Package org.lsst.ccs.messaging

Package defining the CCS Messaging interfaces.

See: Description

Interface Summary

Interface	Description
AgentPresenceListener	Agents that implement this interface are notified when an agent is connecting or has disconnected on the status bus
BusMessageForwarder<T extends BusMessage>	A BusMessageForwarder receives a BusMessage from the transport layer and passes it to registered MessageListener.
BusMessagingLayer	Interface defining the access to the Transport Layer of Buses
CommandExecutor	The Command executor receives a command and executes it.
CommandMessageListener	Interface to be implemented by listeners that wish to be notified of messages received on the command bus.
CommandOriginator	Originator of a command.
LogMessageListener	Interface to be implemented by listeners that wish to be notified of messages received on the LOG bus.
MessageListener	Marker interface to be implemented by bus message listeners.
MessagingLayer	Interface providing methods to connect/disconnect MessagingAccessLayer objects to/from the CCS buses and to send messages over the buses.
MessagingManager	Manages the creation of the messaging layer implementations.
ProvidesDisconnectionInformation	This marker interface indicates that a BusMessagingLayer is able to provide information on agent disconnection, in a more efficient way than the AgentPresenceManager
StateBundleAggregator.Observer
StatusMessageListener	Interface to be implemented by listeners that wish to be notified of messages received on the status bus.

Class Summary

Class	Description
AgentMessagingLayer	This interface provides messaging methods for a component (eg an agent) to be able to communicate on the buses.
AgentPresenceManager	Tracks agent connection and disconnection on the buses.
BusMessageFilter	Deprecated
BusMessageFilterFactory
ConcurrentMessagingUtils	Utility class to synchronously or asynchronously invoke or listen for events on the buses.
LogAggregator
LogBusHandler	A java util log Handler that forwards messages to the Log bus.
MessagingAccessLayer	Entry point for receiving messages from the buses.
MessagingAccessLayer.BusAccess<T extends BusMessage>	Handler for processing received messages.
MessagingAccessLayer.StatusBusAccess
NetworkUtilities
StateBundleAggregator
StatusAggregator	A StatusAggregator listens to the status bus and keeps track in memory of selected status data.
StatusAggregator.Statistics	Internal class, unmutable data structure with min, max, average and stddev.
StatusAggregator.TimedValue	Internal class, unmutable data structure with name, timestamp and value.
TransportManager

Exception Summary

Exception	Description
BadCommandException
CommandRejectedException	Exception thrown by utility classes to indicate that a command has been rejected.
DestinationsException
DuplicateAgentNameException	This exception is thrown when an agent tries to connect with a non unique name.
ErrorInCommandExecutionException
TransportException
TransportStateException

Package org.lsst.ccs.messaging Description

Package defining the CCS Messaging interfaces. It is built on top of the CCS Buses and it defines how messages are sent/received by the different components registered to the listen to the buses.

Author:

emarin, turri