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