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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.logserver;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.logging.Logger;
import java.util.logging.Level;
import com.yahoo.logserver.handlers.LogHandler;
/**
* @author Bjorn Borud
*/
public class Flusher extends Thread {
private static final Logger log = Logger.getLogger(Flusher.class.getName());
private static final Flusher instance;
private static final List<WeakReference<LogHandler>> logHandlers =
new ArrayList<WeakReference<LogHandler>>();
static {
instance = new Flusher();
instance.start();
}
Flusher() {
super("flusher");
}
public static synchronized void register(LogHandler logHandler) {
logHandlers.add(new WeakReference<>(logHandler));
}
public synchronized void run() {
try {
while(!isInterrupted()) {
Thread.sleep(2000);
Iterator<WeakReference<LogHandler>> it = logHandlers.iterator();
while (it.hasNext()) {
WeakReference<LogHandler> r = it.next();
LogHandler h = r.get();
if (h == null) {
it.remove();
} else {
h.flush();
}
if (log.isLoggable(LogLevel.DEBUG)) {
log.log(LogLevel.DEBUG, "Flushing " + h);
}
}
}
} catch (InterruptedException e) {
log.log(LogLevel.WARNING, "flusher was interrupted", e);
}
}
}
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