@Override
public void sessionClosed(NextFilter nextFilter, IoSession session) throws Exception {
// Call finishDecode() first when a connection is closed.
ProtocolDecoder decoder = getDecoder(session);
ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);
try {
decoder.finishDecode(session, decoderOut);
} catch (Throwable t) {
ProtocolDecoderException pde;
if (t instanceof ProtocolDecoderException) {
pde = (ProtocolDecoderException) t;
} else {
pde = new ProtocolDecoderException(t);
}
throw pde;
} finally {
// Dispose everything
disposeCodec(session);
decoderOut.flush(nextFilter, session);
}
// Call the next filter
nextFilter.sessionClosed(session);
}
/**
* 着信したメッセージを処理し、セッションのデコーダを呼び出します。 着信バッファには複数のメッセージが含まれている可能性があるため、 デコーダが例外を投げるまでループする必要あり。
*
* <p>while ( buffer not empty ) try decode ( buffer ) catch break;
*/
@Override
public void messageReceived(NextFilter nextFilter, IoSession session, Object message)
throws Exception {
LOGGER.debug("Processing a MESSAGE_RECEIVED for session {}", session.getId());
if (!(message instanceof IoBuffer)) {
nextFilter.messageReceived(session, message);
return;
}
IoBuffer in = (IoBuffer) message;
ProtocolDecoder decoder = getDecoder(session);
ProtocolDecoderOutput decoderOut = getDecoderOut(session, nextFilter);
// Loop until we don't have anymore byte in the buffer,
// or until the decoder throws an unrecoverable exception or
// can't decoder a message, because there are not enough
// data in the buffer
while (in.hasRemaining()) {
int oldPos = in.position();
try {
synchronized (decoderOut) {
// Call the decoder with the read bytes
decoder.decode(session, in, decoderOut);
}
// Finish decoding if no exception was thrown.
decoderOut.flush(nextFilter, session);
} catch (Throwable t) {
ProtocolDecoderException pde;
if (t instanceof ProtocolDecoderException) {
pde = (ProtocolDecoderException) t;
} else {
pde = new ProtocolDecoderException(t);
}
if (pde.getHexdump() == null) {
// Generate a message hex dump
int curPos = in.position();
in.position(oldPos);
pde.setHexdump(in.getHexDump());
in.position(curPos);
}
// Fire the exceptionCaught event.
decoderOut.flush(nextFilter, session);
nextFilter.exceptionCaught(session, pde);
// Retry only if the type of the caught exception is
// recoverable and the buffer position has changed.
// We check buffer position additionally to prevent an
// infinite loop.
if (!(t instanceof RecoverableProtocolDecoderException) || (in.position() == oldPos)) {
break;
}
}
}
}
/**
* Dispose the decoder, removing its instance from the session's attributes, and calling the
* associated dispose method.
*/
private void disposeDecoder(IoSession session) {
ProtocolDecoder decoder = (ProtocolDecoder) session.removeAttribute(DECODER);
if (decoder == null) {
return;
}
try {
decoder.dispose(session);
} catch (Throwable t) {
LOGGER.warn("Failed to dispose: " + decoder.getClass().getName() + " (" + decoder + ')');
}
}
public void dispose(IoSession session) throws Exception {
synchronized (decoder) {
decoder.dispose(session);
}
}
public void finishDecode(IoSession session, ProtocolDecoderOutput out) throws Exception {
synchronized (decoder) {
decoder.finishDecode(session, out);
}
}
public void decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception {
synchronized (decoder) {
decoder.decode(session, in, out);
}
}
