public class DemuxingIoHandler extends IoHandlerAdapter
IoHandler
that demuxes messageReceived
events
to the appropriate MessageHandler
.
You can freely register and deregister MessageHandler
s using
addReceivedMessageHandler(Class, MessageHandler)
and
removeReceivedMessageHandler(Class)
.
When message
is received through a call to
messageReceived(IoSession, Object)
the class of the
message
object will be used to find a MessageHandler
for
that particular message type. If no MessageHandler
instance can be
found for the immediate class (i.e. message.getClass()
) the
interfaces implemented by the immediate class will be searched in depth-first
order. If no match can be found for any of the interfaces the search will be
repeated recursively for the superclass of the immediate class
(i.e. message.getClass().getSuperclass()
).
Consider the following type hierarchy (Cx
are classes while
Ix
are interfaces):
C3 - I7 - I9 | | /\ | I8 I3 I4 | C2 - I5 - I6 | C1 - I1 - I2 - I4 | | | I3 ObjectWhen
message
is of type C3
this hierarchy will be
searched in the following order:
C3, I7, I8, I9, I3, I4, C2, I5, I6, C1, I1, I2, I3, I4, Object
.
For efficiency searches will be cached. Calls to
addReceivedMessageHandler(Class, MessageHandler)
and
removeReceivedMessageHandler(Class)
clear this cache.
Constructor and Description |
---|
DemuxingIoHandler()
Creates a new instance with no registered
MessageHandler s. |
Modifier and Type | Method and Description |
---|---|
<E extends java.lang.Throwable> |
addExceptionHandler(java.lang.Class<E> type,
ExceptionHandler<? super E> handler)
Registers a
MessageHandler that receives the messages of
the specified type . |
<E> MessageHandler<? super E> |
addReceivedMessageHandler(java.lang.Class<E> type,
MessageHandler<? super E> handler)
Registers a
MessageHandler that handles the received messages of
the specified type . |
<E> MessageHandler<? super E> |
addSentMessageHandler(java.lang.Class<E> type,
MessageHandler<? super E> handler)
Registers a
MessageHandler that handles the sent messages of the
specified type . |
void |
exceptionCaught(IoSession session,
java.lang.Throwable cause)
Invoked when any exception is thrown by user
IoHandler
implementation or by MINA. |
protected ExceptionHandler<java.lang.Throwable> |
findExceptionHandler(java.lang.Class<? extends java.lang.Throwable> type) |
protected MessageHandler<java.lang.Object> |
findReceivedMessageHandler(java.lang.Class<?> type) |
protected MessageHandler<java.lang.Object> |
findSentMessageHandler(java.lang.Class<?> type) |
java.util.Map<java.lang.Class<?>,ExceptionHandler<?>> |
getExceptionHandlerMap()
Returns the
Map which contains all messageType-MessageHandler
pairs registered to this handler. |
<E> MessageHandler<? super E> |
getMessageHandler(java.lang.Class<E> type)
Returns the
MessageHandler which is registered to process
the specified type . |
java.util.Map<java.lang.Class<?>,MessageHandler<?>> |
getReceivedMessageHandlerMap()
Returns the
Map which contains all messageType-MessageHandler
pairs registered to this handler for received messages. |
java.util.Map<java.lang.Class<?>,MessageHandler<?>> |
getSentMessageHandlerMap()
Returns the
Map which contains all messageType-MessageHandler
pairs registered to this handler for sent messages. |
void |
messageReceived(IoSession session,
java.lang.Object message)
Forwards the received events into the appropriate
MessageHandler
which is registered by addReceivedMessageHandler(Class, MessageHandler) . |
void |
messageSent(IoSession session,
java.lang.Object message)
Invoked when a message written by
IoSession.write(Object) is
sent out. |
<E extends java.lang.Throwable> |
removeExceptionHandler(java.lang.Class<E> type)
Deregisters a
MessageHandler that receives the messages of
the specified type . |
<E> MessageHandler<? super E> |
removeReceivedMessageHandler(java.lang.Class<E> type)
Deregisters a
MessageHandler that handles the received messages
of the specified type . |
<E> MessageHandler<? super E> |
removeSentMessageHandler(java.lang.Class<E> type)
Deregisters a
MessageHandler that handles the sent messages of
the specified type . |
sessionClosed, sessionCreated, sessionIdle, sessionOpened
public DemuxingIoHandler()
MessageHandler
s.public <E> MessageHandler<? super E> addReceivedMessageHandler(java.lang.Class<E> type, MessageHandler<? super E> handler)
MessageHandler
that handles the received messages of
the specified type
.public <E> MessageHandler<? super E> removeReceivedMessageHandler(java.lang.Class<E> type)
MessageHandler
that handles the received messages
of the specified type
.public <E> MessageHandler<? super E> addSentMessageHandler(java.lang.Class<E> type, MessageHandler<? super E> handler)
MessageHandler
that handles the sent messages of the
specified type
.public <E> MessageHandler<? super E> removeSentMessageHandler(java.lang.Class<E> type)
MessageHandler
that handles the sent messages of
the specified type
.public <E extends java.lang.Throwable> ExceptionHandler<? super E> addExceptionHandler(java.lang.Class<E> type, ExceptionHandler<? super E> handler)
MessageHandler
that receives the messages of
the specified type
.public <E extends java.lang.Throwable> ExceptionHandler<? super E> removeExceptionHandler(java.lang.Class<E> type)
MessageHandler
that receives the messages of
the specified type
.public <E> MessageHandler<? super E> getMessageHandler(java.lang.Class<E> type)
MessageHandler
which is registered to process
the specified type
.public java.util.Map<java.lang.Class<?>,MessageHandler<?>> getReceivedMessageHandlerMap()
Map
which contains all messageType-MessageHandler
pairs registered to this handler for received messages.public java.util.Map<java.lang.Class<?>,MessageHandler<?>> getSentMessageHandlerMap()
Map
which contains all messageType-MessageHandler
pairs registered to this handler for sent messages.public java.util.Map<java.lang.Class<?>,ExceptionHandler<?>> getExceptionHandlerMap()
Map
which contains all messageType-MessageHandler
pairs registered to this handler.public final void messageReceived(IoSession session, java.lang.Object message) throws java.lang.Exception
MessageHandler
which is registered by addReceivedMessageHandler(Class, MessageHandler)
.messageReceived
in interface IoHandler
messageReceived
in class IoHandlerAdapter
java.lang.Exception
public final void messageSent(IoSession session, java.lang.Object message) throws java.lang.Exception
IoHandler
IoSession.write(Object)
is
sent out.messageSent
in interface IoHandler
messageSent
in class IoHandlerAdapter
java.lang.Exception
public final void exceptionCaught(IoSession session, java.lang.Throwable cause) throws java.lang.Exception
IoHandler
IoHandler
implementation or by MINA. If cause
is an instance of
IOException
, MINA will close the connection automatically.exceptionCaught
in interface IoHandler
exceptionCaught
in class IoHandlerAdapter
java.lang.Exception
protected MessageHandler<java.lang.Object> findReceivedMessageHandler(java.lang.Class<?> type)
protected MessageHandler<java.lang.Object> findSentMessageHandler(java.lang.Class<?> type)
protected ExceptionHandler<java.lang.Throwable> findExceptionHandler(java.lang.Class<? extends java.lang.Throwable> type)
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