GarbageCollectCommand.java
/*
* Copyright (C) 2012, Matthias Sohn <matthias.sohn@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.api;
import java.io.IOException;
import java.text.MessageFormat;
import java.text.ParseException;
import java.util.Date;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.internal.storage.dfs.DfsGarbageCollector;
import org.eclipse.jgit.internal.storage.dfs.DfsRepository;
import org.eclipse.jgit.internal.storage.file.FileRepository;
import org.eclipse.jgit.internal.storage.file.GC;
import org.eclipse.jgit.internal.storage.file.GC.RepoStatistics;
import org.eclipse.jgit.lib.ConfigConstants;
import org.eclipse.jgit.lib.ProgressMonitor;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;
import org.eclipse.jgit.storage.pack.PackConfig;
/**
* A class used to execute a {@code gc} command. It has setters for all
* supported options and arguments of this command and a {@link #call()} method
* to finally execute the command. Each instance of this class should only be
* used for one invocation of the command (means: one call to {@link #call()})
*
* @since 2.2
* @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-gc.html"
* >Git documentation about gc</a>
*/
public class GarbageCollectCommand extends GitCommand<Properties> {
/**
* Default value of maximum delta chain depth during aggressive garbage
* collection: {@value}
*
* @since 3.6
*/
public static final int DEFAULT_GC_AGGRESSIVE_DEPTH = 250;
/**
* Default window size during packing during aggressive garbage collection:
* * {@value}
*
* @since 3.6
*/
public static final int DEFAULT_GC_AGGRESSIVE_WINDOW = 250;
private ProgressMonitor monitor;
private Date expire;
private PackConfig pconfig;
/**
* Constructor for GarbageCollectCommand.
*
* @param repo
* a {@link org.eclipse.jgit.lib.Repository} object.
*/
protected GarbageCollectCommand(Repository repo) {
super(repo);
pconfig = new PackConfig(repo);
}
/**
* Set progress monitor
*
* @param monitor
* a progress monitor
* @return this instance
*/
public GarbageCollectCommand setProgressMonitor(ProgressMonitor monitor) {
this.monitor = monitor;
return this;
}
/**
* During gc() or prune() each unreferenced, loose object which has been
* created or modified after <code>expire</code> will not be pruned. Only
* older objects may be pruned. If set to null then every object is a
* candidate for pruning. Use {@link org.eclipse.jgit.util.GitDateParser} to
* parse time formats used by git gc.
*
* @param expire
* minimal age of objects to be pruned.
* @return this instance
*/
public GarbageCollectCommand setExpire(Date expire) {
this.expire = expire;
return this;
}
/**
* Whether to use aggressive mode or not. If set to true JGit behaves more
* similar to native git's "git gc --aggressive". If set to
* <code>true</code> compressed objects found in old packs are not reused
* but every object is compressed again. Configuration variables
* pack.window and pack.depth are set to 250 for this GC.
*
* @since 3.6
* @param aggressive
* whether to turn on or off aggressive mode
* @return this instance
*/
public GarbageCollectCommand setAggressive(boolean aggressive) {
if (aggressive) {
StoredConfig repoConfig = repo.getConfig();
pconfig.setDeltaSearchWindowSize(repoConfig.getInt(
ConfigConstants.CONFIG_GC_SECTION,
ConfigConstants.CONFIG_KEY_AGGRESSIVE_WINDOW,
DEFAULT_GC_AGGRESSIVE_WINDOW));
pconfig.setMaxDeltaDepth(repoConfig.getInt(
ConfigConstants.CONFIG_GC_SECTION,
ConfigConstants.CONFIG_KEY_AGGRESSIVE_DEPTH,
DEFAULT_GC_AGGRESSIVE_DEPTH));
pconfig.setReuseObjects(false);
} else
pconfig = new PackConfig(repo);
return this;
}
/**
* Whether to preserve old pack files instead of deleting them.
*
* @since 4.7
* @param preserveOldPacks
* whether to preserve old pack files
* @return this instance
*/
public GarbageCollectCommand setPreserveOldPacks(boolean preserveOldPacks) {
if (pconfig == null)
pconfig = new PackConfig(repo);
pconfig.setPreserveOldPacks(preserveOldPacks);
return this;
}
/**
* Whether to prune preserved pack files in the preserved directory.
*
* @since 4.7
* @param prunePreserved
* whether to prune preserved pack files
* @return this instance
*/
public GarbageCollectCommand setPrunePreserved(boolean prunePreserved) {
if (pconfig == null)
pconfig = new PackConfig(repo);
pconfig.setPrunePreserved(prunePreserved);
return this;
}
/** {@inheritDoc} */
@Override
public Properties call() throws GitAPIException {
checkCallable();
try {
if (repo instanceof FileRepository) {
GC gc = new GC((FileRepository) repo);
gc.setPackConfig(pconfig);
gc.setProgressMonitor(monitor);
if (this.expire != null)
gc.setExpire(expire);
try {
gc.gc().get();
return toProperties(gc.getStatistics());
} catch (ParseException | InterruptedException
| ExecutionException e) {
throw new JGitInternalException(JGitText.get().gcFailed, e);
}
} else if (repo instanceof DfsRepository) {
DfsGarbageCollector gc =
new DfsGarbageCollector((DfsRepository) repo);
gc.setPackConfig(pconfig);
gc.pack(monitor);
return new Properties();
} else {
throw new UnsupportedOperationException(MessageFormat.format(
JGitText.get().unsupportedGC,
repo.getClass().toString()));
}
} catch (IOException e) {
throw new JGitInternalException(JGitText.get().gcFailed, e);
}
}
/**
* Computes and returns the repository statistics.
*
* @return the repository statistics
* @throws org.eclipse.jgit.api.errors.GitAPIException
* thrown if the repository statistics cannot be computed
* @since 3.0
*/
public Properties getStatistics() throws GitAPIException {
try {
if (repo instanceof FileRepository) {
GC gc = new GC((FileRepository) repo);
return toProperties(gc.getStatistics());
}
return new Properties();
} catch (IOException e) {
throw new JGitInternalException(
JGitText.get().couldNotGetRepoStatistics, e);
}
}
@SuppressWarnings("boxing")
private static Properties toProperties(RepoStatistics stats) {
Properties p = new Properties();
p.put("numberOfBitmaps", stats.numberOfBitmaps); //$NON-NLS-1$
p.put("numberOfLooseObjects", stats.numberOfLooseObjects); //$NON-NLS-1$
p.put("numberOfLooseRefs", stats.numberOfLooseRefs); //$NON-NLS-1$
p.put("numberOfPackedObjects", stats.numberOfPackedObjects); //$NON-NLS-1$
p.put("numberOfPackedRefs", stats.numberOfPackedRefs); //$NON-NLS-1$
p.put("numberOfPackFiles", stats.numberOfPackFiles); //$NON-NLS-1$
p.put("sizeOfLooseObjects", stats.sizeOfLooseObjects); //$NON-NLS-1$
p.put("sizeOfPackedObjects", stats.sizeOfPackedObjects); //$NON-NLS-1$
return p;
}
}