Merge "Fix FileSnapShot"
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7a1bd7adb1
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/*
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* Copyright (C) 2010, Robin Rosenberg
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.storage.file;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import org.eclipse.jgit.util.FileUtils;
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import org.junit.Before;
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import org.junit.Test;
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import static org.junit.Assert.*;
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public class FileSnapshotTest {
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private List<File> files = new ArrayList<File>();
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private final File trash = new File(new File("target"), "trash");
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@Before
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public void tearDown() throws Exception {
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FileUtils.delete(trash, FileUtils.RECURSIVE | FileUtils.SKIP_MISSING);
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}
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private void waitNextSec(File f) {
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long initialLastModified = f.lastModified();
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do {
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f.setLastModified(System.currentTimeMillis());
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} while (f.lastModified() == initialLastModified);
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}
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/**
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* Change data and time stamp.
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*
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* @throws Exception
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*/
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@Test
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public void testActuallyIsModifiedTrivial() throws Exception {
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File f1 = createFile("simple");
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waitNextSec(f1);
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FileSnapshot save = FileSnapshot.save(f1);
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append(f1, (byte) 'x');
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waitNextSec(f1);
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assertTrue(save.isModified(f1));
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}
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/**
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* Create a file, wait long enough and verify that it has not been modified.
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* 3.5 seconds mean any difference between file system timestamp and system
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* clock should be significant.
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*
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* @throws Exception
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*/
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@Test
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public void testOldFile() throws Exception {
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File f1 = createFile("oldfile");
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waitNextSec(f1);
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FileSnapshot save = FileSnapshot.save(f1);
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Thread.sleep(3500);
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assertFalse(save.isModified(f1));
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}
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/**
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* Create a file, but don't wait long enough for the difference between file
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* system clock and system clock to be significant. Assume the file may have
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* been modified. It may have been, but the clock alone cannot determine
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* this
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*
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* @throws Exception
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*/
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@Test
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public void testNewFileWithWait() throws Exception {
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File f1 = createFile("newfile");
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waitNextSec(f1);
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FileSnapshot save = FileSnapshot.save(f1);
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Thread.sleep(1500);
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assertTrue(save.isModified(f1));
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}
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/**
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* Same as {@link #testNewFileWithWait()} but do not wait at all
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*
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* @throws Exception
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*/
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@Test
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public void testNewFileNoWait() throws Exception {
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File f1 = createFile("newfile");
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waitNextSec(f1);
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FileSnapshot save = FileSnapshot.save(f1);
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Thread.sleep(1500);
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assertTrue(save.isModified(f1));
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}
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private File createFile(String string) throws IOException {
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trash.mkdirs();
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File f = File.createTempFile(string, "tdat", trash);
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files.add(f);
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return f;
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}
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private void append(File f, byte b) throws IOException {
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FileOutputStream os = new FileOutputStream(f, true);
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try {
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os.write(b);
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} finally {
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os.close();
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}
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}
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}
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@ -45,8 +45,6 @@
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import java.io.File;
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import org.eclipse.jgit.util.SystemReader;
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/**
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* Caches when a file was last read, making it possible to detect future edits.
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* <p>
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@ -84,7 +82,7 @@ public class FileSnapshot {
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* @return the snapshot.
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*/
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public static FileSnapshot save(File path) {
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final long read = SystemReader.getInstance().getCurrentTime();
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final long read = System.currentTimeMillis();
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final long modified = path.lastModified();
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return new FileSnapshot(read, modified);
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}
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@ -109,7 +107,7 @@ long lastModified() {
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}
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/**
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* Check if the path has been modified since the snapshot was saved.
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* Check if the path may have been modified since the snapshot was saved.
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*
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* @param path
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* the path the snapshot describes.
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@ -203,6 +201,12 @@ private boolean isModified(final long currLastModified) {
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return false;
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}
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// Our lastRead flag may be old, refresh and retry
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lastRead = System.currentTimeMillis();
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if (notRacyClean(lastRead)) {
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return false;
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}
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// We last read this path too close to its last observed
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// modification time. We may have missed a modification.
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// Scan again, to ensure we still see the same state.
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