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