151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/* 2dd2c67a47dc742e19c6710ddd6e1b85f95dd1d1fNeil Fuller * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. 351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is free software; you can redistribute it and/or modify it 651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * under the terms of the GNU General Public License version 2 only, as 751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * published by the Free Software Foundation. Oracle designates this 851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * particular file as subject to the "Classpath" exception as provided 951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * by Oracle in the LICENSE file that accompanied this code. 1051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * This code is distributed in the hope that it will be useful, but WITHOUT 1251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * version 2 for more details (a copy is included in the LICENSE file that 1551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * accompanied this code). 1651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 1751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * You should have received a copy of the GNU General Public License version 1851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2 along with this work; if not, write to the Free Software Foundation, 1951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * 2151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * or visit www.oracle.com if you need additional information or have any 2351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * questions. 2451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 2551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipackage sun.nio.cs; 2851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 2951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskiimport java.nio.charset.*; 3051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski/** 3351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski * Utility class for caching per-thread decoders and encoders. 3451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski */ 3551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebskipublic class ThreadLocalCoders { 3751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 3851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static final int CACHE_SIZE = 3; 3951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static abstract class Cache { 4151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Thread-local reference to array of cached objects, in LRU order 431a91deb15b7cc44851ebe9efbd935fc92b65a8dbShubham Ajmera private ThreadLocal<Object[]> cache = new ThreadLocal<>(); 4451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private final int size; 4551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 4651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Cache(int size) { 4751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski this.size = size; 4851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 4951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski abstract Object create(Object name); 5151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private void moveToFront(Object[] oa, int i) { 5351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object ob = oa[i]; 5451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int j = i; j > 0; j--) 5551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski oa[j] = oa[j - 1]; 5651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski oa[0] = ob; 5751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 5851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 5951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski abstract boolean hasName(Object ob, Object name); 6051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 6151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object forName(Object name) { 621a91deb15b7cc44851ebe9efbd935fc92b65a8dbShubham Ajmera Object[] oa = cache.get(); 6351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (oa == null) { 6451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski oa = new Object[size]; 6551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski cache.set(oa); 6651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } else { 6751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski for (int i = 0; i < oa.length; i++) { 6851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object ob = oa[i]; 6951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (ob == null) 7051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski continue; 7151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (hasName(ob, name)) { 7251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (i > 0) 7351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski moveToFront(oa, i); 7451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ob; 7551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 7851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 7951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski // Create a new object 8051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object ob = create(name); 8151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski oa[oa.length - 1] = ob; 8251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski moveToFront(oa, oa.length - 1); 8351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ob; 8451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 8751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 8851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static Cache decoderCache = new Cache(CACHE_SIZE) { 8951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean hasName(Object ob, Object name) { 9051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof String) 9151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (((CharsetDecoder)ob).charset().name().equals(name)); 9251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof Charset) 9351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((CharsetDecoder)ob).charset().equals(name); 9451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 9551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 9651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object create(Object name) { 9751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof String) 9851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Charset.forName((String)name).newDecoder(); 9951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof Charset) 10051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((Charset)name).newDecoder(); 10151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski assert false; 10251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 10351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 10451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski }; 10551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 10651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public static CharsetDecoder decoderFor(Object name) { 10751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski CharsetDecoder cd = (CharsetDecoder)decoderCache.forName(name); 10851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski cd.reset(); 10951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return cd; 11051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 11151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 11251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski private static Cache encoderCache = new Cache(CACHE_SIZE) { 11351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski boolean hasName(Object ob, Object name) { 11451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof String) 11551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return (((CharsetEncoder)ob).charset().name().equals(name)); 11651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof Charset) 11751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((CharsetEncoder)ob).charset().equals(name); 11851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return false; 11951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 12051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski Object create(Object name) { 12151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof String) 12251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return Charset.forName((String)name).newEncoder(); 12351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski if (name instanceof Charset) 12451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ((Charset)name).newEncoder(); 12551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski assert false; 12651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return null; 12751b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 12851b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski }; 12951b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13051b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski public static CharsetEncoder encoderFor(Object name) { 13151b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski CharsetEncoder ce = (CharsetEncoder)encoderCache.forName(name); 13251b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski ce.reset(); 13351b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski return ce; 13451b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski } 13551b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski 13651b1b6997fd3f980076b8081f7f1165ccc2a4008Piotr Jastrzebski} 137