01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one
03: * or more contributor license agreements. See the NOTICE file
04: * distributed with this work for additional information
05: * regarding copyright ownership. The ASF licenses this file
06: * to you under the Apache License, Version 2.0 (the
07: * "License"); you may not use this file except in compliance
08: * with the License. You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing,
13: * software distributed under the License is distributed on an
14: * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15: * KIND, either express or implied. See the License for the
16: * specific language governing permissions and limitations
17: * under the License.
18: *
19: */
20: package org.apache.mina.handler.demux;
21:
22: import org.apache.mina.common.IoSession;
23:
24: /**
25: * A handler interface that {@link DemuxingIoHandler} forwards
26: * <code>exceptionCaught</code> events to. You have to register your
27: * handler with the type of exception you want to get notified using
28: * {@link DemuxingIoHandler#addExceptionHandler(Class, ExceptionHandler)}.
29: *
30: * @author The Apache MINA Project (dev@mina.apache.org)
31: * @version $Rev: 603158 $, $Date: 2007-12-11 00:06:13 -0700 (Tue, 11 Dec 2007) $
32: */
33: public interface ExceptionHandler<E extends Throwable> {
34: /**
35: * A {@link ExceptionHandler} that does nothing. This is useful when
36: * you want to ignore an exception of a specific type silently.
37: */
38: static ExceptionHandler<Throwable> NOOP = new ExceptionHandler<Throwable>() {
39: public void exceptionCaught(IoSession session, Throwable cause) {
40: }
41: };
42:
43: /**
44: * A {@link ExceptionHandler} that closes the session immediately.
45: * This is useful when you want to close the session when an exception of
46: * a specific type is raised.
47: */
48: static ExceptionHandler<Throwable> CLOSE = new ExceptionHandler<Throwable>() {
49: public void exceptionCaught(IoSession session, Throwable cause) {
50: session.close();
51: }
52: };
53:
54: /**
55: * Invoked when the specific type of exception is caught from the
56: * specified <code>session</code>.
57: */
58: void exceptionCaught(IoSession session, E cause) throws Exception;
59: }
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