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.filter.codec;
21
22 import java.util.Queue;
23 import java.util.concurrent.ConcurrentLinkedQueue;
24
25 import org.apache.mina.core.buffer.IoBuffer;
26
27 /**
28 * A {@link ProtocolEncoderOutput} based on queue.
29 *
30 * @author The Apache MINA Project (dev@mina.apache.org)
31 */
32 public abstract class AbstractProtocolEncoderOutput implements
33 ProtocolEncoderOutput {
34 private final Queue<Object> messageQueue = new ConcurrentLinkedQueue<Object>();
35
36 private boolean buffersOnly = true;
37
38 public AbstractProtocolEncoderOutput() {
39 // Do nothing
40 }
41
42 public Queue<Object> getMessageQueue() {
43 return messageQueue;
44 }
45
46 public void write(Object encodedMessage) {
47 if (encodedMessage instanceof IoBuffer) {
48 IoBuffer buf = (IoBuffer) encodedMessage;
49 if (buf.hasRemaining()) {
50 messageQueue.offer(buf);
51 } else {
52 throw new IllegalArgumentException(
53 "buf is empty. Forgot to call flip()?");
54 }
55 } else {
56 messageQueue.offer(encodedMessage);
57 buffersOnly = false;
58 }
59 }
60
61 public void mergeAll() {
62 if (!buffersOnly) {
63 throw new IllegalStateException(
64 "the encoded message list contains a non-buffer.");
65 }
66
67 final int size = messageQueue.size();
68
69 if (size < 2) {
70 // no need to merge!
71 return;
72 }
73
74 // Get the size of merged BB
75 int sum = 0;
76 for (Object b : messageQueue) {
77 sum += ((IoBuffer) b).remaining();
78 }
79
80 // Allocate a new BB that will contain all fragments
81 IoBuffer newBuf = IoBuffer.allocate(sum);
82
83 // and merge all.
84 for (; ;) {
85 IoBuffer buf = (IoBuffer) messageQueue.poll();
86 if (buf == null) {
87 break;
88 }
89
90 newBuf.put(buf);
91 }
92
93 // Push the new buffer finally.
94 newBuf.flip();
95 messageQueue.add(newBuf);
96 }
97 }