1 /*
2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.xml.internal.stream.util;
27
28 import java.lang.ref.*;
29
30 /**
31 * This is a Singleton class that allows you to allocate buffer that
32 * are stored in ThreadLocal. This class stores 3 types of char
33 * buffers - small (< 128 bytes), medium (<2K) and large (> 2K) as
34 * well as three byte buffers - small, medium and large.
35 * The local storage is activated on the return of the buffer.
36 * The buffer returns null if it is already allocated.
37 *
38 * @author Binu.John@sun.com
39 * @author Santiago.PericasGeertsen@sun.com
40 */
41 public class ThreadLocalBufferAllocator {
42 private static ThreadLocal tlba = new ThreadLocal();
43
44 public static BufferAllocator getBufferAllocator() {
45 SoftReference bAllocatorRef = (SoftReference) tlba.get();
46 if (bAllocatorRef == null || bAllocatorRef.get() == null) {
47 bAllocatorRef = new SoftReference(new BufferAllocator());
48 tlba.set(bAllocatorRef);
49 }
50
51 return (BufferAllocator) bAllocatorRef.get();
52 }
53 }
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1 /*
2 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.xml.internal.stream.util;
27
28 import java.lang.ref.*;
29
30 /**
31 * This is a Singleton class that allows you to allocate buffer that
32 * are stored in ThreadLocal. This class stores 3 types of char
33 * buffers - small (< 128 bytes), medium (<2K) and large (> 2K) as
34 * well as three byte buffers - small, medium and large.
35 * The local storage is activated on the return of the buffer.
36 * The buffer returns null if it is already allocated.
37 *
38 * @author Binu.John@sun.com
39 * @author Santiago.PericasGeertsen@sun.com
40 */
41 public class ThreadLocalBufferAllocator {
42 private static final ThreadLocal<SoftReference<BufferAllocator>> TL = new ThreadLocal<>();
43
44 public static BufferAllocator getBufferAllocator() {
45 BufferAllocator ba = null;
46 SoftReference<BufferAllocator> sr = TL.get();
47 if (sr != null) {
48 ba = sr.get();
49 }
50 if (ba == null) {
51 ba = new BufferAllocator();
52 sr = new SoftReference<>(ba);
53 TL.set(sr);
54 }
55 return ba;
56 }
57 }
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