org.eclipse.viatra.integration.mwe2.mwe2impl

Class MessageBroker

java.lang.Object

org.eclipse.viatra.integration.mwe2.mwe2impl.MessageBroker

All Implemented Interfaces:

IMessageBroker

public class MessageBroker
extends java.lang.Object
implements IMessageBroker

The MessageBroker is a singleton class that manages topics and subscriptions.

Field Summary

Fields

Modifier and Type	Field and Description
protected static MessageBroker	broker
protected java.util.List<ITopic>	topics

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MessageBroker()

Method Summary

Modifier and Type	Method and Description
static MessageBroker	getInstance()
java.util.List<IMessage<?>>	getMessages(java.lang.String topicName, ITransformationStep step) Returns all messages sent to a topic that have not been processed by the specified transformation step.
protected ITopic	getTopic(java.lang.String topicName)
void	removeMessage(java.lang.String topicName, ITransformationStep step, IMessage<?> message) Removes the specified message from the specified topic and the specified subscriber queue.
protected void	removeTopic(java.lang.String topicName)
void	sendMessage(java.lang.String topicName, IMessage<?> message) Send the specified message to the topic whose name is matching the @param topicName parameter.
void	subscribeTo(java.lang.String topicName, ITransformationStep step) Subscribes the given transformation step to the Topic whose name matches the @param topicName parameter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

broker

protected static MessageBroker broker

topics

protected java.util.List<ITopic> topics

Constructor Detail

MessageBroker

protected MessageBroker()

Method Detail

getInstance

public static MessageBroker getInstance()

subscribeTo

public void subscribeTo(java.lang.String topicName,
                        ITransformationStep step)

Description copied from interface: IMessageBroker

Subscribes the given transformation step to the Topic whose name matches the @param topicName parameter.

Specified by:

subscribeTo in interface IMessageBroker

sendMessage

public void sendMessage(java.lang.String topicName,
                        IMessage<?> message)

Description copied from interface: IMessageBroker

Send the specified message to the topic whose name is matching the @param topicName parameter.

Specified by:

sendMessage in interface IMessageBroker

getMessages

public java.util.List<IMessage<?>> getMessages(java.lang.String topicName,
                                               ITransformationStep step)

Returns all messages sent to a topic that have not been processed by the specified transformation step.

Specified by:

getMessages in interface IMessageBroker

removeMessage

public void removeMessage(java.lang.String topicName,
                          ITransformationStep step,
                          IMessage<?> message)

Removes the specified message from the specified topic and the specified subscriber queue. It can be used to inform the broker and the topic that the given transformation step has finished processing the specified message, and therefore it is no longer needed.

Specified by:

removeMessage in interface IMessageBroker

getTopic

protected ITopic getTopic(java.lang.String topicName)

removeTopic

protected void removeTopic(java.lang.String topicName)