java多线程体验3-实际项目应用

多线程发现短信的实例：
1、生产获取处理数据的类：

private class ScanTask extends TimerTask {

		@Override
		public void run() {
			// if there is no capacity, cancel this scan
			if (messageQueue.remainingCapacity() <= 0) {
				return;
			}
			// 取出比剩余容量两倍的信息，为下一分钟的扫描间隙准备，put方法可以挂在queue上
			List<SysMessageSending> candidate = sysMessageSendingDao.findForSending(messageQueue.remainingCapacity()*2);
			//System.out.println("取出" + messageQueue.remainingCapacity()*2);
			for (SysMessageSending msg : candidate ) {
				if (checkAppoint(msg)) {
					try {
						messageQueue.put(msg);
					} catch (InterruptedException e) {
						LOG.warn("putting in message Queue is interrupted.");
					}
				} else {
					// invalid message, delete from the message queue
					SysMessageSendingLog log = new SysMessageSendingLog();
					BeanUtils.copyProperties(msg, log);
					log.setId(null);
					log.setOid(msg.getId()); //copy the msg's ID as orginal ID
					log.setSendStatus(SysMessageSendingLog.SEND_STATUS_FAILED);
					sysMessageSendingLogDao.insert(log);
					sysMessageSendingDao.delete(msg);
				}
			}
			if (needReception) {
				LOG.info("start read receptions.");
				// scan the log table and find the message's whose reception is null
				List<SysMessageSendingLog> receptWanted = sysMessageSendingLogDao.findMessageLogForReception();
				for (SysMessageSendingLog log : receptWanted) {
					MessageChannel channel = messageChannelMap.get(log.getSendType());
					if (channel != null ) {
						String recept = channel.getReception(log.getSid());
						if (recept != null) {
							sysMessageSendingLogDao.updateReception(log.getSid(), recept);
						}
					}
				}
				LOG.info("end read receptions.");
			}
		}
	}

2、消费者，发送短信的线程类：

private class MessageSendingThread extends Thread {
		
		public MessageSendingThread() {
			this.setName("MessageSendService.MessageSendingThread");
		}
		/**
		 * write log and delete original message from queue
		 * @param msg
		 * @param success - true: send succefully, false: send failed and expired
		 */
		private void afterMessageSending(SysMessageSending msg, boolean success, String sid) {
			// write success log
			SysMessageSendingLog log = new SysMessageSendingLog();
			BeanUtils.copyProperties(msg, log);
			log.setId(null);
			log.setSid(sid);
			log.setOid(msg.getId()); //copy the msg's ID as orginal ID
			if (success) {
				log.setRealDate(new Date());
				log.setSendStatus(SysMessageSendingLog.SEND_STATUS_SUCCESS);
			} else {
				log.setSendStatus(SysMessageSendingLog.SEND_STATUS_FAILED);
			}
			sysMessageSendingLogDao.insert(log);
			// delete the message from the queue
			if (msg.getId() != null) {
				// if it's from the database, delete it
				sysMessageSendingDao.delete(msg);
			}
		}
		// do job
		public void run() {
			LOG.debug("SendingThread is started");
			while (true) {
				try {
					SysMessageSending msg = messageQueue.take();
					LOG.debug("a message was taken from the message queue. ready for sending");
					// try to get the correct message channel
					MessageChannel channel = messageChannelMap.get(msg.getSendType());
					if (channel != null ) {
						try {
							if (msg.getId() != null
									&& !sysMessageSendingDao.checkForSending(msg.getId())) {
								// NOTE: just locking the msg and status not synchronized yet!
								continue; // omit this msg, it's has been processed by another thread
							}
							// all the message in the queue take them as ready for sending
							Message message = new Message(msg.getContent());
							String sid = channel.sendMessage(msg.getAddress(), message.getSubject(), message.getText(),msg.getSmsUser());
							try {
								if (transactionManager != null) {
									// 把操作消息队列表和日志表的操作放置在一个事务中
									DefaultTransactionDefinition def = new DefaultTransactionDefinition();
									def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);
									TransactionStatus status = transactionManager.getTransaction(def);
									LOG.debug("sending successfully, start transaction  for writing message log");
									try {
										afterMessageSending(msg, true, sid);
									} catch (RuntimeException e) {
										// to prevent DAO exception interfering the message sending Exeption
										LOG.error("dao exception happend when transfering message to message log table.");
										LOG.error("detail error message:" + e.getMessage());
										transactionManager.rollback(status);
									}
									// commit the transaction
									if (!status.isCompleted()) {
										transactionManager.commit(status);
										LOG.debug("commit transaction.");
									}
									LOG.debug("end transaction for message log.");
								} else {
									afterMessageSending(msg, true, sid);
								}
							} catch (Exception e) {
								LOG.error("unknown error happend when transfering message to message log table.");
								e.printStackTrace(); // print detail unknown error
							}
						} catch (Exception e) {
							LOG.warn("error happended when try to send message to:"
									+ msg.getAddress() + " on message channel:" + channel);
							LOG.warn("error message:" + e.getMessage());
							// check if is it expired?
							if ( new Date().after(msg.getExpireDate()) ) {
								// write fail message log
								if (transactionManager != null) {
									// 把操作消息队列表和日志表的操作放置在一个事务中
									DefaultTransactionDefinition def = new DefaultTransactionDefinition();
									def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRES_NEW);
									TransactionStatus status = transactionManager.getTransaction(def);
									LOG.debug("send failed and message expired, start transaction for writing message log");
									try {
										afterMessageSending(msg, false, null);
									} catch (RuntimeException re) {
										LOG.error("dao exception happened and prevent operations on message sending tables. rolling back.");
										LOG.error("detail error message:" + e.getMessage());
										transactionManager.rollback(status);
									}
									if (!status.isCompleted()) {
										transactionManager.commit(status);
										LOG.debug("commit transaction.");
									}
									LOG.debug("end transaction for message log.");
								} else {
									afterMessageSending(msg, false, null);
								}
							} else {
								// not expired but failed
								if (msg.getId() == null) {
									LOG.info("message sending not succesful now, persist the message to the queue table.");
									msg.setStatus("0"); // error happend for the first time
									sysMessageSendingDao.insert(msg); // save the message if it's not persisted yet
								} else {
									// increase the error count
									sysMessageSendingDao.addErrorCount(msg);
								}
							}
						}
					} else {
						LOG.warn("ignored this message because cannot find right channel for the send type:" + msg.getSendType());
						LOG.info("set the status to FAILED directly for msg which cann't find right channel.");
						if (msg.getId() == null) {
							msg.setStatus(SysMessageSending.STATUS_FAILED);
							sysMessageSendingDao.insert(msg);
						} else {
							sysMessageSendingDao.changeMessageStatus(msg.getId(), SysMessageSending.STATUS_FAILED);
						}
					}
				} catch (InterruptedException e) {
					LOG.warn("taking on the blocking message queue is interrupted.");
				}
			}
		}
	}

3、短信发送主线程类：

public MessageSendServiceImpl(int bufferSize, int scanInteval, boolean needReception, boolean runThread) {
		
		LOG.debug("initialize message buffer queue size to " + bufferSize);
		this.messageQueue = new ArrayBlockingQueue<SysMessageSending>(bufferSize);
		// set if need reception
		this.needReception = needReception;
		if (runThread) {
			// start the inner thread - TODO 可以对于每一种通道开一个线程，提高性能，防止通道之间等待
			this.sendingThread = new MessageSendingThread();
			this.sendingThread.start(); // start the thread
			// start the scan thread
			this.timer.schedule(new ScanTask(), 1000, scanInteval);
		}
		
	}

4、Spring的配置：
<bean id="messageSendService" class="com.csair.cbd.sms.services.impl.MessageSendServiceImpl">
<constructor-arg type="int" value="100" /><!-- buffer size -->
<constructor-arg type="int" value="6000" /><!-- scan interval -->
<property name="messageChannels">
<list>
<bean id="smsChannel" class="com.csair.cbd.sms.services.impl.SMSChannel" >
<property name="url" value="http://10.101.116.12:888/SmsCenterWs/services/ISmsWS"></property> <!-- http://10.101.67.20:80/SmsCenterWs/services/ISmsWS -->
<!-- property name="username" value="test"></property>
<property name="password" value="test"></property-->
<property name="smsUser">
<map>
<!-- 实时发送短信接口帐号 -->
<entry key="sms_user_realtime">
<bean class="com.csair.cbd.system.services.dto.SmsUserDto">
<property name="userId" value="test"/>
<property name="password" value="test"/>
</bean>
</entry>
<!-- 非实时发送短信接口帐号 -->
<entry key="sms_user2_delay">
<bean class="com.csair.cbd.system.services.dto.SmsUserDto"> </bean>
</entry>
</map>
</property>

</bean>
<bean id="emailChannel" class="com.csair.cbd.sms.services.impl.EmailChannel">
</property>
</bean>
</list>
</property>
</bean>