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。
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。
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。
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package org.delayQueue;
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import com.rabbitmq.client.BuiltinExchangeType;
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import com.rabbitmq.client.Channel;
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import com.rabbitmq.client.Connection;
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import com.rabbitmq.client.ConnectionFactory;
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public class DeclareQueue {
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public static String EXCHANGE_NAME = "notifyExchange";
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public static void init() {
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost("localhost");
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factory.setPort(5672);
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Connection connection = null;
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try {
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connection = factory.newConnection();
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Channel channel = connection.createChannel();
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channel.exchangeDeclare(EXCHANGE_NAME, BuiltinExchangeType.TOPIC);
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String routingKey = "AliPaynotify";
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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";
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channel.basicPublish(EXCHANGE_NAME, routingKey, null, message.getBytes());
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System.out.println(" [x] Sent :" + message);
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} finally {
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if (connection != null) {
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try {
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connection.close();
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} catch (Exception ignore) {
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}
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}
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}
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}
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public static void main(String args[]) {
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init();
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}
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}
DeclareConsumer.java
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package org.delayQueue;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import org.apache.http.HttpResponse;
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import org.apache.http.client.ClientProtocolException;
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import org.apache.http.client.HttpClient;
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import org.apache.http.client.methods.HttpPost;
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import org.apache.http.impl.client.DefaultHttpClient;
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import com.rabbitmq.client.AMQP;
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import com.rabbitmq.client.Channel;
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import com.rabbitmq.client.Connection;
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import com.rabbitmq.client.ConnectionFactory;
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import com.rabbitmq.client.Consumer;
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import com.rabbitmq.client.DefaultConsumer;
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import com.rabbitmq.client.Envelope;
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public class DeclareConsumer {
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public static String EXCHANGE_NAME = "notifyExchange";
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public static String QU_declare_15S = "Qu_declare_15s";
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public static String EX_declare_15S = "EX_declare_15s";
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public static String ROUTINGKEY = "AliPaynotify";
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public static Connection connection = null;
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public static Channel channel = null;
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public static Channel DECLARE_15S_CHANNEL = null;
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public static String declare_queue = "init";
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public static String originalExpiration = "0";
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public static void init() throws Exception {
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ConnectionFactory factory = new ConnectionFactory();
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factory.setHost("localhost");
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factory.setPort(5672);
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connection = factory.newConnection();
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channel = connection.createChannel();
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DECLARE_15S_CHANNEL = connection.createChannel();
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}
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public static void consume() {
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try {
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channel.exchangeDeclare(EXCHANGE_NAME, "topic");
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final String queueName = channel.queueDeclare().getQueue();
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channel.queueBind(queueName, EXCHANGE_NAME, ROUTINGKEY);
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System.out.println(" [*] Waiting for messages. To exit press CTRL+C");
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final Consumer consumer = new DefaultConsumer(channel) {
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@Override
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public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
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String message = new String(body, "UTF-8");
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Map<String, Object> headers = properties.getHeaders();
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if (headers != null) {
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List<Map<String, Object>> xDeath = (List<Map<String, Object>>) headers.get("x-death");
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System.out.println("xDeath--- > " + xDeath);
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if (xDeath != null && !xDeath.isEmpty()) {
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Map<String, Object> entrys = xDeath.get(0);
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// for(Entry<String, Object>
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// entry:entrys.entrySet()){
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// System.out.println(entry.getKey()+":"+entry.getValue());
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// }
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originalExpiration = entrys.get("original-expiration").toString();
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}
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}
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System.out.println(" [x] Received '" + envelope.getRoutingKey() + "':'" + message + "'" + "time" + System.currentTimeMillis());
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HttpClient httpClient = new DefaultHttpClient();
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HttpPost post = new HttpPost(message);
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HttpResponse response = httpClient.execute(post);
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BufferedReader inreader = null;
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if (response.getStatusLine().getStatusCode() == 200) {
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inreader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
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StringBuffer responseBody = new StringBuffer();
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String line = null;
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while ((line = inreader.readLine()) != null) {
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responseBody.append(line);
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}
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if (!responseBody.equals("success")) {
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// putDeclre15s(message);
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if (originalExpiration.equals("0")) {
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putDeclreQueue(message, 3000, QU_declare_15S);
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}
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if (originalExpiration.equals("3000")) {
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putDeclreQueue(message, 30000, QU_declare_15S);
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}
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if (originalExpiration.equals("30000")) {
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putDeclreQueue(message, 60000, QU_declare_15S);
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}
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if (originalExpiration.equals("60000")) {
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putDeclreQueue(message, 120000, QU_declare_15S);
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}
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if (originalExpiration.equals("120000")) {
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putDeclreQueue(message, 180000, QU_declare_15S);
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}
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if (originalExpiration.equals("180000")) {
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putDeclreQueue(message, 300000, QU_declare_15S);
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}
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if (originalExpiration.equals("300000")) {
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// channel.basicConsume(QU_declare_300S,true, this);
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System.out.println("finish notify");
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}
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}
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} else {
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System.out.println(response.getStatusLine().getStatusCode());
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}
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}
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};
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channel.basicConsume(queueName, true, consumer);
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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}
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}
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static Map<String, Object> xdeathMap = new HashMap<String, Object>();
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static List<Map<String, Object>> xDeath = new ArrayList<Map<String, Object>>();
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static Map<String, Object> xdeathParam = new HashMap<String, Object>();
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public static void putDeclre15s(String message) throws IOException {
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channel.exchangeDeclare(EX_declare_15S, "topic");
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Map<String, Object> args = new HashMap<String, Object>();
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args.put("x-dead-letter-exchange", EXCHANGE_NAME);// 死信exchange
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AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
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builder.expiration("3000").deliveryMode(2);// 设置消息TTL
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AMQP.BasicProperties properties = builder.build();
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channel.queueDeclare(QU_declare_15S, false, false, false, args);
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channel.queueBind(QU_declare_15S, EX_declare_15S, ROUTINGKEY);
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channel.basicPublish(EX_declare_15S, ROUTINGKEY, properties, message.getBytes());
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System.out.println("send message in QA_DEFERRED_15S" + message + "time" + System.currentTimeMillis());
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}
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public static void putDeclreQueue(String message, int mis, String queue) throws IOException {
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channel.exchangeDeclare(EX_declare_15S, "topic");
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Map<String, Object> args = new HashMap<String, Object>();
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args.put("x-dead-letter-exchange", EXCHANGE_NAME);// 死信exchange
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AMQP.BasicProperties.Builder builder = new AMQP.BasicProperties.Builder();
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builder.expiration(String.valueOf(mis)).deliveryMode(2);// 设置消息TTL
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AMQP.BasicProperties properties = builder.build();
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channel.queueDeclare(queue, false, false, false, args);
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channel.queueBind(queue, EX_declare_15S, ROUTINGKEY);
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channel.basicPublish(EX_declare_15S, ROUTINGKEY, properties, message.getBytes());
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System.out.println("send message in " + queue + message + "time============" + System.currentTimeMillis());
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}
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public static void main(String args[]) throws Exception {
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init();
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consume();
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}
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}
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。