/*
* Copyright 2007 The Fornax Project Team, including the original
* author or authors.
*
* 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.sculptor.framework.accessimpl.jpa;
import java.io.Serializable;
import javax.persistence.LockModeType;
import javax.persistence.PersistenceException;
import org.sculptor.framework.accessapi.FindByIdAccess;
/**
* <p>
* Find an entity by its id. Implementation of Access command FindByIdAccess.
* </p>
* <p>
* Command design pattern.
* </p>
*/
public class JpaFindByIdAccessImpl<T, ID extends Serializable> extends JpaAccessBase<T> implements
FindByIdAccess<T, ID> {
private boolean lock;
private ID id;
private T result;
public JpaFindByIdAccessImpl(Class<T> persistentClass) {
setPersistentClass(persistentClass);
}
protected boolean isLock() {
return lock;
}
public void setLock(boolean lock) {
this.lock = lock;
}
protected ID getId() {
return id;
}
public void setId(ID id) {
this.id = id;
}
public T getResult() {
return result;
}
protected void setResult(T result) {
this.result = result;
}
public void performExecute() throws PersistenceException {
result = (T) getEntityManager().find(getPersistentClass(), id);
if (lock) {
// use pessimistic locking strategy
getEntityManager().lock(result, LockModeType.WRITE);
}
}
}