/*
 * Copyright 2002-2004 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.hibernate;

import java.util.HashMap;
import java.util.Map;

import net.sf.hibernate.FlushMode;
import net.sf.hibernate.Session;
import net.sf.hibernate.Transaction;

import org.springframework.transaction.support.ResourceHolderSupport;

/**
 * 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 06.05.2003
 * @see HibernateTransactionManager
 * @see SessionFactoryUtils
 */
public class SessionHolder extends ResourceHolderSupport {

	private static final Object DEFAULT_KEY = new Object();

	private final Map sessionMap = new HashMap(1);

	private Transaction transaction;

	private FlushMode previousFlushMode;


	public SessionHolder(Session session) {
		addSession(DEFAULT_KEY, session);
	}

	public SessionHolder(Object key, Session session) {
		addSession(key, session);
	}


	public Session getSession() {
		return getSession(DEFAULT_KEY);
	}

	public Session getSession(Object key) {
		return (Session) this.sessionMap.get(key);
	}

	public Session getAnySession() {
		return (Session) this.sessionMap.values().iterator().next();
	}

	public void addSession(Object key, Session session) {
		this.sessionMap.put(key, session);
	}

	public Session removeSession(Object key) {
		return (Session) this.sessionMap.remove(key);
	}

	public boolean containsSession(Session session) {
		return this.sessionMap.containsValue(session);
	}

	public boolean isEmpty() {
		return this.sessionMap.isEmpty();
	}

	public boolean doesNotHoldNonDefaultSession() {
		return isEmpty() ||
		    (this.sessionMap.size() == 1 && this.sessionMap.containsKey(DEFAULT_KEY));
	}


	public void setTransaction(Transaction transaction) {
		this.transaction = transaction;
	}

	public Transaction getTransaction() {
		return transaction;
	}

	public void setPreviousFlushMode(FlushMode previousFlushMode) {
		this.previousFlushMode = previousFlushMode;
	}

	public FlushMode getPreviousFlushMode() {
		return previousFlushMode;
	}


	public void clear() {
		super.clear();
		this.transaction = null;
		this.previousFlushMode = null;
	}

}

@@ -663,16 +663,46 @@
 rnate;%0A%0A
+import java.util.Collections;%0A
 import j
@@ -719,16 +719,16 @@
 ashMap;%0A
-
 import j
@@ -1418,24 +1418,177 @@
  Object();%0A%0A
+%09/**%0A%09 * This Map needs to be synchronized because there might be multi-threaded%0A%09 * access in the case of JTA with remote transaction propagation.%0A%09 */%0A
 %09private fin
@@ -1607,16 +1607,44 @@
 onMap = 
+Collections.synchronizedMap(
 new Hash
@@ -1649,16 +1649,17 @@
 shMap(1)
+)
 ;%0A%0A%09priv
@@ -2080,32 +2080,106 @@
 tAnySession() %7B%0A
+%09%09synchronized (this.sessionMap) %7B%0A%09%09%09if (!this.sessionMap.isEmpty()) %7B%0A%09%09
 %09%09return (Sessio
@@ -2221,24 +2221,49 @@
 r().next();%0A
+%09%09%09%7D%0A%09%09%09return null;%0A%09%09%7D%0A
 %09%7D%0A%0A%09public 
@@ -2669,23 +2669,75 @@
 n() %7B%0A%09%09
-return 
+synchronized (this.sessionMap) %7B%0A%09%09%09return this.sessionMap.
 isEmpty(
@@ -2743,20 +2743,19 @@
 () %7C%7C%0A%09%09
-    
+%09%09%09
 (this.se
@@ -2821,16 +2821,20 @@
 _KEY));%0A
+%09%09%7D%0A
 %09%7D%0A%0A%0A%09pu

use synchronized sessionMap, allow getAnySession to work with empty sessionMap too