How to use

setQueuePrefetch

method

in

org.apache.activemq.ActiveMQPrefetchPolicy

/**
 * Sets the prefeftch policy to one.
 */
protected void setPrefetchToOne() {
  ActiveMQPrefetchPolicy prefetchPolicy = getPrefetchPolicy();
  prefetchPolicy.setQueuePrefetch(1);
  prefetchPolicy.setTopicPrefetch(1);
  prefetchPolicy.setDurableTopicPrefetch(1);
  prefetchPolicy.setOptimizeDurableTopicPrefetch(1);
}

@Autowired
public ActiveMqMessagingService(DaemonThreadStatsCollector daemonThreadStatsCollector) throws Exception {
  this.daemonThreadStatsCollector = daemonThreadStatsCollector;
  SystemEnvironment systemEnvironment = new SystemEnvironment();
  broker = new BrokerService();
  broker.setBrokerName(BROKER_NAME);
  broker.setPersistent(false);
  broker.setUseJmx(systemEnvironment.getActivemqUseJmx());
  broker.getManagementContext().setConnectorPort(systemEnvironment.getActivemqConnectorPort());
  broker.start();
  factory = new ActiveMQConnectionFactory(BROKER_URL);
  factory.getPrefetchPolicy().setQueuePrefetch(systemEnvironment.getActivemqQueuePrefetch());
  factory.setCopyMessageOnSend(false);
  connection = (ActiveMQConnection) factory.createConnection();
  connection.start();
}

private ActiveMQPrefetchPolicy createActiveMQPrefetchPolicy() {
  ActiveMQPrefetchPolicy prefetchPolicy = new ActiveMQPrefetchPolicy();
  prefetchPolicy.setQueuePrefetch(0);
  prefetchPolicy.setTopicPrefetch(0);
  return prefetchPolicy;
}

@Override
protected void init() {
  cfg = (ActiveMqConfiguration) getConfiguration();
  if (null == cf) {
    cf = new ActiveMQConnectionFactory();
  }
  Object value;
  if ((value = cfg.getBrokerUrl()) != null) cf.setBrokerURL(String.valueOf(value));
  if ((value = cfg.getUsername()) != null) cf.setUserName(String.valueOf(value));
  if ((value = cfg.getPassword()) != null) cf.setPassword(String.valueOf(value));
  ActiveMQPrefetchPolicy policy = new ActiveMQPrefetchPolicy();
  policy.setQueuePrefetch(1);
  cf.setPrefetchPolicy(policy);
}

/**
* Sets the prefeftch policy to one.
*/
protected void setPrefetchToOne() {
 ActiveMQPrefetchPolicy prefetchPolicy = getPrefetchPolicy();
 prefetchPolicy.setQueuePrefetch(1);
 prefetchPolicy.setTopicPrefetch(1);
 prefetchPolicy.setDurableTopicPrefetch(1);
 prefetchPolicy.setOptimizeDurableTopicPrefetch(1);
}