/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat licenses this file to you 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 org.jboss.netty.util.internal;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import android.util.Log;
/**
* Warn when user creates too many instances to avoid {@link OutOfMemoryError}.
*
* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
* @version $Rev: 2234 $, $Date: 2010-04-06 18:23:25 +0900 (Tue, 06 Apr 2010) $
*/
public class SharedResourceMisuseDetector {
private static final int MAX_ACTIVE_INSTANCES = 256;
private final Class<?> type;
private final AtomicLong activeInstances = new AtomicLong();
private final AtomicBoolean logged = new AtomicBoolean();
public SharedResourceMisuseDetector(Class<?> type) {
if (type == null) {
throw new NullPointerException("type");
}
this.type = type;
}
public void increase() {
if (activeInstances.incrementAndGet() > MAX_ACTIVE_INSTANCES) {
if (logged.compareAndSet(false, true)) {
Log.d("",
"You are creating too many " + type.getSimpleName() +
" instances. " + type.getSimpleName() +
" is a shared resource that must be reused across the" +
" application, so that only a few instances are created.");
}
}
}
public void decrease() {
activeInstances.decrementAndGet();
}
}