org.lsst.ccs.messaging.jms

Class JMSBusMessagingLayer

java.lang.Object

org.lsst.ccs.messaging.jms.JMSBusMessagingLayer

All Implemented Interfaces:

Closeable, AutoCloseable, BusMessagingLayer, MessagingLayer

public class JMSBusMessagingLayer
extends Object
implements BusMessagingLayer

Constructor Summary

Constructors

Constructor and Description
JMSBusMessagingLayer()

Method Summary

Modifier and Type	Method and Description
void	addMessageListener(String agentName, BusMessageForwarder forwarder, Bus... buses) Sets up callback configuration for a topic and subsystem.
void	close() Close the Transport Layer.
void	closeFor(String agentName, Bus... buses) close entry points for a bus for an agent.
void	connect(MessagingAccessLayer layer) Connects a MessagingAccessLayer object on the buses by using its name as a unique identifier.
void	disconnect(MessagingAccessLayer layer) Remove the entry point to the buses for the given MessagingAccessLayer.
Set<String>	getRegisteredLocalAgents(Bus... buses) Get the list of local agents currently connected to the buses.
void	register(String agentName, Bus... buses) Creates low level communication entry points for a subsystem.
void	removeMessageListener(String agentName, BusMessageForwarder forwarder, Bus... buses) Removes a message listener from the forwarder list.
<T extends BusMessage> void	sendMessage(String senderAgent, Bus bus, T message) Sends a message on a bus for a given MessagingAccessLayer.
<T extends BusMessage> void	sendMessageToDestination(javax.jms.Session s, T message, String dest, javax.jms.MessageProducer send, Bus bus)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.lsst.ccs.messaging.BusMessagingLayer

getRegisteredLocalAgents, parseDestination

Constructor Detail

JMSBusMessagingLayer

public JMSBusMessagingLayer()

Method Detail

connect

public void connect(MessagingAccessLayer layer)
             throws DuplicateAgentNameException

Description copied from interface: MessagingLayer

Connects a MessagingAccessLayer object on the buses by using its name as a unique identifier. Upon creation, if needed, all needed buses are created. Depending on the underlying implementation, the MessagingLayer allows this method to be called more than once, or throws a RuntimeException. TBD : should all the buses be created or just the ones specified by the MessagingAccessLayer ?

Specified by:

connect in interface MessagingLayer

Parameters:

layer - The layer to be connected on the buses

Throws:

DuplicateAgentNameException - if the name of MessagingAccessLayer is not unique on the buses

disconnect

public void disconnect(MessagingAccessLayer layer)

Description copied from interface: MessagingLayer

Remove the entry point to the buses for the given MessagingAccessLayer. At this point, the CCS buses might be closed.

Specified by:

disconnect in interface MessagingLayer

Parameters:

layer - The layer to be connected on the buses

close

public void close()
           throws IOException

Description copied from interface: BusMessagingLayer

Close the Transport Layer. Subsequent method calls will have no effect.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface BusMessagingLayer

Throws:

IOException

addMessageListener

public void addMessageListener(String agentName,
                               BusMessageForwarder forwarder,
                               Bus... buses)

Description copied from interface: BusMessagingLayer

Sets up callback configuration for a topic and subsystem. There could be multiple Forwarder for a given bus. All callbacks are supposed to be multithreaded

Specified by:

addMessageListener in interface BusMessagingLayer

Parameters:

agentName - if empty adds a forwarder to "anonymous" agent that receives all messages

forwarder - code that handles the incoming messages

buses - if empty the forwarder listens to all buses.

getRegisteredLocalAgents

public Set<String> getRegisteredLocalAgents(Bus... buses)

Description copied from interface: BusMessagingLayer

Get the list of local agents currently connected to the buses.

Specified by:

getRegisteredLocalAgents in interface BusMessagingLayer

Parameters:

buses - The buses for which we are seeking the connected agents. If empty it will report agents connected to all buses.

Returns:

The List of registered buses.

closeFor

public void closeFor(String agentName,
                     Bus... buses)

Description copied from interface: BusMessagingLayer

close entry points for a bus for an agent. calls should be idempotent.

Specified by:

closeFor in interface BusMessagingLayer

Parameters:

agentName - (if empty voids the "anonymous" agent capabilities

buses - if empty all registered buses for the agent will be closed

sendMessage

public <T extends BusMessage> void sendMessage(String senderAgent,
                                               Bus bus,
                                               T message)

Description copied from interface: MessagingLayer

Sends a message on a bus for a given MessagingAccessLayer. The name of the MessagingAccessLayer determines the origin of the bus message. note : that BusMessage should have sender and destination information but it is not the role of the communication layer to parse destination information such as "subsystem1, subsystem2" or "subsystem3/module"a.

Specified by:

sendMessage in interface MessagingLayer

Type Parameters:

T - the type of message sent on the bus

Parameters:

senderAgent - provides the name as the origin of the message

bus - the bus on which to send the message

message - the message

sendMessageToDestination

public <T extends BusMessage> void sendMessageToDestination(javax.jms.Session s,
                                                            T message,
                                                            String dest,
                                                            javax.jms.MessageProducer send,
                                                            Bus bus)

removeMessageListener

public void removeMessageListener(String agentName,
                                  BusMessageForwarder forwarder,
                                  Bus... buses)

Description copied from interface: BusMessagingLayer

Removes a message listener from the forwarder list.

Specified by:

removeMessageListener in interface BusMessagingLayer

buses - if empty forwarder is removed from all buses

register

public void register(String agentName,
                     Bus... buses)
              throws IOException

Description copied from interface: BusMessagingLayer

Creates low level communication entry points for a subsystem. Abstract vision is that there is a different entry point for each bus/topic.

Specified by:

register in interface BusMessagingLayer

Parameters:

agentName - name of the sending/receiving point as will be known by transport null or empty string means that the local agent will receive all messages (whatever the destination of the message is : "anonymous agent") if an agent with same name is already locally registered for these buses nothing happens (the call is idempotent), but if another agent has the same name on the network a DuplicateBusNameException may be fired (this is an optional behaviour) but this exception is reported only to the corresponding BusMembershipListener

buses - list of buses we want to connect to, if empty connects to all buses

Throws:

IOException - if connection impossible,