RabbitMQ 延迟队列实现订单支付结果异步阶梯性通知

在第三方支付中，例如支付宝、或者微信，对于订单请求，第三方支付系统采用的是消息同步返回、异步通知+主动补偿查询的补偿机制。

由于互联网通信的不可靠性，例如双方网络、服务器、应用等因素的影响，不管是同步返回、异步通知、主动查询报文都可能出现超时无响应、报文丢失等情况，所以像支付业务，对结果的通知一般采用几种方案结合的补偿机制，不能完全依赖某一种机制。
例如一个支付结果的通知，一方面会在支付页面跳转时候返回支付结果（一般只用作前端展示使用，非最终状态），同时会采用后台异步通知机制（有前台、后台通知的，以后台异步通知结果为准），但由于前台跳转、后台结果通知都可能失效，因此还以定时补单+请求方主动查询接口作为辅助手段。
常见的补单操作，任务调度策略一般设定30秒、60秒、3分钟、6分钟、10分钟调度多次（以自己业务需要），如果调度接收到响应确认报文，补单成功，则中止对应订单的调度任务；如果超过补单上限次数，则停止补单，避免无谓的资源浪费。请求端随时可以发起请求报文查询对应订单的状态。
在日常开发中，对于网站前端来说，支付计费中心对于订单请求信息的处理也是通过消息同步返回、异步通知+主动补偿查询相结合的机制，其中对于订单的异步通知，目前的通知策略为3s、30s、60s、120s、180、300s的阶梯性通知。返回成功情况下就不继续通知了，本来打算使用将失败的消息写到数据库等待发送，然后每秒查询数据库获取消息通知前端。但觉得这样的处理方式太粗暴。存在以下缺点：
1 、每秒请求有点儿浪费资源； 2 、通知方式不稳定； 3 、无法承受大数据量等等
所以最终打算使用rabbitmq的消息延迟+死信队列来实现。消息模型如下：

producer发布消息，通过exchangeA的消息会被分发到QueueA,Consumer监听queueA，一旦有消息到来就被消费，这边的消费业务就是通知前端，如果通知失败，就创建一个延迟队列declareQueue，设置每个消息的ttl然后通过declare_exchange将消息分发到declare_queue,因为declare_queue没有consumer并且declare_queue中的消息设置了ttl，当ttl到期后，将通过DEX路由到queueA,被重新消费。
代码如下：DeclareQueue.java
  1. package org.delayQueue;
  2. 	
  3. import com.rabbitmq.client.BuiltinExchangeType;
  4. import com.rabbitmq.client.Channel;
  5. import com.rabbitmq.client.Connection;
  6. import com.rabbitmq.client.ConnectionFactory;
  7.  
  8. public class DeclareQueue {
  9. 	public static String EXCHANGE_NAME = "notifyExchange";
  10.  
  11. 	public static void init() {
  12. 		ConnectionFactory factory = new ConnectionFactory();
  13. 		factory.setHost("localhost");
  14. 		factory.setPort(5672);
  15.  
  16. 		Connection connection = null;
  17. 		try {
  18. 			connection = factory.newConnection();
  19. 			Channel channel = connection.createChannel();
  20. 			channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
  21. 			String routingKey = "AliPaynotify";
  22. 			String message = "http://localhost:8080/BossCenter/payGateway/notifyRecv.jsp?is_success=T¬ify_id=4ab9bed148d043d0bf75460706f7774a¬ify_time=2014-08-29+16%3A22%3A02¬ify_type=trade_status_sync&out_trade_no=1421712120109862&total_fee=424.42&trade_no=14217121201098611&trade_status=TRADE_SUCCESS";
  23. 			channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
  24. 			System.out.println(" [x] Sent :" + message);
  25. 		} catch (Exception e) {
  26. 			// TODO Auto-generated catch block
  27. 			e.printStackTrace();
  28. 		} finally {
  29. 			if (connection != null) {
  30. 				try {
  31. 					connection.close();
  32. 				} catch (Exception ignore) {
  33. 				}
  34. 			}
  35. 		}
  36. 	}
  37.  
  38. 	public static void main(String args[]) {
  39. 		init();
  40. 	}
  41.  
  42. }

DeclareConsumer.java
  1. package org.delayQueue;
  2.  
  3. import java.io.BufferedReader;
  4. import java.io.IOException;
  5. import java.io.InputStreamReader;
  6. import java.util.ArrayList;
  7. import java.util.HashMap;
  8. import java.util.List;
  9. import java.util.Map;
  10. import java.util.Map.Entry;
  11.  
  12. import org.apache.http.HttpResponse;
  13. import org.apache.http.client.ClientProtocolException;
  14. import org.apache.http.client.HttpClient;
  15. import org.apache.http.client.methods.HttpPost;
  16. import org.apache.http.impl.client.DefaultHttpClient;
  17.  
  18. import com.rabbitmq.client.AMQP;
  19. import com.rabbitmq.client.Channel;
  20. import com.rabbitmq.client.Connection;
  21. import com.rabbitmq.client.ConnectionFactory;
  22. import com.rabbitmq.client.Consumer;
  23. import com.rabbitmq.client.DefaultConsumer;
  24. import com.rabbitmq.client.Envelope;
  25.  
  26. public class DeclareConsumer {
  27. 	public static String EXCHANGE_NAME = "notifyExchange";
  28. 	public static String QU_declare_15S = "Qu_declare_15s";
  29. 	public static String EX_declare_15S = "EX_declare_15s";
  30. 	public static String ROUTINGKEY = "AliPaynotify";
  31. 	public static Connection connection = null;
  32. 	public static Channel channel = null;
  33. 	public static Channel DECLARE_15S_CHANNEL = null;
  34. 	public static String declare_queue = "init";
  35. 	public static String originalExpiration = "0";
  36. 	public static void init() throws Exception {
  37. 		ConnectionFactory factory = new ConnectionFactory();
  38. 		factory.setHost("localhost");
  39. 		factory.setPort(5672);
  40. 		connection = factory.newConnection();
  41. 		channel = connection.createChannel();
  42. 		DECLARE_15S_CHANNEL = connection.createChannel();
  43. 	}
  44.  
  45. 	public static void consume() {
  46. 		try {
  47. 			channel.exchangeDeclare(EXCHANGE_NAME, "topic");
  48. 			final String queueName = channel.queueDeclare().getQueue();
  49.  
  50. 			channel.queueBind(queueName, EXCHANGE_NAME, ROUTINGKEY);
  51. 			System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
  52. 			final Consumer consumer = new DefaultConsumer(channel) {
  53. 				@Override
  54. 				public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
  55. 					String message = new String(body, "UTF-8");
  56. 					Map<String, Object> headers = properties.getHeaders();
  57. 					if (headers != null) {
  58. 						List<Map<String, Object>> xDeath = (List<Map<String, Object>>) headers.get("x-death");
  59. 						System.out.println("xDeath--- > " + xDeath);
  60. 						if (xDeath != null && !xDeath.isEmpty()) {
  61. 							Map<String, Object> entrys = xDeath.get(0);
  62. 							// for(Entry<String, Object>
  63. 							// entry:entrys.entrySet()){
  64. 							// System.out.println(entry.getKey()+":"+entry.getValue());
  65. 							// }
  66. 							originalExpiration = entrys.get("original-expiration").toString();
  67. 						}
  68. 					}
  69. 					System.out.println(" [x] Received '" + envelope.getRoutingKey() + "':'" + message + "'" + "time" + System.currentTimeMillis());
  70. 					HttpClient httpClient = new DefaultHttpClient();
  71. 					HttpPost post = new HttpPost(message);
  72. 					HttpResponse response = httpClient.execute(post);
  73. 					BufferedReader inreader = null;
  74. 					if (response.getStatusLine().getStatusCode() == 200) {
  75. 						inreader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
  76. 						StringBuffer responseBody = new StringBuffer();
  77. 						String line = null;
  78. 						while ((line = inreader.readLine()) != null) {
  79. 							responseBody.append(line);
  80. 						}
  81. 						if (!responseBody.equals("success")) {
  82. 							// putDeclre15s(message);
  83. 							if (originalExpiration.equals("0")) {
  84. 								putDeclreQueue(message, 3000, QU_declare_15S);
  85. 							}
  86. 							if (originalExpiration.equals("3000")) {
  87. 								putDeclreQueue(message, 30000, QU_declare_15S);
  88. 							}
  89. 							if (originalExpiration.equals("30000")) {
  90. 								putDeclreQueue(message, 60000, QU_declare_15S);
  91. 							}
  92. 							if (originalExpiration.equals("60000")) {
  93. 								putDeclreQueue(message, 120000, QU_declare_15S);
  94. 							}
  95. 							if (originalExpiration.equals("120000")) {
  96. 								putDeclreQueue(message, 180000, QU_declare_15S);
  97. 							}
  98. 							if (originalExpiration.equals("180000")) {
  99. 								putDeclreQueue(message, 300000, QU_declare_15S);
  100. 							}
  101. 							if (originalExpiration.equals("300000")) {
  102. //								channel.basicConsume(QU_declare_300S,true, this);
  103. 								System.out.println("finish notify");
  104. 							}
  105. 						}
  106. 					} else {
  107. 						System.out.println(response.getStatusLine().getStatusCode());
  108. 					}
  109. 				}
  110. 			};
  111.  
  112. 			channel.basicConsume(queueName, true, consumer);
  113. 		} catch (Exception e) {
  114. 			e.printStackTrace();
  115. 		} finally {
  116. 		}
  117. 	}
  118.  
  119.  
  120.  
  121. 	static Map<String, Object> xdeathMap = new HashMap<String, Object>();
  122. 	static List<Map<String, Object>> xDeath = new ArrayList<Map<String, Object>>();
  123. 	static Map<String, Object> xdeathParam = new HashMap<String, Object>();
  124.  
  125. 	public static void putDeclre15s(String message) throws IOException {
  126. 		channel.exchangeDeclare(EX_declare_15S, "topic");
  127. 		Map<String, Object> args = new HashMap<String, Object>();
  128. 		args.put("x-dead-letter-exchange", EXCHANGE_NAME);// 死信exchange
  129. 		AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
  130. 		builder.expiration("3000").deliveryMode(2);// 设置消息TTL
  131. 		AMQP.BasicProperties properties = builder.build();
  132. 		channel.queueDeclare(QU_declare_15S, false, false, false, args);
  133. 		channel.queueBind(QU_declare_15S, EX_declare_15S, ROUTINGKEY);
  134. 		channel.basicPublish(EX_declare_15S, ROUTINGKEY, properties, message.getBytes());
  135. 		System.out.println("send message in QA_DEFERRED_15S" + message + "time" + System.currentTimeMillis());
  136. 	}
  137.  
  138. 	public static void putDeclreQueue(String message, int mis, String queue) throws IOException {
  139. 		channel.exchangeDeclare(EX_declare_15S, "topic");
  140. 		Map<String, Object> args = new HashMap<String, Object>();
  141. 		args.put("x-dead-letter-exchange", EXCHANGE_NAME);// 死信exchange
  142. 		AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
  143. 		builder.expiration(String.valueOf(mis)).deliveryMode(2);// 设置消息TTL
  144. 		AMQP.BasicProperties properties = builder.build();
  145. 		channel.queueDeclare(queue, false, false, false, args);
  146. 		channel.queueBind(queue, EX_declare_15S, ROUTINGKEY);
  147. 		channel.basicPublish(EX_declare_15S, ROUTINGKEY, properties, message.getBytes());
  148. 		System.out.println("send message in " + queue + message + "time============" + System.currentTimeMillis());
  149. 	}
  150.  
  151. 	public static void main(String args[]) throws Exception {
  152. 		init();
  153. 		consume();
  154. 	}
  155. }
消息通过dlx转发的情况下，header头部会带有x-death的一个数组，里面包含消息的各项属性，比如说消息成为死信的原因reason，original-expiration这个字段表示消息在原来队列中的过期时间，根据这个值来确定下一次通知的延迟时间应该是多少秒。
运行结果如下：




posted @ 2018-11-05 14:05  星朝  阅读(2197)  评论(1)  编辑  收藏  举报