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eFaps is a framework used to map objects with or without attached files to a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface. The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.

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/*
 * Copyright 2003 - 2014 The eFaps Team
 *
 * 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.
 *
 * Revision:        $Rev$
 * Last Changed:    $Date$
 * Last Changed By: $Author$
 */

package org.efaps.bpm.transaction;

import java.sql.Connection;
import java.sql.SQLException;

import org.efaps.db.Context;
import org.efaps.db.transaction.ConnectionResource;
import org.efaps.util.EFapsException;
import org.hibernate.engine.jdbc.connections.internal.UserSuppliedConnectionProviderImpl;

/**
 * TODO comment!
 *
 * @author The eFaps Team
 * @version $Id$
 */
public class ConnectionProvider
    extends UserSuppliedConnectionProviderImpl
{
    /**
     *
     */
    private static final long serialVersionUID = 1L;

    /**
     * The ConnectionResource used for Hibernate.
     */
    private ConnectionResource connectionResource;

    /**
     * Obtains a connection for Hibernate use according to the underlying
     * strategy of this provider.
     *
     * @return The obtained JDBC connection
     *
     * @throws SQLException Indicates a problem opening a connection
     */
    @Override
    public Connection getConnection()
        throws SQLException
    {
        try {
            this.connectionResource = Context.getThreadContext().getConnectionResource();
            return this.connectionResource.getConnection();
        } catch (final EFapsException e) {
            throw new SQLException(e);
        }
    }

    /**
     * Release a connection from Hibernate use.
     *
     * @param _conn The JDBC connection to release
     *
     * @throws SQLException Indicates a problem closing the connection
     */
    @Override
    public void closeConnection(final Connection _conn)
        throws SQLException
    {
        if (this.connectionResource != null) {
            try {
                Context.getThreadContext().returnConnectionResource(this.connectionResource);
                this.connectionResource = null;
            } catch (final EFapsException e) {
                throw new SQLException(e);
            }
        }
    }
}