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
CommandOriginator	Originator of a command.
DataStatusListener
EncodedStatusListens	Marker super-interface of all interfaces describing EncodedDataStatus handling.
KeyValueStatusListener
LogMessageListener
MessageListener
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
SerializedDataStatusListener
StatusMessageListener

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	The AgentPresenceManager tracks agent connection and disconnection on the buses
BusMessageFilter	A BusMessageFilter provides methods for creating and combining filters for BusMessages.
LogBusHandler	A java util log Handler that forwards messages to the Log bus.
MessagingAccessLayer	Entry point of a CCS agent to the buses.
MessagingAccessLayer.BusAccess<T extends BusMessage>	This method is called by the underlying bus implementation when a message is received The message is then sent to the list of registered listeners
MessagingAccessLayer.StatusBusAccess
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
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