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- to send and receive messages
- to add an order to a JobScheduler job chain as an example XML command JS7 workflow as an JS7 JOC API call with a JSON body extracted from a message.
A separate implementation is used to send the XML command API call - JobScheduler JS7 libraries are not needed for the example.
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- Creation of a message producer to send messages to a Message Queue server (MQ server).
- Creation of a message consumer to receive messages from an MQ server.
- Sending the message to a JobSchedulerJS7 JOC API.
The message has to be an XML a JSON snippet to be processed by the desired JobSchedulerJS7 JOC API. This snippet must be valid XML JSON and compliant with the JobScheduler XML Schema JOC API.
Most of the implementation work is done with the standard JMS implementation of Java. The only class from the Active MQ implementation is the ActiveMQConnectionFactory class. It shouldn´t be too complex to change the implementation to the ConnectionFactory of your desired message queue service.
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A zip file of this example as a complete maven project implementation is available: activejms-example-mqjs7-exampleproject.zip.
Prerequisites
- A running Message Queue server (The example uses Apache Active MQ)
- A running JobSchedulerJS7 Controller, Agent and JOC Cockpit.
- Maven (only needed if you want to build the example as a maven project)
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package com.sos.jms.producer;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageProducer;
import javax.jms.Session;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.log4j.Logger;
public class SOSProducer {
private static final String DEFAULT_CONNECTION_URI = "tcp://[HOSTNAME]:61616";
private static final Logger LOGGER = Logger.getLogger(SOSProducer.class);
private static final String QUEUE_NAME = "test_queue";
private static final String DEFAULT_TEXT = "<add_order job_chain='[FOLDERNAME]/[JOBCHAINNAME]' at='now'>"
+ "<params>"
+ "<param name='host' value='[HOST]'/>"
+ "<param name='port' value='22'/>"
+ "<param name='user' value='[USERNAME]'/>"
+ "<param name='auth_method' value='password'/>"
+ "<param name='password' value='[PASSWORD]'/>"
+ "<param name='command' value='echo command send over MessageQueue!'/>"
+ "</params>"
+ "</add_order>"{\"controllerId\":\"testsuite\",\"orders\":[{\"workflowPath\":\"/JS7Demo/01_HelloWorld/jdHelloWorld\",\"scheduledFor\":\"now\"}],\"auditLog\":{}}";
private Connection createConnection(){
return this.createConnection(DEFAULT_CONNECTION_URI);
}
public Connection createConnection(String uri){
ConnectionFactory factory = new ActiveMQConnectionFactory(uri);
Connection connection = null;
try {
connection = factory.createConnection();
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to connect: " , e);
}
return connection;
}
private Session createSession(Connection connection){
Session session = null;
try {
session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to create Session: " , e);
}
return session;
}
private Destination createDestination(Session session, String queueName){
Destination destination = null;
try {
destination = session.createQueue(queueName);
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to create Destination: " , e);
}
return destination;
}
private MessageProducer createMessageProducer(Session session, Destination destination){
MessageProducer producer = null;
try {
producer = session.createProducer(destination);
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to create MessageProducer: " , e);
}
return producer;
}
public void write(String text){
Connection connection = createConnection();
Session session = createSession(connection);
Destination destination = createDestination(session);
MessageProducer producer = createMessageProducer(session, destination);
Message message = null;
try {
if(text != null){
message = session.createTextMessage(text);
} else{
message = session.createTextMessage(DEFAULT_TEXT);
}
producer.send(message);
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to write Message to Destination: " , e);
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
LOGGER.error("JMSException occurred while trying to close the connection: " , e);
}
}
}
}
} |
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