MQTT的学习研究（十四） MQTT moquette 的 Callback API 消息发布订阅的实现

在moquette-mqtt中提供了回调callback模式的发布和订阅但是在订阅之后没有发现有消息接收的方法，参看moquette-mqtt中Block，Future式的发布订阅基础是callback式订阅发布，但是本人在研究源代码测试，发现

callback方式接收没有成功。所以本文中只是callback式的发布和订阅没有消息接收的过程，尚未查到原因。

采用Callback式 发布主题

Java代码  

1. package com.etrip.mqtt.callback;
2. import java.net.URISyntaxException;
3. import org.fusesource.hawtbuf.Buffer;
4. import org.fusesource.hawtbuf.UTF8Buffer;
5. import org.fusesource.mqtt.client.Callback;
6. import org.fusesource.mqtt.client.CallbackConnection;
7. import org.fusesource.mqtt.client.Listener;
8. import org.fusesource.mqtt.client.MQTT;
9. import org.fusesource.mqtt.client.QoS;
10. import org.fusesource.mqtt.client.Topic;
11. import org.slf4j.Logger;
12. import org.slf4j.LoggerFactory;
13. /**
14. *
15. * MQTT moquette 的Server 段用于并发布主题信息
16. *
17. * 采用Callback式 发布主题
18. *
19. * @author longgangbai
20. */
21. public class MQTTCallbackServer {
22. private static final Logger LOG = LoggerFactory.getLogger(MQTTCallbackServer.class);
23. private final static String CONNECTION_STRING = "tcp://localhost:1883";
24. private final static boolean CLEAN_START = true;
25. private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
26. public  static Topic[] topics = {
27. new Topic("china/beijing", QoS.EXACTLY_ONCE),
28. new Topic("china/tianjin", QoS.AT_LEAST_ONCE),
29. new Topic("china/henan", QoS.AT_MOST_ONCE)};
30. public final  static long RECONNECTION_ATTEMPT_MAX=6;
31. public final  static long RECONNECTION_DELAY=2000;
32. public final static int SEND_BUFFER_SIZE=2*1024*1024;//发送最大缓冲为2M
33. public static void main(String[] args)   {
34. //创建MQTT对象
35. MQTT mqtt = new MQTT();
36. try {
37. //设置mqtt broker的ip和端口
38. mqtt.setHost(CONNECTION_STRING);
39. //连接前清空会话信息
40. mqtt.setCleanSession(CLEAN_START);
41. //设置重新连接的次数
42. mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
43. //设置重连的间隔时间
44. mqtt.setReconnectDelay(RECONNECTION_DELAY);
45. //设置心跳时间
46. mqtt.setKeepAlive(KEEP_ALIVE);
47. //设置缓冲的大小
48. mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
49. //获取mqtt的连接对象BlockingConnection
50. final CallbackConnection connection = mqtt.callbackConnection();
51. //添加连接的监听事件
52. connection.listener(new Listener() {
53. public void onDisconnected() {
54. }
55. public void onConnected() {
56. }
57. public void onPublish(UTF8Buffer topic, Buffer payload, Runnable ack) {
58. // You can now process a received message from a topic.
59. // Once process execute the ack runnable.
60. ack.run();
61. System.out.println("topic"+topic.toString()+"="+new String(payload.getData()));
62. }
63. public void onFailure(Throwable value) {
64. }
65. });
66. //添加连接事件
67. connection.connect(new Callback<Void>() {
68. /**
69. * 连接失败的操作
70. */
71. public void onFailure(Throwable value) {
72. // If we could not connect to the server.
73. System.out.println("MQTTCallbackServer.CallbackConnection.connect.onFailure"+"连接失败......"+value.getMessage());
74. value.printStackTrace();
75. }
76. /**
77. * 连接成功的操作
78. * @param v
79. */
80. public void onSuccess(Void v) {
81. int count=1;
82. while(true){
83. count++;
84. // 用于发布消息，目前手机段不需要向服务端发送消息
85. //主题的内容
86. final String message="hello "+count+"chinese people !";
87. final String topic = "china/beijing";
88. System.out.println("MQTTCallbackServer  publish  topic="+topic+" message :"+message);
89. connection.publish(topic, message.getBytes(), QoS.AT_LEAST_ONCE, false, new Callback<Void>() {
90. public void onSuccess(Void v) {
91. // the pubish operation completed successfully.
92. }
93. public void onFailure(Throwable value) {
94. value.printStackTrace();
95. }
96. });
97. try {
98. Thread.sleep(2000);
99. } catch (InterruptedException e) {
100. // TODO Auto-generated catch block
101. e.printStackTrace();
102. }
103. }
104. //                  //连接断开
105. //                  connection.disconnect(new Callback<Void>() {
106. //                      public void onSuccess(Void v) {
107. //                        // called once the connection is disconnected.
108. //                          System.out.println("MQTTSubscribeClient.CallbackConnection.connect.disconnect.onSuccess", "called once the connection is disconnected.");
109. //                      }
110. //                      public void onFailure(Throwable value) {
111. //                        // Disconnects never fail.
112. //                          System.out.println("MQTTSubscribeClient.CallbackConnection.connect.disconnect.onFailure", "Disconnects never fail."+value.getMessage());
113. //                          value.printStackTrace();
114. //                      }
115. //                  });
116. }
117. });
118. Thread.sleep(10000000000L);
119. } catch (URISyntaxException e) {
120. // TODO Auto-generated catch block
121. e.printStackTrace();
122. } catch (Exception e) {
123. // TODO Auto-generated catch block
124. e.printStackTrace();
125. }finally{
126. }
127. }
128. }

采用Callback式 订阅主题

Java代码  

1. package com.etrip.mqtt.callback;
2. import java.net.URISyntaxException;
3. import org.fusesource.hawtbuf.Buffer;
4. import org.fusesource.hawtbuf.UTF8Buffer;
5. import org.fusesource.mqtt.client.Callback;
6. import org.fusesource.mqtt.client.CallbackConnection;
7. import org.fusesource.mqtt.client.Listener;
8. import org.fusesource.mqtt.client.MQTT;
9. import org.fusesource.mqtt.client.QoS;
10. import org.fusesource.mqtt.client.Topic;
11. import org.slf4j.Logger;
12. import org.slf4j.LoggerFactory;
13. /**
14. *
15. * MQTT moquette 的Client 段用于订阅主题，并接收主题信息
16. *
17. * 采用Callback式 订阅主题
18. *
19. * @author longgangbai
20. */
21. public class MQTTCallbackClient {
22. private static final Logger LOG = LoggerFactory.getLogger(MQTTCallbackClient.class);
23. private final static String CONNECTION_STRING = "tcp://localhost:1883";
24. private final static boolean CLEAN_START = true;
25. private final static short KEEP_ALIVE = 30;// 低耗网络，但是又需要及时获取数据，心跳30s
26. public  static Topic[] topics = {
27. new Topic("china/beijing", QoS.AT_MOST_ONCE),
28. new Topic("china/tianjin", QoS.AT_LEAST_ONCE),
29. new Topic("china/henan", QoS.AT_MOST_ONCE)};
30. public final  static long RECONNECTION_ATTEMPT_MAX=6;
31. public final  static long RECONNECTION_DELAY=2000;
32. final String topic = "china/beijing";
33. public final static int SEND_BUFFER_SIZE=2*1024*1024;//发送最大缓冲为2M
34. public static void main(String[] args)   {
35. //创建MQTT对象
36. MQTT mqtt = new MQTT();
37. //设置mqtt broker的ip和端口
38. try {
39. mqtt.setHost(CONNECTION_STRING);
40. } catch (URISyntaxException e1) {
41. e1.printStackTrace();
42. }
43. //连接前清空会话信息
44. mqtt.setCleanSession(CLEAN_START);
45. //设置重新连接的次数
46. mqtt.setReconnectAttemptsMax(RECONNECTION_ATTEMPT_MAX);
47. //设置重连的间隔时间
48. mqtt.setReconnectDelay(RECONNECTION_DELAY);
49. //设置心跳时间
50. mqtt.setKeepAlive(KEEP_ALIVE);
51. //设置缓冲的大小
52. mqtt.setSendBufferSize(SEND_BUFFER_SIZE);
53. //获取mqtt的连接对象CallbackConnection
54. final CallbackConnection connection= mqtt.callbackConnection();
55. try {
56. //添加连接的监听事件
57. connection.listener(new Listener() {
58. public void onDisconnected() {
59. }
60. public void onConnected() {
61. System.out.println(" 连接成功!");
62. }
63. public void onPublish(UTF8Buffer topic, Buffer payload, Runnable onComplete) {
64. }
65. public void onFailure(Throwable value) {
66. }
67. });
68. //添加连接事件
69. connection.connect(new Callback<Void>() {
70. /**
71. * 连接失败的操作
72. */
73. public void onFailure(Throwable value) {
74. // If we could not connect to the server.
75. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.onFailure  连接失败......"+value.getMessage());
76. value.printStackTrace();
77. }
78. /**
79. * 连接成功的操作
80. * @param v
81. */
82. public void onSuccess(Void v) {
83. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.onSuccess 订阅连接成功......");
84. //订阅相关的主题
85. connection.subscribe(topics, new Callback<byte[]>() {
86. public void onSuccess(byte[] qoses) {
87. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.subscribe.onSuccess 订阅主题成功......");
88. }
89. public void onFailure(Throwable value) {
90. // subscribe failed.
91. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.subscribe.onSuccess 订阅主题失败！"+value.getMessage());
92. value.printStackTrace();
93. }
94. });
95. }
96. });
97. Thread.sleep(100000000000L);
98. } catch (Exception e) {
99. // TODO Auto-generated catch block
100. e.printStackTrace();
101. }finally{
102. //            //连接断开
103. connection.disconnect(new Callback<Void>() {
104. public void onSuccess(Void v) {
105. // called once the connection is disconnected.
106. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.disconnect.onSuccess called once the connection is disconnected.");
107. }
108. public void onFailure(Throwable value) {
109. // Disconnects never fail.
110. System.out.println("MQTTSubscribeClient.CallbackConnection.connect.disconnect.onFailure  Disconnects never fail."+value.getMessage());
111. value.printStackTrace();
112. }
113. });
114. }
115. }
116. }