com.neeve.service

Interface MessageHandler<I,O,R>

All Known Implementing Classes:

AbstractApp.AlertRequestHandler, AbstractApp.HeartbeatRequestHandler, AbstractApp.LogoutRequestHandler, AbstractApp.PostMessageProcessingTimesRequestHandler

public interface MessageHandler<I,O,R>

Defines a message handler.

There are two types of message handlers implemented by the service - local or remote. Local handlers are those that operate purely on state local to the service i.e. they operate purely on the service's in-memory repository. Remote handlers are effectively proxies to long-running back-end methods and do not use and update local service state.

A message handler reports its type via the getType() and accepts messages for processing via the handle(java.lang.String, I, O, R) method.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	MessageHandler.Type Enumerates the handler types

Method Summary

Modifier and Type	Method and Description
MessageHandler.Type	getType() Return the type of a handler.
MessageView	handle(String origin, I message, O response, R repository) The message handler.

Method Detail

getType

MessageHandler.Type getType()

Return the type of a handler.

handle

MessageView handle(String origin,
                   I message,
                   O response,
                   R repository)
            throws Exception

The message handler.

Parameters:

origin - The message origin (client)

message - The message to handle.

response - The message's response message. Non-null only for request messages.

repository - The service repository. Non-null only for local handlers.

Throws:

Exception