author | weijun |
Wed, 01 Aug 2018 13:35:08 +0800 | |
changeset 51272 | 9d92ff04a29c |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.security.provider; |
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|
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import java.io.*; |
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import java.lang.ref.ReferenceQueue; |
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import java.lang.ref.WeakReference; |
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import java.util.concurrent.ConcurrentHashMap; |
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import java.util.concurrent.ConcurrentMap; |
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|
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/** |
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* A pool of {@code InputStream}s opened from distinct files. Only a single |
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* instance is ever opened from the same file. This is used to read special |
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* infinite files like {@code /dev/random} where the current file pointer is not |
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* relevant, so multiple readers can share the same file descriptor and |
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* consequently the same {@code InputStream}. |
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*/ |
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class FileInputStreamPool { |
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/** |
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* a pool of: StreamRef -> UnclosableInputStream -> FileInputStream(s) |
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*/ |
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private static final ConcurrentMap<File, StreamRef> pool = |
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new ConcurrentHashMap<>(); |
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|
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/** |
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* a reference queue of cleared StreamRef(s) |
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*/ |
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private static final ReferenceQueue<UnclosableInputStream> refQueue = |
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new ReferenceQueue<>(); |
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/** |
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* This method opens an underlying {@link java.io.FileInputStream} for a |
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* given {@code file} and returns a wrapper over it. The wrapper is shared |
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* among multiple readers of the same {@code file} and ignores |
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* {@link java.io.InputStream#close()} requests. The underlying stream is |
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* closed when all references to the wrapper are relinquished. |
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* |
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* @param file the file to be opened for reading. |
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* @return a shared {@link java.io.InputStream} instance opened from given |
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* file. |
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* @throws FileNotFoundException if the file does not exist, is a directory |
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* rather than a regular file, or for some |
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* other reason cannot be opened for reading. |
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* @throws SecurityException if a security manager exists and its |
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* <code>checkRead</code> method denies read |
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* access to the file. |
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*/ |
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static InputStream getInputStream(File file) throws IOException { |
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|
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// expunge any cleared references |
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StreamRef oldRref; |
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while ((oldRref = (StreamRef) refQueue.poll()) != null) { |
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pool.remove(oldRref.file, oldRref); |
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} |
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|
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// canonicalize the path |
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// (this also checks the read permission on the file if SecurityManager |
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// is present, so no checking is needed later when we just return the |
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// already opened stream) |
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File cfile = file.getCanonicalFile(); |
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|
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// check if it exists in pool |
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oldRref = pool.get(cfile); |
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UnclosableInputStream oldStream = (oldRref == null) |
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? null |
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: oldRref.get(); |
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StreamRef newRef = null; |
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UnclosableInputStream newStream = null; |
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// retry loop |
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while (true) { |
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if (oldStream != null) { |
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// close our optimistically opened stream 1st (if we opened it) |
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if (newStream != null) { |
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try { |
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newStream.getWrappedStream().close(); |
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} catch (IOException ignore) { |
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// can't do anything here |
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} |
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} |
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// return it |
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return oldStream; |
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} else { |
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// we need to open new stream optimistically (if not already) |
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if (newStream == null) { |
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newStream = new UnclosableInputStream( |
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new FileInputStream(cfile)); |
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newRef = new StreamRef(cfile, newStream, refQueue); |
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} |
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// either try to install newRef or replace oldRef with newRef |
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if (oldRref == null) { |
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oldRref = pool.putIfAbsent(cfile, newRef); |
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} else { |
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oldRref = pool.replace(cfile, oldRref, newRef) |
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? null |
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: pool.get(cfile); |
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} |
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if (oldRref == null) { |
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// success |
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return newStream; |
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} else { |
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// lost race |
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oldStream = oldRref.get(); |
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// another loop |
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} |
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} |
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} |
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} |
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|
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private static class StreamRef extends WeakReference<UnclosableInputStream> { |
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final File file; |
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StreamRef(File file, |
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UnclosableInputStream stream, |
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ReferenceQueue<UnclosableInputStream> refQueue) { |
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super(stream, refQueue); |
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this.file = file; |
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} |
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} |
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144 |
|
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private static final class UnclosableInputStream extends FilterInputStream { |
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UnclosableInputStream(InputStream in) { |
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super(in); |
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} |
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149 |
|
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@Override |
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public void close() throws IOException { |
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// Ignore close attempts since underlying InputStream is shared. |
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} |
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|
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InputStream getWrappedStream() { |
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return in; |
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} |
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} |
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} |