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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * // Copyright (c) 1998, 2007, Oracle. All rights reserved.
 * 
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to
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package oracle.toplink.essentials.internal.sequencing;

import oracle.toplink.essentials.sessions.Login;
import oracle.toplink.essentials.internal.sessions.DatabaseSessionImpl;
import oracle.toplink.essentials.internal.databaseaccess.Accessor;
import oracle.toplink.essentials.exceptions.ConcurrencyException;

class DatabaseSessionConnectionHandler implements SequencingConnectionHandler {
    DatabaseSessionConnectionHandler(DatabaseSessionImpl ownerSession, Login login) {
        this.ownerSession = ownerSession;
        this.login = login;
        accessor = login.buildAccessor();
    }

    DatabaseSessionImpl ownerSession;
    Login login;
    Accessor accessor;
    boolean isBusy;

    public void onConnect() {
        if (!isConnected()) {
            accessor.connect(login, ownerSession);
        }
    }

    public boolean isConnected() {
        return accessor.isConnected();
    }

    public synchronized Accessor acquireAccessor() {
        if (isBusy) {
            try {
                wait();// Notify is called when connection is released.
            } catch (InterruptedException exception) {
                throw ConcurrencyException.waitFailureOnSequencingForDatabaseSession(exception);
            }
        }
        isBusy = true;
        return accessor;
    }

    public synchronized void releaseAccessor(Accessor accessor) {
        isBusy = false;
        notify();
    }

    public void onDisconnect() {
        if (isConnected()) {
            accessor.disconnect(ownerSession);
        }
    }

    protected void finalize() throws Throwable {
        onDisconnect();
    }
}