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 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
 * "License"); you may not use this file except in compliance   *
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 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
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package org.apache.james.mailbox.jpa.mail;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceException;

import org.apache.james.mailbox.MailboxPathLocker;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.exception.MailboxException;
import org.apache.james.mailbox.jpa.mail.model.JPAMailbox;
import org.apache.james.mailbox.store.mail.AbstractLockingUidProvider;
import org.apache.james.mailbox.store.mail.model.Mailbox;

public class JPAUidProvider extends AbstractLockingUidProvider{

    private EntityManagerFactory factory;

    public JPAUidProvider(MailboxPathLocker locker, EntityManagerFactory factory) {
        super(locker);
        this.factory = factory;
    }
    
    
    @Override
    public long lastUid(MailboxSession session, Mailbox mailbox) throws MailboxException {
        EntityManager manager = null;
        try {
            manager = factory.createEntityManager();
            manager.getTransaction().begin();
            long uid = (Long) manager.createNamedQuery("findLastUid").setParameter("idParam", mailbox.getMailboxId()).getSingleResult();
            manager.getTransaction().commit();
            return uid;
        } catch (PersistenceException e) {
            if (manager != null && manager.getTransaction().isActive()) {
                manager.getTransaction().rollback();
            }
            throw new MailboxException("Unable to get last uid for mailbox " + mailbox, e);
        } finally {
            if (manager != null) {
                manager.close();
            }
        }
    }

    @Override
    protected long lockedNextUid(MailboxSession session, Mailbox mailbox) throws MailboxException {
        EntityManager manager = null;
        try {
            manager = factory.createEntityManager();
            manager.getTransaction().begin();
            JPAMailbox m = manager.find(JPAMailbox.class, mailbox.getMailboxId());
            long uid = m.consumeUid();
            manager.persist(m);
            manager.getTransaction().commit();
            return uid;
        } catch (PersistenceException e) {
            if (manager != null && manager.getTransaction().isActive()) {
                manager.getTransaction().rollback();
            }
            throw new MailboxException("Unable to save next uid for mailbox " + mailbox, e);
        } finally {
            if (manager != null) {
                manager.close();
            }
        }
    }

}