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TempFileProvider.java
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TempFileProvider.java
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/*
* JBoss, Home of Professional Open Source
* Copyright 2009, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.vfs;
import java.io.File;
import java.io.IOException;
import java.io.Closeable;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.Random;
/**
* A provider for temporary physical files and directories.
*
* @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
*/
public final class TempFileProvider implements Closeable {
private static final String JBOSS_TMP_DIR_PROPERTY = "jboss.server.temp.dir";
private static final String JVM_TMP_DIR_PROPERTY = "java.io.tmpdir";
private static final File TMP_ROOT;
private static final int RETRIES = 10;
private final AtomicBoolean open = new AtomicBoolean(true);
static {
String configTmpDir = System.getProperty(JBOSS_TMP_DIR_PROPERTY);
if (configTmpDir == null)
configTmpDir = System.getProperty(JVM_TMP_DIR_PROPERTY);
try {
TMP_ROOT = new File(configTmpDir, "vfs");
TMP_ROOT.mkdirs();
}
catch (Exception e) {
throw new RuntimeException("Can't set up temp file provider", e);
}
}
/**
* Create a temporary file provider for a given type.
*
* @param providerType the provider type string (used as a prefix in the temp file dir name)
*
* @return the new provider
*
* @throws IOException if an I/O error occurs
*/
public static TempFileProvider create(String providerType, ScheduledExecutorService executor) throws IOException {
return new TempFileProvider(createTempDir(providerType, "", TMP_ROOT), executor);
}
private final File providerRoot;
private final ScheduledExecutorService executor;
private TempFileProvider(File providerRoot, ScheduledExecutorService executor) {
this.providerRoot = providerRoot;
this.executor = executor;
}
/**
* Create a temp directory, into which temporary files may be placed.
*
* @param originalName the original file name
*
* @return the temp directory
*
* @throws IOException
*/
public TempDir createTempDir(String originalName) throws IOException {
if (!open.get()) {
throw new IOException("Temp file provider closed");
}
final String name = createTempName(originalName + "-", "");
final File f = new File(providerRoot, name);
for (int i = 0; i < RETRIES; i++) {
if (f.mkdir())
return new TempDir(this, f);
}
final IOException eo = new IOException(
String.format("Could not create directory for original name '%s' after %d attempts", originalName, Integer.valueOf(RETRIES)));
throw eo;
}
private static final Random rng = new Random();
private static File createTempDir(String prefix, String suffix, File root) throws IOException {
for (int i = 0; i < RETRIES; i++) {
final File f = new File(root, createTempName(prefix, suffix));
if (f.mkdir())
return f;
}
final IOException eo = new IOException(
String.format("Could not create directory for root '%s' (prefix '%s', suffix '%s') after %d attempts",
root,
prefix,
suffix));
throw eo;
}
static String createTempName(String prefix, String suffix) {
return prefix + Long.toHexString(rng.nextLong()) + suffix;
}
/**
* Close this provider and delete any temp files associated with it.
*/
public void close() throws IOException {
if (open.getAndSet(false)) {
new DeleteTask(providerRoot).run();
}
}
protected void finalize() {
VFSUtils.safeClose(this);
}
class DeleteTask implements Runnable {
private final File root;
public DeleteTask(File root) {
this.root = root;
}
public void run() {
if (!VFSUtils.recursiveDelete(root)) {
executor.schedule(this, 30L, TimeUnit.SECONDS);
}
}
}
}