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1 | /******************************************************************************* |
2 | * Copyright (c) 2016 EfficiOS Inc., Alexandre Montplaisir | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are | |
5 | * made available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | *******************************************************************************/ | |
9 | ||
10 | package org.eclipse.tracecompass.internal.provisional.tmf.ui.views.timegraph2.swtjfx; | |
11 | ||
12 | import java.lang.ref.WeakReference; | |
13 | ||
14 | import org.eclipse.core.runtime.jobs.Job; | |
15 | import org.eclipse.jdt.annotation.Nullable; | |
16 | ||
17 | public class LatestJobExecutor { | |
18 | ||
19 | /** | |
20 | * The latest job that was schedule in this queue. | |
21 | */ | |
22 | private WeakReference<@Nullable Job> fLatestJob = new WeakReference<>(null); | |
23 | ||
24 | public LatestJobExecutor() { | |
25 | } | |
26 | ||
27 | public synchronized void schedule(Job newJob) { | |
28 | Job latestJob = fLatestJob.get(); | |
29 | if (latestJob != null) { | |
30 | /* | |
31 | * Cancel the existing job. Here's hoping it cooperates and ends | |
32 | * quickly! | |
33 | */ | |
34 | latestJob.cancel(); | |
35 | } | |
36 | ||
37 | /* Start the new job */ | |
38 | fLatestJob = new WeakReference<>(newJob); | |
39 | newJob.schedule(); | |
40 | } | |
41 | ||
42 | } |