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DirectoryBasedRepository.java
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DirectoryBasedRepository.java
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/*
* Copyright (c) 2007, 2024 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.enterprise.module.common_impl;
import com.sun.enterprise.module.ModuleDefinition;
import com.sun.enterprise.module.RepositoryChangeListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileFilter;
import java.net.URI;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.locks.ReentrantLock;
/**
* This class is a directory based repository implementation. This mean that all jar
* file residing a particular directory will be elligible to be added to this
* repository instance. Jar File will need to be compliant with the module definition
* spec which mean have a manifest file with the correct elements OR a separate
* manifest file with the same file name with a .mf extension.
*
* @author Jerome Dochez
*/
public class DirectoryBasedRepository extends AbstractRepositoryImpl {
protected final File repository;
private final ReentrantLock lock = new ReentrantLock();
private final int intervalInMs = Integer.getInteger("hk2.file.directory.changeIntervalTimer", 1000);
private Timer timer;
private boolean isTimerThreadDaemon = false;
private List<File> subDirectories;
/** Creates a new instance of DirectoryBasedRepository */
public DirectoryBasedRepository(String name, File repository) {
super(name,repository.toURI());
this.repository = repository;
}
private void initializeSubDirectories() {
if (subDirectories != null) return;
subDirectories = new LinkedList<File>();
for (File file : repository.listFiles(new FileFilter() {
public boolean accept(File pathname) {
return pathname.isDirectory();
}
})) {
subDirectories.add(file);
}
}
public DirectoryBasedRepository(String name, File repository, boolean isTimerThreadDaemon) {
this(name, repository);
this.isTimerThreadDaemon = isTimerThreadDaemon;
}
@Override
public boolean addListener(RepositoryChangeListener listener) {
lock.lock();
try {
final boolean returnValue = super.addListener(listener);
if (returnValue && timer==null) {
initializeSubDirectories();
timer = new Timer("hk2-repo-listener-"+ this.getName(), isTimerThreadDaemon);
timer.schedule(new TimerTask() {
private final ReentrantLock lock = new ReentrantLock();
long lastModified = repository.lastModified();
public void run() {
lock.lock();
try {
if (lastModified<repository.lastModified()) {
lastModified = repository.lastModified();
// something has changed, look into this...
directoryChanged();
}
} finally {
lock.unlock();
}
}
}, intervalInMs, intervalInMs);
timer.purge();
}
return returnValue;
} finally {
lock.unlock();
}
}
@Override
public void shutdown() throws IOException {
if (timer!=null) {
timer.cancel();
timer = null;
}
}
protected void loadModuleDefs(Map<ModuleId, ModuleDefinition> moduleDefs, List<URI> libraries) throws IOException {
if (!repository.exists()) {
throw new FileNotFoundException(repository.getAbsolutePath());
}
try {
File[] files = repository.listFiles();
for (File aFile : files) {
if (aFile.getName().endsWith(".jar") && !isDisabled(aFile)) {
ModuleDefinition moduleDef = loadJar(aFile);
if (moduleDef!=null) {
moduleDefs.put(AbstractFactory.getInstance().createModuleId(moduleDef), moduleDef);
} else {
libraries.add(aFile.toURI());
}
}
}
} catch (IOException e) {
IOException x = new IOException("Failed to load modules from " + repository);
x.initCause(e);
throw x;
}
}
/**
* Checks the <tt>xyz.disabled</tt> file for <tt>xyz.jar</tt> and return true
* if the file exists.
*/
protected boolean isDisabled(File jar) {
String fileName = jar.getName();
fileName = fileName.substring(0,fileName.lastIndexOf('.'))+".disabled";
File disabledFile = new File(jar.getParent(),fileName);
return disabledFile.exists();
}
private void directoryChanged() {
lock.lock();
try {
// not the most efficient implementation, could be revisited later
HashMap<ModuleId, ModuleDefinition> newModuleDefs =
new HashMap<ModuleId, ModuleDefinition>();
List<URI> libraries = new LinkedList<URI>();
try {
loadModuleDefs(newModuleDefs, libraries);
} catch(IOException ioe) {
// we probably need to wait until the jar has finished being copied
// XXX add some form of retry
}
for(ModuleDefinition def : newModuleDefs.values()) {
if (find(def.getName(), def.getVersion())==null) {
add(def);
for (RepositoryChangeListener listener : listeners) {
listener.moduleAdded(def);
}
}
}
for (ModuleDefinition def : findAll()) {
if (!newModuleDefs.containsKey(AbstractFactory.getInstance().createModuleId(def))) {
remove(def);
for (RepositoryChangeListener listener : listeners) {
listener.moduleRemoved(def);
}
}
}
List<URI> originalLibraries = super.getJarLocations();
for (URI location : libraries) {
if (!originalLibraries.contains(location)) {
addLibrary(location);
for (RepositoryChangeListener listener : listeners) {
listener.added(location);
}
}
}
if (originalLibraries.size()>0) {
List<URI> copy = new LinkedList<URI>();
copy.addAll(originalLibraries);
for (URI originalLocation : copy) {
if (!libraries.contains(originalLocation)) {
removeLibrary(originalLocation);
for (RepositoryChangeListener listener : listeners) {
listener.removed(originalLocation);
}
}
}
}
// added or removed subdirectories ?
List<File> previous = new LinkedList<File>();
previous.addAll(subDirectories);
for (File file : repository.listFiles(new FileFilter() {
public boolean accept(File pathname) {
return pathname.isDirectory();
}
})) {
// added ?
if (!subDirectories.contains(file)) {
for (RepositoryChangeListener listener : listeners) {
listener.added(file.toURI());
}
subDirectories.add(file);
} else {
// known, removing it from the copied list to check
// for removal
previous.remove(file);
}
}
// any left in our copy is a removed sub directory.
if (!previous.isEmpty()) {
for (File file : previous) {
for (RepositoryChangeListener listener : listeners) {
listener.removed(file.toURI());
}
subDirectories.remove(file);
}
}
} finally {
lock.unlock();
}
}
}