org.lsst.ccs.bus.jgroups
Class JGroupsBusMessagingLayer

java.lang.Object
  org.lsst.ccs.bus.jgroups.JGroupsBusMessagingLayer

All Implemented Interfaces:

Closeable, BusMessagingLayer

public class JGroupsBusMessagingLayer
extends Object
implements BusMessagingLayer

Each Bus is represented by a JGroups cluster.

Each agent creates a JChannel, setName to name of agent and connect to corresponding Bus/cluster (so each agent may have up to 3 JChannel connected).
Each of these 3 channels have a JGroups Address.

for sending messages to an agent we have to find its Address in the group AND we have to find the addresses of the multiple anonymous agents that will receive a copy

There is a dictionary to match agent name to jGroups Address. for each agent there is an Address except for anonymous agent that can be matched to multiple adresses.

ImPortant every Jchannel in the JVM MUST be closed!

Field Summary

static String	DEFAULT_TCP_PROPERTIES
static String	DEFAULT_TCP_PROTOCOL
static String	DEFAULT_UDP_PROPERTIES
static String	DEFAULT_UDP_PROTOCOL

Fields inherited from interface org.lsst.ccs.bus.BusMessagingLayer

ANONYMOUS_AGENT

Constructor Summary

JGroupsBusMessagingLayer()
Deprecated.

Method Summary

void	addMessageListener(String agentName, BusMessageForwarder forwarder, Bus... buses)
void	close()
void	closeFor(String agentName, Bus... buses)
void	register(String agentName, Bus... buses)
void	removeMessageListener(String agentName, BusMessageForwarder forwarder, Bus... buses)
<T extends BusPayload> void	sendMessage(String senderAgent, Bus<T> bus, T message, String... destinations)
void	setMembershipListener(BusMembershipListener listener, Bus... buses)

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_UDP_PROTOCOL

public static final String DEFAULT_UDP_PROTOCOL

See Also:

Constant Field Values

DEFAULT_UDP_PROPERTIES

public static final String DEFAULT_UDP_PROPERTIES

See Also:

Constant Field Values

DEFAULT_TCP_PROTOCOL

public static final String DEFAULT_TCP_PROTOCOL

See Also:

Constant Field Values

DEFAULT_TCP_PROPERTIES

public static final String DEFAULT_TCP_PROPERTIES

See Also:

Constant Field Values

Constructor Detail

JGroupsBusMessagingLayer

@Deprecated
public JGroupsBusMessagingLayer()

Deprecated.

there should be only one instance perJVM: it's up to the calling code to check that.

Method Detail

register

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

Specified by:

register in interface BusMessagingLayer

Throws:

IOException

closeFor

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

Specified by:

closeFor in interface BusMessagingLayer

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface BusMessagingLayer

Throws:

IOException

sendMessage

public <T extends BusPayload> void sendMessage(String senderAgent,
                                               Bus<T> bus,
                                               T message,
                                               String... destinations)
                 throws IOException

Specified by:

sendMessage in interface BusMessagingLayer

Throws:

IOException

addMessageListener

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

Specified by:

addMessageListener in interface BusMessagingLayer

removeMessageListener

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

Specified by:

removeMessageListener in interface BusMessagingLayer

setMembershipListener

public void setMembershipListener(BusMembershipListener listener,
                                  Bus... buses)

Specified by:

setMembershipListener in interface BusMessagingLayer