicBoolean keepGoing = new AtomicBoolean(true);
          final AtomicInteger exceptionCount = new AtomicInteger(0);
          Thread thread = new Thread("Filler") {
              @Override
              public void run() {
                  while (keepGoing.get()) {
                      try {
                          producer.send(session.createTextMessage("Test message"));
                      } catch (JMSException jmsEx) {
                          LOG.debug("Client caught error: {} {}", jmsEx.getClass().getName(), jmsEx.getMessage());
                          gotResourceException.set(true);
                          exceptionCount.incrementAndGet();
                      }
                  }
              }
          };
          thread.start();
          waitForBlockedOrResourceLimit();
  
          // resourceException on second message, resumption if we
          // can receive 10
          MessageConsumer consumer = session.createConsumer(queueA);
          TextMessage msg;
          for (int idx = 0; idx < 10; ++idx) {
              msg = (TextMessage) consumer.receive(500);
              if (msg != null) {
                  msg.acknowledge();
              }
          }
  
          assertTrue("we were blocked at least 5 times", 5 < exceptionCount.get());
          keepGoing.set(false);
      }
  
      protected void waitForBlockedOrResourceLimit() throws InterruptedException {
          waitForBlockedOrResourceLimit(new AtomicBoolean(false));
      }
  
      protected void waitForBlockedOrResourceLimit(final AtomicBoolean done) throws InterruptedException {
          while (true) {
              Thread.sleep(100);
              // the producer is blocked once the done flag stays true or there is a resource exception
              if (done.get() || gotResourceException.get()) {
                  break;
              }
              done.set(true);
          }
      }
  
      @Override
      protected Connection createConnection() throws JMSException {
          return createConnection(true, true);
      }
  
      protected Connection createConnection(boolean async, boolean exceptionListener) throws JMSException {
          connection = super.createConnection();
  
          JmsConnection jmsConnection = (JmsConnection) connection;
          jmsConnection.setForceAsyncSend(async);
  
          if (exceptionListener) {
              connection.setExceptionListener(new ExceptionListener() {
                  @Override
                  public void onException(JMSException jmsEx) {
                      LOG.debug("Client caught error: {} {}", jmsEx.getClass().getName(), jmsEx.getMessage());
                      gotResourceException.set(true);
                  }
              });
          }
  
          connection.start();
  
          return connection;
      }
  }
  