/*
* RHQ Management Platform
* Copyright (C) 2005-2008 Red Hat, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation, and/or the GNU Lesser
* General Public License, version 2.1, also as published by the Free
* Software Foundation.
*
* This program 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 General Public License and the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* and the GNU Lesser General Public License along with this program;
* if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.rhq.plugins.platform.content.yum;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
class PrimaryMD5 {
private final File directory;
private static final ReentrantLock lock = new ReentrantLock();
private final Log log = LogFactory.getLog(PrimaryMD5.class);
PrimaryMD5(File directory) {
this.directory = directory;
}
String read() throws IOException {
String content = null;
BufferedReader reader = null;
File file = file();
lock.lock();
try {
if (file.exists()) {
reader = new BufferedReader(new FileReader(file));
content = reader.readLine();
}
} catch (Exception e) {
log.error("primary.md5 - read failed\n" + e);
} finally {
lock.unlock();
if (reader != null) {
reader.close();
}
}
return content;
}
void write(String content) throws IOException {
BufferedWriter writer = null;
lock.lock();
try {
writer = new BufferedWriter(new FileWriter(file()));
writer.write(content);
writer.flush();
log.info("primary.md5 updated: " + content);
} catch (IOException e) {
log.error("primary.md5 - update failed\n" + e);
throw e;
} finally {
lock.unlock();
if (writer != null) {
writer.close();
}
}
}
void delete() {
file().delete();
}
long lastModified() {
return file().lastModified();
}
boolean matches(String content) throws IOException {
return content.equals(read());
}
private File file() {
return new File(directory, "primary.md5");
}
}