org.jactr.eclipse.runtime.launching.session.SessionTracker.java Source code

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Here is the source code for org.jactr.eclipse.runtime.launching.session.SessionTracker.java

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/*
 * Created on Jun 14, 2007 Copyright (C) 2001-5, Anthony Harrison anh23@pitt.edu
 * (jactr.org) This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the License,
 * or (at your option) any later version. This library 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 Lesser General Public License for more details. You should have
 * received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
package org.jactr.eclipse.runtime.launching.session;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Display;
import org.jactr.core.utils.collections.CachedCollection;
import org.jactr.eclipse.core.CorePlugin;

public class SessionTracker<S extends AbstractSession> {
    static private transient final Log LOGGER = LogFactory.getLog(SessionTracker.class);

    Collection<S> _activeSessions;

    List<Object[]> _queuedSessions;

    CachedCollection<ISessionListener<S>> _listeners;

    public SessionTracker() {
        _listeners = new CachedCollection<ISessionListener<S>>(new ArrayList<ISessionListener<S>>());
        _activeSessions = new ArrayList<S>();
        _queuedSessions = new ArrayList<Object[]>();
    }

    public void addListener(ISessionListener<S> listener) {
        _listeners.add(listener);
    }

    public void removeListener(ISessionListener<S> listener) {
        _listeners.remove(listener);
    }

    public Collection<S> getActiveSessions() {
        return new ArrayList<S>(_activeSessions);
    }

    public boolean hasActiveSessions() {
        return _activeSessions.size() != 0;
    }

    protected void destroy(S session) {
        for (ISessionListener<S> listener : _listeners.getCachedValues())
            try {
                listener.sessionDestroyed(session);
            } catch (Exception e) {
                LOGGER.error("Failed to propogate event ", e);
            }
    }

    protected void add(S session) {
        _activeSessions.add(session);
        // notify
        for (ISessionListener<S> listener : _listeners.getCachedValues())
            try {
                listener.sessionOpened(session);
            } catch (Exception e) {
                LOGGER.error("failed to send event ", e);
            }
    }

    protected void remove(S session, boolean normal) {
        _activeSessions.remove(session);

        // notify
        for (ISessionListener<S> listener : _listeners.getCachedValues())
            try {
                listener.sessionClosed(session, normal);
            } catch (Exception e) {
                LOGGER.error("failed to send event", e);
            }

        if (_queuedSessions.size() != 0 && _activeSessions.size() == 0)
            launchQueued(false);
    }

    protected void cancel(S session) {
        remove(session, false);
    }

    public void addDeferredLaunch(ILaunchConfiguration configuration, String mode) {
        _queuedSessions.add(new Object[] { configuration, mode });
    }

    public int getNumberOfDeferredLaunches() {
        return _queuedSessions.size();
    }

    protected void launchQueued(boolean queryFirst) {

        if (queryFirst) {
            /*
             * prompt the user. should we defer?
             */
            FutureTask<Integer> response = new FutureTask<Integer>(new Callable<Integer>() {
                public Integer call() {
                    String[] buttons = new String[] { "Cancel All", "Run Queued" };
                    MessageDialog prompt = new MessageDialog(Display.getDefault().getActiveShell(), "Runs queued",
                            null, "There are " + _queuedSessions.size() + " runs pending. Cancel them as well?",
                            MessageDialog.QUESTION, buttons, 1);
                    return prompt.open();
                }
            });

            Display.getDefault().syncExec(response);

            try {
                if (response.get() == 0) {
                    _queuedSessions.clear();
                    return;
                }
            } catch (Exception e) {

            }
        }

        Object[] info = _queuedSessions.remove(0);
        ILaunchConfiguration configuration = (ILaunchConfiguration) info[0];
        String mode = (String) info[1];

        try {
            configuration.launch(mode, new NullProgressMonitor());
        } catch (CoreException e) {
            CorePlugin.error("Could not launch deferred execution " + configuration.getName(), e);
        }
    }
}