/*
* Copyright 2010 NCHOVY
*
* 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 org.krakenapps.util;
import java.io.Closeable;
import java.io.IOException;
public abstract class Managed implements Closeable {
private volatile boolean closing = false;
private volatile boolean closed = false;
private final SingletonRegistry<?, ? extends Managed> registry;
private final Object key;
public Managed(SingletonRegistry<?, ? extends Managed> r, Object k) {
this.registry = r;
this.key = k;
}
public boolean isOpen() {
return closing == false;
}
public boolean isClosing() {
return closing == true && closed == false;
}
public boolean isClosed() {
return closing == true && closed == true;
}
protected abstract void onClose() throws IOException;
protected abstract void errorOnClosing(Throwable e);
@Override
public void close() throws IOException {
if (closing)
return;
try {
synchronized (this) {
closing = true;
onClose();
notifyAll();
closed = true;
}
if (registry != null)
registry.dispose(key);
} catch (IOException e) {
errorOnClosing(e);
}
}
}