Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
ByteBufferFactory |
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ByteBufferFactory$ByteBufferType |
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| 0.0;0 |
1 | /* | |
2 | * | |
3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
4 | * | |
5 | * Copyright 2007-2008 Sun Microsystems, Inc. All rights reserved. | |
6 | * | |
7 | * The contents of this file are subject to the terms of either the GNU | |
8 | * General Public License Version 2 only ("GPL") or the Common Development | |
9 | * and Distribution License("CDDL") (collectively, the "License"). You | |
10 | * may not use this file except in compliance with the License. You can obtain | |
11 | * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html | |
12 | * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific | |
13 | * language governing permissions and limitations under the License. | |
14 | * | |
15 | * When distributing the software, include this License Header Notice in each | |
16 | * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt. | |
17 | * Sun designates this particular file as subject to the "Classpath" exception | |
18 | * as provided by Sun in the GPL Version 2 section of the License file that | |
19 | * accompanied this code. If applicable, add the following below the License | |
20 | * Header, with the fields enclosed by brackets [] replaced by your own | |
21 | * identifying information: "Portions Copyrighted [year] | |
22 | * [name of copyright owner]" | |
23 | * | |
24 | * Contributor(s): | |
25 | * | |
26 | * If you wish your version of this file to be governed by only the CDDL or | |
27 | * only the GPL Version 2, indicate your decision by adding "[Contributor] | |
28 | * elects to include this software in this distribution under the [CDDL or GPL | |
29 | * Version 2] license." If you don't indicate a single choice of license, a | |
30 | * recipient has the option to distribute your version of this file under | |
31 | * either the CDDL, the GPL Version 2 or to extend the choice of license to | |
32 | * its licensees as provided above. However, if you add GPL Version 2 code | |
33 | * and therefore, elected the GPL Version 2 license, then the option applies | |
34 | * only if the new code is made subject to such option by the copyright | |
35 | * holder. | |
36 | * | |
37 | */ | |
38 | ||
39 | package com.sun.grizzly.util; | |
40 | ||
41 | import java.nio.ByteBuffer; | |
42 | ||
43 | ||
44 | /** | |
45 | * Factory class used to create {@link ByteBuffer}. | |
46 | * | |
47 | * The ByteBuffer can by direct (ByteBufferType.DIRECT) or heap (ByteBufferType.HEAP) | |
48 | * a view (ByteBufferType.DIRECT_VIEW) or ByteBufferType.HEAP_VIEW) | |
49 | * or backed by an array (ByteBufferType.HEAP_ARRAY). | |
50 | * | |
51 | * @author Jean-Francois Arcand | |
52 | */ | |
53 | public class ByteBufferFactory{ | |
54 | ||
55 | /** | |
56 | * An enumeration of all type of ByteBuffer this object can create. | |
57 | */ | |
58 | 6 | public enum ByteBufferType { DIRECT, HEAP, DIRECT_VIEW, HEAP_VIEW, HEAP_ARRAY } |
59 | ||
60 | ||
61 | /** | |
62 | * The default capacity of the default view of a {@link ByteBuffer} | |
63 | */ | |
64 | 1 | public static int defaultCapacity = 8192; |
65 | ||
66 | ||
67 | /** | |
68 | * The default capacity of the {@link ByteBuffer} from which views | |
69 | * will be created. | |
70 | */ | |
71 | 1 | public static int capacity = 4000000; |
72 | ||
73 | ||
74 | /** | |
75 | * The {@link ByteBuffer} used to create direct byteBuffer view. | |
76 | */ | |
77 | private static ByteBuffer directByteBuffer; | |
78 | ||
79 | ||
80 | /** | |
81 | * The {@link ByteBuffer} used to create direct byteBuffer view. | |
82 | */ | |
83 | private static ByteBuffer heapByteBuffer; | |
84 | ||
85 | ||
86 | /** | |
87 | * Private constructor. | |
88 | */ | |
89 | 0 | private ByteBufferFactory(){ |
90 | 0 | } |
91 | ||
92 | ||
93 | /** | |
94 | * Return a direct {@link ByteBuffer} view | |
95 | * @param size the Size of the {@link ByteBuffer} | |
96 | * @param direct - direct or non-direct buffer? | |
97 | * @return {@link ByteBuffer} | |
98 | */ | |
99 | public synchronized static ByteBuffer allocateView(int size, boolean direct){ | |
100 | 729 | if (direct && (directByteBuffer == null || |
101 | (directByteBuffer.capacity() - directByteBuffer.limit() < size))){ | |
102 | 0 | directByteBuffer = ByteBuffer.allocateDirect(capacity); |
103 | 729 | } else if (heapByteBuffer == null || |
104 | (heapByteBuffer.capacity() - heapByteBuffer.limit() < size)){ | |
105 | 1 | heapByteBuffer = ByteBuffer.allocate(capacity); |
106 | } | |
107 | 729 | ByteBuffer byteBuffer = (direct ? directByteBuffer : heapByteBuffer); |
108 | ||
109 | 729 | byteBuffer.limit(byteBuffer.position() + size); |
110 | 729 | ByteBuffer view = byteBuffer.slice(); |
111 | 729 | byteBuffer.position(byteBuffer.limit()); |
112 | ||
113 | 729 | return view; |
114 | } | |
115 | ||
116 | ||
117 | /** | |
118 | * Return a direct {@link ByteBuffer} view using the default size. | |
119 | * @param direct - direct or non-direct buffer | |
120 | * @return {@link ByteBuffer} | |
121 | */ | |
122 | public synchronized static ByteBuffer allocateView(boolean direct){ | |
123 | 0 | return allocateView(defaultCapacity, direct); |
124 | } | |
125 | ||
126 | ||
127 | /** | |
128 | * Return a new ByteBuffer based on the requested <code>ByteBufferType</code> | |
129 | * @param type the requested <code>ByteBufferType</code> | |
130 | * @param size the {@link ByteBuffer} size. | |
131 | * @return a new ByteBuffer based on the requested <code>ByteBufferType</code> | |
132 | */ | |
133 | public static ByteBuffer allocate(ByteBufferType type,int size){ | |
134 | 364 | if (type == ByteBufferType.HEAP){ |
135 | 0 | return ByteBuffer.allocate(size); |
136 | 364 | } else if (type == ByteBufferType.HEAP_VIEW) { |
137 | 364 | return allocateView(size,false); |
138 | 0 | } else if (type == ByteBufferType.HEAP_ARRAY) { |
139 | 0 | return ByteBuffer.wrap(new byte[size]); |
140 | 0 | } else if (type == ByteBufferType.DIRECT){ |
141 | 0 | return ByteBuffer.allocateDirect(size); |
142 | 0 | } else if (type == ByteBufferType.DIRECT_VIEW){ |
143 | 0 | return allocateView(size,true); |
144 | } else { | |
145 | 0 | throw new IllegalStateException("Invalid ByteBuffer Type"); |
146 | } | |
147 | } | |
148 | } |