| // 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.io.IOException; |
| import java.io.Serializable; |
| 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 <strong>after</strong> |
| * 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, Serializable |
| { |
| private static final long serialVersionUID = 172352928643322125L; |
| |
| private transient AtomicBoolean dirty = new AtomicBoolean(false); |
| |
| private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException { |
| 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); |
| } |
| } |