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annotate visualizer/Data/src/com/sun/hotspot/igv/data/Event.java @ 4512:015fb895586b

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Moved visualizer to new directory.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 07 Feb 2012 22:41:09 +0100
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4512
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1 /*
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2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24 package com.sun.hotspot.igv.data;
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25
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26 import java.util.ArrayList;
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27 import java.util.List;
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28
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29 /**
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30 *
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31 * @author Thomas Wuerthinger
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32 */
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33 public abstract class Event<L> {
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34
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35 private List<L> listener;
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36 private boolean fireEvents;
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37 private boolean eventWasFired;
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38
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39 public Event() {
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40 listener = new ArrayList<>();
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41 fireEvents = true;
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42 }
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43
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44 public void addListener(L l) {
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45 listener.add(l);
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46 }
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47
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48 public void addListenerAndFire(L l) {
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49 addListener(l);
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50 fire(l);
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51 }
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52
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53 /**
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54 * Remove listener
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55 * @param l
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56 */
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57 public void removeListener(final L l) {
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58 listener.remove(l);
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59 }
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60
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61 public void fire() {
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62 if(fireEvents) {
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63 List<L> tmpList = new ArrayList<>(listener);
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64 for (L l : tmpList) {
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65 fire(l);
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66 }
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67 } else {
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68 eventWasFired = true;
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69 }
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70 }
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71
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72 public void beginAtomic() {
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73 assert fireEvents : "endAtomic has to be called before another beginAtomic may be called";
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74 this.fireEvents = false;
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75 this.eventWasFired = false;
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76 }
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77
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78 public void endAtomic() {
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79 assert !fireEvents : "beginAtomic has to be called first";
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80 this.fireEvents = true;
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81 if(eventWasFired) {
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82 fire();
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83 }
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84 }
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85
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86 protected abstract void fire(L l);
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87 }