org.apache.tapestry5.BaseOptimizedSessionPersistedObject Maven / Gradle / Ivy
// Copyright 2008, 2009, 2011 The Apache Software Foundation
//
// 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.apache.tapestry5;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Base implementation of
* {@link org.apache.tapestry5.OptimizedSessionPersistedObject}. Subclasses
* should invoke {@link #markDirty()} after the internal state of the object changes.
*
* Due to the concurrent nature of session attributes it's important that markDirty occurs after
* the object has been changed. If the change occurs before the object has been mutated it's possible that another
* thread may re-store the object before the changes are actually made!
*
* @since 5.1.1.0
*/
public abstract class BaseOptimizedSessionPersistedObject implements OptimizedSessionPersistedObject
{
private transient AtomicBoolean dirty = new AtomicBoolean(false);
public final boolean checkAndResetDirtyMarker()
{
return dirty.getAndSet(false);
}
/**
* Invoked by the subclass after internal state of the object changes.
*/
protected final void markDirty()
{
dirty.set(true);
}
}