1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/file/ZipFileIndexCache.java Mon Jan 24 16:38:56 2011 -0800
1.3 @@ -0,0 +1,149 @@
1.4 +/*
1.5 + * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.file;
1.30 +
1.31 +import com.sun.tools.javac.file.RelativePath.RelativeDirectory;
1.32 +import com.sun.tools.javac.util.Context;
1.33 +import java.io.File;
1.34 +import java.io.IOException;
1.35 +import java.util.ArrayList;
1.36 +import java.util.HashMap;
1.37 +import java.util.Iterator;
1.38 +import java.util.List;
1.39 +import java.util.Map;
1.40 +
1.41 +
1.42 +/** A cache for ZipFileIndex objects. */
1.43 +public class ZipFileIndexCache {
1.44 +
1.45 + private final Map<File, ZipFileIndex> map =
1.46 + new HashMap<File, ZipFileIndex>();
1.47 +
1.48 + /** Get a shared instance of the cache. */
1.49 + private static ZipFileIndexCache sharedInstance;
1.50 + public synchronized static ZipFileIndexCache getSharedInstance() {
1.51 + if (sharedInstance == null)
1.52 + sharedInstance = new ZipFileIndexCache();
1.53 + return sharedInstance;
1.54 + }
1.55 +
1.56 + /** Get a context-specific instance of a cache. */
1.57 + public static ZipFileIndexCache instance(Context context) {
1.58 + ZipFileIndexCache instance = context.get(ZipFileIndexCache.class);
1.59 + if (instance == null)
1.60 + context.put(ZipFileIndexCache.class, instance = new ZipFileIndexCache());
1.61 + return instance;
1.62 + }
1.63 +
1.64 + /**
1.65 + * Returns a list of all ZipFileIndex entries
1.66 + *
1.67 + * @return A list of ZipFileIndex entries, or an empty list
1.68 + */
1.69 + public List<ZipFileIndex> getZipFileIndexes() {
1.70 + return getZipFileIndexes(false);
1.71 + }
1.72 +
1.73 + /**
1.74 + * Returns a list of all ZipFileIndex entries
1.75 + *
1.76 + * @param openedOnly If true it returns a list of only opened ZipFileIndex entries, otherwise
1.77 + * all ZipFileEntry(s) are included into the list.
1.78 + * @return A list of ZipFileIndex entries, or an empty list
1.79 + */
1.80 + public synchronized List<ZipFileIndex> getZipFileIndexes(boolean openedOnly) {
1.81 + List<ZipFileIndex> zipFileIndexes = new ArrayList<ZipFileIndex>();
1.82 +
1.83 + zipFileIndexes.addAll(map.values());
1.84 +
1.85 + if (openedOnly) {
1.86 + for(ZipFileIndex elem : zipFileIndexes) {
1.87 + if (!elem.isOpen()) {
1.88 + zipFileIndexes.remove(elem);
1.89 + }
1.90 + }
1.91 + }
1.92 +
1.93 + return zipFileIndexes;
1.94 + }
1.95 +
1.96 + public synchronized ZipFileIndex getZipFileIndex(File zipFile,
1.97 + RelativeDirectory symbolFilePrefix,
1.98 + boolean useCache, String cacheLocation,
1.99 + boolean writeIndex) throws IOException {
1.100 + ZipFileIndex zi = getExistingZipIndex(zipFile);
1.101 +
1.102 + if (zi == null || (zi != null && zipFile.lastModified() != zi.zipFileLastModified)) {
1.103 + zi = new ZipFileIndex(zipFile, symbolFilePrefix, writeIndex,
1.104 + useCache, cacheLocation);
1.105 + map.put(zipFile, zi);
1.106 + }
1.107 + return zi;
1.108 + }
1.109 +
1.110 + public synchronized ZipFileIndex getExistingZipIndex(File zipFile) {
1.111 + return map.get(zipFile);
1.112 + }
1.113 +
1.114 + public synchronized void clearCache() {
1.115 + map.clear();
1.116 + }
1.117 +
1.118 + public synchronized void clearCache(long timeNotUsed) {
1.119 + Iterator<File> cachedFileIterator = map.keySet().iterator();
1.120 + while (cachedFileIterator.hasNext()) {
1.121 + File cachedFile = cachedFileIterator.next();
1.122 + ZipFileIndex cachedZipIndex = map.get(cachedFile);
1.123 + if (cachedZipIndex != null) {
1.124 + long timeToTest = cachedZipIndex.lastReferenceTimeStamp + timeNotUsed;
1.125 + if (timeToTest < cachedZipIndex.lastReferenceTimeStamp || // Overflow...
1.126 + System.currentTimeMillis() > timeToTest) {
1.127 + map.remove(cachedFile);
1.128 + }
1.129 + }
1.130 + }
1.131 + }
1.132 +
1.133 + public synchronized void removeFromCache(File file) {
1.134 + map.remove(file);
1.135 + }
1.136 +
1.137 + /** Sets already opened list of ZipFileIndexes from an outside client
1.138 + * of the compiler. This functionality should be used in a non-batch clients of the compiler.
1.139 + */
1.140 + public synchronized void setOpenedIndexes(List<ZipFileIndex>indexes) throws IllegalStateException {
1.141 + if (map.isEmpty()) {
1.142 + String msg =
1.143 + "Setting opened indexes should be called only when the ZipFileCache is empty. "
1.144 + + "Call JavacFileManager.flush() before calling this method.";
1.145 + throw new IllegalStateException(msg);
1.146 + }
1.147 +
1.148 + for (ZipFileIndex zfi : indexes) {
1.149 + map.put(zfi.zipFile, zfi);
1.150 + }
1.151 + }
1.152 +}
