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/*
* Copyright 2011 gitblit.com.
*
* 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 com.gitblit;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Properties;
/**
* Dynamically loads and reloads a properties file by keeping track of the last
* modification date.
*
* @author James Moger
*
*/
public class FileSettings extends IStoredSettings {
protected final File propertiesFile;
private final Properties properties = new Properties();
private volatile long lastModified;
public FileSettings(String file) {
super(FileSettings.class);
this.propertiesFile = new File(file);
}
/**
* Returns a properties object which contains the most recent contents of
* the properties file.
*/
@Override
protected synchronized Properties read() {
if (propertiesFile.exists() && (propertiesFile.lastModified() > lastModified)) {
FileInputStream is = null;
try {
Properties props = new Properties();
is = new FileInputStream(propertiesFile);
props.load(is);
// load properties after we have successfully read file
properties.clear();
properties.putAll(props);
lastModified = propertiesFile.lastModified();
} catch (FileNotFoundException f) {
// IGNORE - won't happen because file.exists() check above
} catch (Throwable t) {
logger.error("Failed to read " + propertiesFile.getName(), t);
} finally {
if (is != null) {
try {
is.close();
} catch (Throwable t) {
// IGNORE
}
}
}
}
return properties;
}
/**
* @return the last modification date of the properties file
*/
protected long lastModified() {
return lastModified;
}
@Override
public String toString() {
return propertiesFile.getAbsolutePath();
}
}
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