/*
* The MIT License
*
* Copyright (c) 2004-2009, Sun Microsystems, Inc., Kohsuke Kawaguchi
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package hudson.logging;
import java.io.UnsupportedEncodingException;
import java.lang.ref.WeakReference;
import java.util.logging.ErrorManager;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;
/**
* Delegating {@link Handler} that uses {@link WeakReference},
* which de-registers itself when an object disappears via GC.
*/
public final class WeakLogHandler extends Handler {
private final WeakReference<Handler> target;
private final Logger logger;
public WeakLogHandler(Handler target, Logger logger) {
this.logger = logger;
logger.addHandler(this);
this.target = new WeakReference<Handler>(target);
}
public void publish(LogRecord record) {
Handler t = resolve();
if(t!=null)
t.publish(record);
}
public void flush() {
Handler t = resolve();
if(t!=null)
t.flush();
}
public void close() throws SecurityException {
Handler t = resolve();
if(t!=null)
t.close();
}
private Handler resolve() {
Handler r = target.get();
if(r==null)
logger.removeHandler(this);
return r;
}
@Override
public void setFormatter(Formatter newFormatter) throws SecurityException {
super.setFormatter(newFormatter);
Handler t = resolve();
if(t!=null)
t.setFormatter(newFormatter);
}
@Override
public void setEncoding(String encoding) throws SecurityException, UnsupportedEncodingException {
super.setEncoding(encoding);
Handler t = resolve();
if(t!=null)
t.setEncoding(encoding);
}
@Override
public void setFilter(Filter newFilter) throws SecurityException {
super.setFilter(newFilter);
Handler t = resolve();
if(t!=null)
t.setFilter(newFilter);
}
@Override
public void setErrorManager(ErrorManager em) {
super.setErrorManager(em);
Handler t = resolve();
if(t!=null)
t.setErrorManager(em);
}
@Override
public void setLevel(Level newLevel) throws SecurityException {
super.setLevel(newLevel);
Handler t = resolve();
if(t!=null)
t.setLevel(newLevel);
}
@Override
public boolean isLoggable(LogRecord record) {
Handler t = resolve();
if(t!=null)
return t.isLoggable(record);
else
return super.isLoggable(record);
}
}