jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java@ceaa6549687a (annotated)

src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java@ceaa6549687a (annotated)

src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java

Wed, 03 Sep 2008 10:46:25 -0700

author: jjg
date: Wed, 03 Sep 2008 10:46:25 -0700
changeset 106: ceaa6549687a
child 333: 7c2d6da61646
permissions: -rw-r--r--

6743107: clean up use of static caches in file manager
Reviewed-by: mcimadamore

 /*
  * Copyright 2005-2008 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Sun designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Sun in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  */
 package com.sun.tools.javac.file;
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
 import com.sun.tools.javac.util.Context;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 /**
  * Caching implementation of FSInfo
  */
 public class CacheFSInfo extends FSInfo {
     /**
      * Register a Context.Factory to create a singleton CacheFSInfo.
      */
     public static void preRegister(final Context context) {
         context.put(FSInfo.class, new Context.Factory<FSInfo>() {
             public FSInfo make() {
                 if (singleton == null)
                     singleton = new CacheFSInfo();
                 context.put(FSInfo.class, singleton);
                 return singleton;
             }
         });
     }
     static CacheFSInfo singleton;
     public void clearCache() {
         cache.clear();
     }
     @Override
     public File getCanonicalFile(File file) {
         Entry e = getEntry(file);
         return e.canonicalFile;
     }
     @Override
     public boolean exists(File file) {
         Entry e = getEntry(file);
         return e.exists;
     }
     @Override
     public boolean isDirectory(File file) {
         Entry e = getEntry(file);
         return e.isDirectory;
     }
     @Override
     public boolean isFile(File file) {
         Entry e = getEntry(file);
         return e.isFile;
     }
     @Override
     public List<File> getJarClassPath(File file) throws IOException {
         // don't bother to lock the cache, because it is thread-safe, and
         // because the worst that can happen would be to create two identical
         // jar class paths together and have one overwrite the other.
         Entry e = getEntry(file);
         if (e.jarClassPath == null)
             e.jarClassPath = super.getJarClassPath(file);
         return e.jarClassPath;
     }
     private Entry getEntry(File file) {
         // don't bother to lock the cache, because it is thread-safe, and
         // because the worst that can happen would be to create two identical
         // entries together and have one overwrite the other.
         Entry e = cache.get(file);
         if (e == null) {
             e = new Entry();
             e.canonicalFile = super.getCanonicalFile(file);
             e.exists = super.exists(file);
             e.isDirectory = super.isDirectory(file);
             e.isFile = super.isFile(file);
             cache.put(file, e);
         }
         return e;
     }
     // could also be a Map<File,SoftReference<Entry>> ?
     private Map<File,Entry> cache = new ConcurrentHashMap<File,Entry>();
     private static class Entry {
         File canonicalFile;
         boolean exists;
         boolean isFile;
         boolean isDirectory;
         List<File> jarClassPath;
     }
 }

Mercurial > jdk8-mips64-public > langtools / annotate

src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java@ceaa6549687a (annotated)

src/share/classes/com/sun/tools/javac/file/CacheFSInfo.java