edu.scripps.fl.pipeline.SessionStage.java Source code

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Here is the source code for edu.scripps.fl.pipeline.SessionStage.java

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/*
 * Copyright 2010 The Scripps Research Institute
 *
 * 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 edu.scripps.fl.pipeline;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.pipeline.StageException;
import org.apache.commons.pipeline.stage.BaseStage;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;

/*
 * @author Mark Southern (southern at scripps dot edu)
 */
public abstract class SessionStage extends BaseStage {

    private Map<Thread, Session> sessions = new ConcurrentHashMap<Thread, Session>();
    private Map<Thread, Transaction> transactions = new ConcurrentHashMap<Thread, Transaction>();

    public abstract SessionFactory getSessionFactory();

    public Session getSession() {
        Session session = sessions.get(Thread.currentThread());
        if (session == null) {
            session = getSessionFactory().openSession();
            setSession(session);
            setTransaction(session.beginTransaction());
        }
        return session;
    }

    public void setSession(Session session) {
        sessions.put(Thread.currentThread(), session);
    }

    public Transaction getTransaction() {
        return transactions.get(Thread.currentThread());
    }

    public void setTransaction(Transaction transaction) {
        transactions.put(Thread.currentThread(), transaction);
    }

    @Override
    public void postprocess() throws StageException {
        try {
            for (Transaction tx : transactions.values())
                if (!tx.wasCommitted())
                    tx.commit();
            for (Session session : sessions.values()) {
                session.close();
            }
            sessions = null;
            transactions = null;
        } catch (Exception ex) {
            throw new StageException(this, ex);
        }
    }
}