/*******************************************************************************
*
* Copyright (c) 2004-2009 Oracle Corporation.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
*
* Kohsuke Kawaguchi
*
*
*******************************************************************************/
package hudson.model;
import hudson.Extension;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.util.logging.Level;
import java.util.regex.Pattern;
/**
* Scans the fingerprint database and remove old records that are no longer
* relevant.
*
* <p> A {@link Fingerprint} is removed when none of the builds that it point to
* is available in the records.
*
* @author Kohsuke Kawaguchi
*/
@Extension
public final class FingerprintCleanupThread extends AsyncPeriodicWork {
private static FingerprintCleanupThread theInstance;
public FingerprintCleanupThread() {
super("Fingerprint cleanup");
theInstance = this;
}
public long getRecurrencePeriod() {
return DAY;
}
public static void invoke() {
theInstance.run();
}
protected void execute(TaskListener listener) {
int numFiles = 0;
File root = new File(Hudson.getInstance().getRootDir(), "fingerprints");
File[] files1 = root.listFiles(LENGTH2DIR_FILTER);
if (files1 != null) {
for (File file1 : files1) {
File[] files2 = file1.listFiles(LENGTH2DIR_FILTER);
for (File file2 : files2) {
File[] files3 = file2.listFiles(FINGERPRINTFILE_FILTER);
for (File file3 : files3) {
if (check(file3)) {
numFiles++;
}
}
deleteIfEmpty(file2);
}
deleteIfEmpty(file1);
}
}
logger.log(Level.INFO, "Cleaned up " + numFiles + " records");
}
/**
* Deletes a directory if it's empty.
*/
private void deleteIfEmpty(File dir) {
String[] r = dir.list();
if (r == null) {
return; // can happen in a rare occasion
}
if (r.length == 0) {
dir.delete();
}
}
/**
* Examines the file and returns true if a file was deleted.
*/
private boolean check(File fingerprintFile) {
try {
Fingerprint fp = Fingerprint.load(fingerprintFile);
if (!fp.isAlive()) {
fingerprintFile.delete();
return true;
}
} catch (IOException e) {
logger.log(Level.WARNING, "Failed to process " + fingerprintFile, e);
}
return false;
}
private static final FileFilter LENGTH2DIR_FILTER = new FileFilter() {
public boolean accept(File f) {
return f.isDirectory() && f.getName().length() == 2;
}
};
private static final FileFilter FINGERPRINTFILE_FILTER = new FileFilter() {
private final Pattern PATTERN = Pattern.compile("[0-9a-f]{28}\\.xml");
public boolean accept(File f) {
return f.isFile() && PATTERN.matcher(f.getName()).matches();
}
};
}