1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
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.core.session;
21
22 import java.net.SocketAddress;
23
24 import org.apache.mina.core.service.IoService;
25
26 /**
27 * A connectionless transport can recycle existing sessions by assigning an
28 * {@link IoSessionRecycler} to an {@link IoService}.
29 *
30 * @author The Apache MINA Project (dev@mina.apache.org)
31 * TODO More documentation
32 */
33 public interface IoSessionRecycler {
34 /**
35 * A dummy recycler that doesn't recycle any sessions. Using this recycler will
36 * make all session lifecycle events to be fired for every I/O for all connectionless
37 * sessions.
38 */
39 static IoSessionRecycler NOOP = new IoSessionRecycler() {
40 public void put(IoSession session) {
41 // Do nothing
42 }
43
44 public IoSession recycle(SocketAddress localAddress,
45 SocketAddress remoteAddress) {
46 return null;
47 }
48
49 public void remove(IoSession session) {
50 // Do nothing
51 }
52 };
53
54 /**
55 * Called when the underlying transport creates or writes a new {@link IoSession}.
56 *
57 * @param session
58 * the new {@link IoSession}.
59 */
60 void put(IoSession session);
61
62 /**
63 * Attempts to retrieve a recycled {@link IoSession}.
64 *
65 * @param localAddress
66 * the local socket address of the {@link IoSession} the
67 * transport wants to recycle.
68 * @param remoteAddress
69 * the remote socket address of the {@link IoSession} the
70 * transport wants to recycle.
71 * @return a recycled {@link IoSession}, or null if one cannot be found.
72 */
73 IoSession recycle(SocketAddress localAddress, SocketAddress remoteAddress);
74
75 /**
76 * Called when an {@link IoSession} is explicitly closed.
77 *
78 * @param session
79 * the new {@link IoSession}.
80 */
81 void remove(IoSession session);
82 }