org.gradle.internal.resource.local.PathKeyFileStore Maven / Gradle / Ivy
Show all versions of gradle-api Show documentation
/*
* Copyright 2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.gradle.internal.resource.local;
import org.gradle.api.Action;
import org.gradle.api.GradleException;
import org.gradle.api.file.EmptyFileVisitor;
import org.gradle.api.file.FileVisitDetails;
import org.gradle.api.internal.file.IdentityFileResolver;
import org.gradle.api.internal.file.collections.MinimalFileTree;
import org.gradle.api.internal.file.collections.SingleIncludePatternFileTree;
import org.gradle.api.internal.file.delete.Deleter;
import org.gradle.util.GFileUtils;
import java.io.File;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import static org.gradle.internal.FileUtils.hasExtension;
/**
* File store that accepts the target path as the key for the entry.
*
* This implementation is explicitly NOT THREAD SAFE. Concurrent access must be organised externally.
*
* There is always at most one entry for a given key for this file store. If an entry already exists at the given path, it will be overwritten.
* Paths can contain directory components, which will be created on demand.
*
* This file store is self repairing in so far that any files partially written before a fatal error will be ignored and
* removed at a later time.
*
* This file store also provides searching via relative ant path patterns.
*/
public class PathKeyFileStore implements FileStore, FileStoreSearcher {
/*
When writing a file into the filestore a marker file with this suffix is written alongside,
then removed after the write. This is used to detect partially written files (due to a serious crash)
and to silently clean them.
*/
public static final String IN_PROGRESS_MARKER_FILE_SUFFIX = ".fslck";
private File baseDir;
private final Deleter deleter;
public PathKeyFileStore(File baseDir) {
this.baseDir = baseDir;
IdentityFileResolver fileResolver = new IdentityFileResolver();
deleter = new Deleter(fileResolver, fileResolver.getFileSystem());
}
protected File getBaseDir() {
return baseDir;
}
public LocallyAvailableResource move(String path, File source) {
return saveIntoFileStore(source, getFile(path), true);
}
public LocallyAvailableResource copy(String path, File source) {
return saveIntoFileStore(source, getFile(path), false);
}
private File getFile(String path) {
return new File(baseDir, path);
}
private File getFileWhileCleaningInProgress(String path) {
File file = getFile(path);
File markerFile = getInProgressMarkerFile(file);
if (markerFile.exists()) {
deleter.delete(file);
deleter.delete(markerFile);
}
return file;
}
public void moveFilestore(File destination) {
if (baseDir.exists()) {
GFileUtils.moveDirectory(baseDir, destination);
}
baseDir = destination;
}
public LocallyAvailableResource add(String path, Action addAction) {
String error = String.format("Failed to add into filestore '%s' at '%s' ", getBaseDir().getAbsolutePath(), path);
return doAdd(getFile(path), error, addAction);
}
protected LocallyAvailableResource saveIntoFileStore(final File source, final File destination, final boolean isMove) {
String verb = isMove ? "move" : "copy";
if (!source.exists()) {
throw new GradleException(String.format("Cannot %s '%s' into filestore @ '%s' as it does not exist", verb, source, destination));
}
String error = String.format("Failed to %s file '%s' into filestore at '%s' ", verb, source, destination);
return doAdd(destination, error, new Action() {
public void execute(File file) {
if (isMove) {
GFileUtils.moveFile(source, destination);
} else {
GFileUtils.copyFile(source, destination);
}
}
});
}
protected LocallyAvailableResource doAdd(File destination, String failureDescription, Action action) {
try {
GFileUtils.parentMkdirs(destination);
File inProgressMarkerFile = getInProgressMarkerFile(destination);
GFileUtils.touch(inProgressMarkerFile);
try {
deleter.delete(destination);
action.execute(destination);
} catch (Throwable t) {
deleter.delete(destination);
throw t;
} finally {
deleter.delete(inProgressMarkerFile);
}
} catch (Throwable t) {
throw new GradleException(failureDescription, t);
}
return entryAt(destination);
}
public Set search(String pattern) {
if (!getBaseDir().exists()) {
return Collections.emptySet();
}
final Set entries = new HashSet();
findFiles(pattern).visit(new EmptyFileVisitor() {
public void visitFile(FileVisitDetails fileDetails) {
final File file = fileDetails.getFile();
// We cannot clean in progress markers, or in progress files here because
// the file system visitor stuff can't handle the file system mutating while visiting
if (!isInProgressMarkerFile(file) && !isInProgressFile(file)) {
entries.add(entryAt(file));
}
}
});
return entries;
}
private File getInProgressMarkerFile(File file) {
return new File(file.getParent(), file.getName() + IN_PROGRESS_MARKER_FILE_SUFFIX);
}
private boolean isInProgressMarkerFile(File file) {
return hasExtension(file, IN_PROGRESS_MARKER_FILE_SUFFIX);
}
private boolean isInProgressFile(File file) {
return getInProgressMarkerFile(file).exists();
}
private MinimalFileTree findFiles(String pattern) {
return new SingleIncludePatternFileTree(baseDir, pattern);
}
protected LocallyAvailableResource entryAt(File file) {
return entryAt(GFileUtils.relativePath(baseDir, file));
}
protected LocallyAvailableResource entryAt(final String path) {
return new AbstractLocallyAvailableResource() {
public File getFile() {
// Calculated on demand to deal with moves
return new File(baseDir, path);
}
};
}
public LocallyAvailableResource get(String key) {
final File file = getFileWhileCleaningInProgress(key);
if (file.exists()) {
return entryAt(file);
} else {
return null;
}
}
}