Browse Source
* stable-4.7: Run auto GC in the background Change-Id: I5e25765f65d833f13cbe99696ef33055d7f5c4cf Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>stable-4.8
Matthias Sohn
8 years ago
9 changed files with 328 additions and 2 deletions
@ -0,0 +1,191 @@
|
||||
/* |
||||
* Copyright (C) 2017 Two Sigma Open Source |
||||
* and other copyright owners as documented in the project's IP log. |
||||
* |
||||
* This program and the accompanying materials are made available |
||||
* under the terms of the Eclipse Distribution License v1.0 which |
||||
* accompanies this distribution, is reproduced below, and is |
||||
* available at http://www.eclipse.org/org/documents/edl-v10.php
|
||||
* |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or |
||||
* without modification, are permitted provided that the following |
||||
* conditions are met: |
||||
* |
||||
* - Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* |
||||
* - Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following |
||||
* disclaimer in the documentation and/or other materials provided |
||||
* with the distribution. |
||||
* |
||||
* - Neither the name of the Eclipse Foundation, Inc. nor the |
||||
* names of its contributors may be used to endorse or promote |
||||
* products derived from this software without specific prior |
||||
* written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
||||
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
||||
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||||
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
||||
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||||
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
||||
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
||||
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
||||
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||||
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
||||
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
*/ |
||||
|
||||
package org.eclipse.jgit.internal.storage.file; |
||||
|
||||
import org.eclipse.jgit.api.errors.JGitInternalException; |
||||
import org.eclipse.jgit.internal.JGitText; |
||||
import org.eclipse.jgit.lib.ConfigConstants; |
||||
import org.eclipse.jgit.util.GitDateParser; |
||||
import org.eclipse.jgit.util.SystemReader; |
||||
|
||||
import static java.nio.charset.StandardCharsets.UTF_8; |
||||
|
||||
import java.io.BufferedReader; |
||||
import java.io.File; |
||||
import java.io.IOException; |
||||
import java.nio.file.Files; |
||||
import java.nio.file.NoSuchFileException; |
||||
import java.nio.file.attribute.FileTime; |
||||
import java.text.MessageFormat; |
||||
import java.text.ParseException; |
||||
import java.time.Instant; |
||||
|
||||
/** |
||||
* This class manages the gc.log file for a {@link FileRepository}. |
||||
*/ |
||||
class GcLog { |
||||
private final FileRepository repo; |
||||
|
||||
private final File logFile; |
||||
|
||||
private final LockFile lock; |
||||
|
||||
private Instant gcLogExpire; |
||||
|
||||
private static final String LOG_EXPIRY_DEFAULT = "1.day.ago"; //$NON-NLS-1$
|
||||
|
||||
private boolean nonEmpty = false; |
||||
|
||||
/** |
||||
* Construct a GcLog object for a {@link FileRepository} |
||||
* |
||||
* @param repo |
||||
* the repository |
||||
*/ |
||||
GcLog(FileRepository repo) { |
||||
this.repo = repo; |
||||
logFile = new File(repo.getDirectory(), "gc.log"); //$NON-NLS-1$
|
||||
lock = new LockFile(logFile); |
||||
} |
||||
|
||||
private Instant getLogExpiry() throws ParseException { |
||||
if (gcLogExpire == null) { |
||||
String logExpiryStr = repo.getConfig().getString( |
||||
ConfigConstants.CONFIG_GC_SECTION, null, |
||||
ConfigConstants.CONFIG_KEY_LOGEXPIRY); |
||||
if (logExpiryStr == null) { |
||||
logExpiryStr = LOG_EXPIRY_DEFAULT; |
||||
} |
||||
gcLogExpire = GitDateParser.parse(logExpiryStr, null, |
||||
SystemReader.getInstance().getLocale()).toInstant(); |
||||
} |
||||
return gcLogExpire; |
||||
} |
||||
|
||||
private boolean autoGcBlockedByOldLockFile(boolean background) { |
||||
try { |
||||
FileTime lastModified = Files.getLastModifiedTime(logFile.toPath()); |
||||
if (lastModified.toInstant().compareTo(getLogExpiry()) > 0) { |
||||
// There is an existing log file, which is too recent to ignore
|
||||
if (!background) { |
||||
try (BufferedReader reader = Files |
||||
.newBufferedReader(logFile.toPath())) { |
||||
char[] buf = new char[1000]; |
||||
int len = reader.read(buf, 0, 1000); |
||||
String oldError = new String(buf, 0, len); |
||||
|
||||
throw new JGitInternalException(MessageFormat.format( |
||||
JGitText.get().gcLogExists, oldError, logFile)); |
||||
} |
||||
} |
||||
return true; |
||||
} |
||||
} catch (NoSuchFileException e) { |
||||
// No existing log file, OK.
|
||||
} catch (IOException | ParseException e) { |
||||
throw new JGitInternalException(e.getMessage(), e); |
||||
} |
||||
return false; |
||||
} |
||||
|
||||
/** |
||||
* Lock the GC log file for updates |
||||
* |
||||
* @param background |
||||
* If true, and if gc.log already exists, unlock and return false |
||||
* @return {@code true} if we hold the lock |
||||
*/ |
||||
boolean lock(boolean background) { |
||||
try { |
||||
if (!lock.lock()) { |
||||
return false; |
||||
} |
||||
} catch (IOException e) { |
||||
throw new JGitInternalException(e.getMessage(), e); |
||||
} |
||||
if (autoGcBlockedByOldLockFile(background)) { |
||||
lock.unlock(); |
||||
return false; |
||||
} |
||||
return true; |
||||
} |
||||
|
||||
/** |
||||
* Unlock (roll back) the GC log lock |
||||
*/ |
||||
void unlock() { |
||||
lock.unlock(); |
||||
} |
||||
|
||||
/** |
||||
* Commit changes to the gc log, if there have been any writes. Otherwise, |
||||
* just unlock and delete the existing file (if any) |
||||
* |
||||
* @return true if committing (or unlocking/deleting) succeeds. |
||||
*/ |
||||
boolean commit() { |
||||
if (nonEmpty) { |
||||
return lock.commit(); |
||||
} else { |
||||
logFile.delete(); |
||||
lock.unlock(); |
||||
return true; |
||||
} |
||||
} |
||||
|
||||
/** |
||||
* Write to the pending gc log. Content will be committed upon a call to |
||||
* commit() |
||||
* |
||||
* @param content |
||||
* The content to write |
||||
* @throws IOException |
||||
*/ |
||||
void write(String content) throws IOException { |
||||
if (content.length() > 0) { |
||||
nonEmpty = true; |
||||
} |
||||
lock.write(content.getBytes(UTF_8)); |
||||
} |
||||
} |
||||
Loading…
Reference in new issue