我正在研究将Websphere MQ用作火花流的数据源的可能性,因为在我们的一个用例中需要它。我知道MQTT是支持从MQ数据结构进行通信的协议,但是由于我是引发流传输的新手,因此我需要一些适用的示例。是否有人尝试将MQ与Spark Streaming连接起来。请设计最佳方法。
所以,我在这里发布CustomMQReceiver的工作代码,该代码连接Websphere MQ并读取数据:
public class CustomMQReciever extends Receiver<String> { String host = null;
int port = -1;
String qm=null;
String qn=null;
String channel=null;
transient Gson gson=new Gson();
transient MQQueueConnection qCon= null;
Enumeration enumeration =null;
public CustomMQReciever(String host , int port, String qm, String channel, String qn) {
super(StorageLevel.MEMORY_ONLY_2());
this.host = host;
this.port = port;
this.qm=qm;
this.qn=qn;
this.channel=channel;
}
public void onStart() {
// Start the thread that receives data over a connection
new Thread() {
@Override public void run() {
try {
initConnection();
receive();
}
catch (JMSException ex)
{
ex.printStackTrace();
}
}
}.start();
}
public void onStop() {
// There is nothing much to do as the thread calling receive()
// is designed to stop by itself isStopped() returns false
}
/** Create a MQ connection and receive data until receiver is stopped */
private void receive() {
System.out.print("Started receiving messages from MQ");
try {
JMSMessage receivedMessage= null;
while (!isStopped() && enumeration.hasMoreElements() )
{
receivedMessage= (JMSMessage) enumeration.nextElement();
String userInput = convertStreamToString(receivedMessage);
//System.out.println("Received data :'" + userInput + "'");
store(userInput);
}
// Restart in an attempt to connect again when server is active again
//restart("Trying to connect again");
stop("No More Messages To read !");
qCon.close();
System.out.println("Queue Connection is Closed");
}
catch(Exception e)
{
e.printStackTrace();
restart("Trying to connect again");
}
catch(Throwable t) {
// restart if there is any other error
restart("Error receiving data", t);
}
}
public void initConnection() throws JMSException
{
MQQueueConnectionFactory conFactory= new MQQueueConnectionFactory();
conFactory.setHostName(host);
conFactory.setPort(port);
conFactory.setTransportType(JMSC.MQJMS_TP_CLIENT_MQ_TCPIP);
conFactory.setQueueManager(qm);
conFactory.setChannel(channel);
qCon= (MQQueueConnection) conFactory.createQueueConnection();
MQQueueSession qSession=(MQQueueSession) qCon.createQueueSession(false, 1);
MQQueue queue=(MQQueue) qSession.createQueue(qn);
MQQueueBrowser browser = (MQQueueBrowser) qSession.createBrowser(queue);
qCon.start();
enumeration= browser.getEnumeration();
}
@Override
public StorageLevel storageLevel() {
return StorageLevel.MEMORY_ONLY_2();
}
}
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