/*

 * Copyright (c) 2004, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.tools.jconsole;

import java.awt.*;

import javax.swing.*;

public abstract class Tab extends JPanel {

    private String name;

    private Worker worker;

    protected VMPanel vmPanel;

    private SwingWorker<?, ?> prevSW;

    public Tab(VMPanel vmPanel, String name) {

        this.vmPanel = vmPanel;

        this.name = name;

    }

    public SwingWorker<?, ?> newSwingWorker() {

        return null;

    }

    public void update() {

        final ProxyClient proxyClient = vmPanel.getProxyClient();

        if (!proxyClient.hasPlatformMXBeans()) {

            throw new UnsupportedOperationException(

                "Platform MXBeans not registered in MBeanServer");

        }

        SwingWorker<?,?> sw = newSwingWorker();

        // schedule SwingWorker to run only if the previous

        // SwingWorker has finished its task and it hasn't started.

        if (prevSW == null || prevSW.isDone()) {

            if (sw == null || sw.getState() == SwingWorker.StateValue.PENDING) {

                prevSW = sw;

                if (sw != null) {

                    sw.execute();

                }

            }

        }

    }

    public synchronized void dispose() {

        if(worker != null)

            worker.stopWorker();

        // Subclasses will override to clean up

    }

    protected VMPanel getVMPanel() {

        return vmPanel;

    }

    OverviewPanel[] getOverviewPanels() {

        return null;

    }

    public synchronized void workerAdd(Runnable job) {

        if (worker == null) {

            worker = new Worker(name+"-"+vmPanel.getConnectionName());

            worker.start();

        }

        worker.add(job);

    }

    public Dimension getPreferredSize() {

        return new Dimension(700, 500);

    }

}