/*
* Copyright 2002-2008 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.springframework.orm.hibernate3;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.hibernate.FlushMode;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.springframework.transaction.support.ResourceHolderSupport;
import org.springframework.util.Assert;
/**
* Session holder, wrapping a Hibernate Session and a Hibernate Transaction.
* HibernateTransactionManager binds instances of this class to the thread,
* for a given SessionFactory.
*
* <p>Note: This is an SPI class, not intended to be used by applications.
*
* @author Juergen Hoeller
* @since 1.2
* @see HibernateTransactionManager
* @see SessionFactoryUtils
*/
public class SessionHolder extends ResourceHolderSupport {
private static final Object DEFAULT_KEY = new Object();
/**
* This Map needs to be synchronized because there might be multi-threaded
* access in the case of JTA with remote transaction propagation.
*/
private final Map<Object, Session> sessionMap = Collections.synchronizedMap(new HashMap<Object, Session>(1));
private Transaction transaction;
private FlushMode previousFlushMode;
public SessionHolder(Session session) {
addSession(session);
}
public SessionHolder(Object key, Session session) {
addSession(key, session);
}
public Session getSession() {
return getSession(DEFAULT_KEY);
}
public Session getSession(Object key) {
return this.sessionMap.get(key);
}
public Session getValidatedSession() {
return getValidatedSession(DEFAULT_KEY);
}
public Session getValidatedSession(Object key) {
Session session = this.sessionMap.get(key);
// Check for dangling Session that's around but already closed.
// Effectively an assertion: that should never happen in practice.
// We'll seamlessly remove the Session here, to not let it cause
// any side effects.
if (session != null && !session.isOpen()) {
this.sessionMap.remove(key);
session = null;
}
return session;
}
public Session getAnySession() {
synchronized (this.sessionMap) {
if (!this.sessionMap.isEmpty()) {
return this.sessionMap.values().iterator().next();
}
return null;
}
}
public void addSession(Session session) {
addSession(DEFAULT_KEY, session);
}
public void addSession(Object key, Session session) {
Assert.notNull(key, "Key must not be null");
Assert.notNull(session, "Session must not be null");
this.sessionMap.put(key, session);
}
public Session removeSession(Object key) {
return this.sessionMap.remove(key);
}
public boolean containsSession(Session session) {
return this.sessionMap.containsValue(session);
}
public boolean isEmpty() {
return this.sessionMap.isEmpty();
}
public boolean doesNotHoldNonDefaultSession() {
synchronized (this.sessionMap) {
return this.sessionMap.isEmpty() ||
(this.sessionMap.size() == 1 && this.sessionMap.containsKey(DEFAULT_KEY));
}
}
public void setTransaction(Transaction transaction) {
this.transaction = transaction;
}
public Transaction getTransaction() {
return this.transaction;
}
public void setPreviousFlushMode(FlushMode previousFlushMode) {
this.previousFlushMode = previousFlushMode;
}
public FlushMode getPreviousFlushMode() {
return this.previousFlushMode;
}
@Override
public void clear() {
super.clear();
this.transaction = null;
this.previousFlushMode = null;
}
}
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