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1 /*******************************************************************************
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2 * Copyright (c) 2004, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM - Initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwtx.core.runtime.jobs.LockListener;
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14
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15 import tango.core.Thread;
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16 import dwt.dwthelper.utils;
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17
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18 import dwtx.core.internal.jobs.JobManager;
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19 import dwtx.core.internal.jobs.LockManager;
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20 import dwtx.core.runtime.jobs.Job;
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21
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22 /**
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23 * A lock listener is notified whenever a thread is about to wait
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24 * on a lock, and when a thread is about to release a lock.
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25 * <p>
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26 * This class is for internal use by the platform-related plug-ins.
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27 * Clients outside of the base platform should not reference or subclass this class.
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28 * </p>
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29 *
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30 * @see IJobManager#setLockListener(LockListener)
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31 * @since 3.0
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32 */
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33 public class LockListener {
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34 private const LockManager manager;
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35
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36 public this(){
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37 manager = (cast(JobManager)Job.getJobManager()).getLockManager();
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38 }
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39
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40 /**
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41 * Notification that a thread is about to block on an attempt to acquire a lock.
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42 * Returns whether the thread should be granted immediate access to the lock.
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43 * <p>
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44 * This default implementation always returns <code>false</code>.
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45 * Subclasses may override.
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46 *
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47 * @param lockOwner the thread that currently owns the lock this thread is
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48 * waiting for, or <code>null</code> if unknown.
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49 * @return <code>true</code> if the thread should be granted immediate access,
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50 * and <code>false</code> if it should wait for the lock to be available
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51 */
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52 public bool aboutToWait(Thread lockOwner) {
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53 return false;
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54 }
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55
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56 /**
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57 * Notification that a thread is about to release a lock.
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58 * <p>
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59 * This default implementation does nothing. Subclasses may override.
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60 */
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61 public void aboutToRelease() {
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62 //do nothing
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63 }
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64
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65 /**
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66 * Returns whether this thread currently owns any locks
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67 * @return <code>true</code> if this thread owns any locks, and
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68 * <code>false</code> otherwise.
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69 */
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70 protected final bool isLockOwnerThread() {
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71 return manager.isLockOwner();
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72 }
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73 }
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