/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* 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.intellij.util;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.Disposer;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
/**
* @author mike
*/
@SuppressWarnings({"NonPrivateFieldAccessedInSynchronizedContext"})
abstract class Timed<T> implements Disposable {
private static final Logger LOG = Logger.getInstance("#com.intellij.util.Timed");
private static final Map<Timed, Boolean> ourReferences = Collections.synchronizedMap(new WeakHashMap<Timed, Boolean>());
int myLastCheckedAccessCount;
int myAccessCount;
protected T myT;
boolean myPolled;
protected Timed(final Disposable parentDisposable) {
if (parentDisposable != null) {
Disposer.register(parentDisposable, this);
}
}
public synchronized void dispose() {
final Object t = myT;
myT = null;
if (t instanceof Disposable) {
Disposable disposable = (Disposable)t;
Disposer.dispose(disposable);
}
remove();
}
protected final void poll() {
if (!myPolled) {
ourReferences.put(this, Boolean.TRUE);
myPolled = true;
}
}
protected final void remove() {
ourReferences.remove(this);
myPolled = false;
}
protected synchronized boolean isLocked() {
return false;
}
static {
ScheduledExecutorService service = ConcurrencyUtil.newSingleScheduledThreadExecutor("timed reference disposer", Thread.MIN_PRIORITY + 1);
service.scheduleWithFixedDelay(new Runnable() {
public void run() {
try {
disposeTimed();
}
catch (Throwable e) {
LOG.error(e);
}
}
}, 60, 60, TimeUnit.SECONDS);
}
static void disposeTimed() {
final Timed[] references = ourReferences.keySet().toArray(new Timed[ourReferences.size()]);
for (Timed timed : references) {
if (timed == null) continue;
synchronized (timed) {
if (timed.myLastCheckedAccessCount == timed.myAccessCount && !timed.isLocked()) {
timed.dispose();
}
else {
timed.myLastCheckedAccessCount = timed.myAccessCount;
}
}
}
}
}