/*
* Initiate the snapshot by sending a Marker message to one of the Players (Player0)
* Any Player could have been used to initiate the snapshot.
*/
private void sendInitSnapshot() {
try {
// Gather necessary JMS resources
Context ctx = new InitialContext();
ConnectionFactory cf = (ConnectionFactory) ctx.lookup("jms/myConnectionFactory");
Queue q = (Queue) ctx.lookup("jms/PITplayer0");
Connection con = cf.createConnection();
Session session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer writer = session.createProducer(q);
/*
* As part of the snapshot algorithm, players need to record
* what other Players they receive markers from.
* "-1" indicates to the PITplayer0 that this marker is coming from
* the monitor, not another Player.
*/
Marker m = new Marker(-1);
ObjectMessage msg = session.createObjectMessage(m);
System.out.println("Initiating Snapshot");
writer.send(msg);
con.close();
} catch (JMSException e) {
System.out.println("JMS Exception thrown" + e);
} catch (Throwable e) {
System.out.println("Throwable thrown" + e);
}
}
@Override
public void info(long lectureWrapperId) {
InfoLectureWrapperDTO infoLectureWrapperDTO = new InfoLectureWrapperDTO(lectureWrapperId);
try {
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
ObjectMessage objectMessage = session.createObjectMessage(infoLectureWrapperDTO);
session.createProducer(serverQueue).send(objectMessage);
} catch (JMSException e) {
e.printStackTrace();
}
}
public boolean send(@NotNull Value value, @Optional JMSQueue replyTo) throws JMSException {
Message message = null;
if (value.isArray()) {
message = _session.createMapMessage();
ArrayValue array = (ArrayValue) value;
Set<Map.Entry<Value, Value>> entrySet = array.entrySet();
for (Map.Entry<Value, Value> entry : entrySet) {
if (entry.getValue() instanceof BinaryValue) {
byte[] bytes = ((BinaryValue) entry.getValue()).toBytes();
((MapMessage) message).setBytes(entry.getKey().toString(), bytes);
} else {
// every primitive except for bytes can be translated from a string
((MapMessage) message).setString(entry.getKey().toString(), entry.getValue().toString());
}
}
} else if (value instanceof BinaryValue) {
message = _session.createBytesMessage();
byte[] bytes = ((BinaryValue) value).toBytes();
((BytesMessage) message).writeBytes(bytes);
} else if (value.isLongConvertible()) {
message = _session.createStreamMessage();
((StreamMessage) message).writeLong(value.toLong());
} else if (value.isDoubleConvertible()) {
message = _session.createStreamMessage();
((StreamMessage) message).writeDouble(value.toDouble());
} else if (value.toJavaObject() instanceof String) {
message = _session.createTextMessage();
((TextMessage) message).setText(value.toString());
} else if (value.toJavaObject() instanceof Serializable) {
message = _session.createObjectMessage();
((ObjectMessage) message).setObject((Serializable) value.toJavaObject());
} else {
return false;
}
if (replyTo != null) message.setJMSReplyTo(replyTo._destination);
_producer.send(message);
return true;
}
void sendMessage(String cmd, Map<String, String> paramMap) throws JMSException {
Destination destination = session.createQueue(this.queueName);
JSONObject json = new JSONObject();
json.put("cmd", cmd);
for (String name : paramMap.keySet()) {
json.put(name, paramMap.get(name));
}
System.out.println(
"sending user JMS message with payload:"
+ json.toString(2)
+ " to queue:"
+ this.queueName);
Message message = session.createObjectMessage(json.toString());
this.producer.send(destination, message);
}
public static void publish(String dest, Serializable object, String contentType, String tag)
throws Exception {
Connection conn = connectionFactory.createConnection();
try {
Session session = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
Destination destination = createDestination(dest);
MessageProducer producer = session.createProducer(destination);
ObjectMessage message = session.createObjectMessage();
if (contentType != null) {
message.setStringProperty(HttpHeaderProperty.CONTENT_TYPE, contentType);
}
if (tag != null) {
message.setStringProperty("MyTag", tag);
}
message.setObject(object);
producer.send(message);
} finally {
conn.close();
}
}
public static Message createMessage(Session session, Class messageClazz) throws JMSException {
if (session == null) {
throw new JMSException("session cannot be null");
}
if (Message.class.isAssignableFrom(messageClazz)) {
throw new JMSException("cannot create message of type: " + messageClazz.getName());
}
if (TextMessage.class.equals(messageClazz)) {
return session.createTextMessage();
} else if (StreamMessage.class.equals(messageClazz)) {
return session.createStreamMessage();
} else if (MapMessage.class.equals(messageClazz)) {
return session.createMapMessage();
} else if (ObjectMessage.class.equals(messageClazz)) {
return session.createObjectMessage();
} else if (BytesMessage.class.equals(messageClazz)) {
return session.createBytesMessage();
} else if (Message.class.equals(messageClazz)) {
return session.createMessage();
} else {
throw new JMSException("cannot create message of type: " + messageClazz.getName());
}
}
