Mercurial > hg > graal-jvmci-8

comparison 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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4511:6cb549627941 4512:015fb895586b
1 /*
2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24 package com.sun.hotspot.igv.data;
25
26 import java.util.ArrayList;
27 import java.util.List;
28
29 /**
30 *
31 * @author Thomas Wuerthinger
32 */
33 public abstract class Event<L> {
34
35 private List<L> listener;
36 private boolean fireEvents;
37 private boolean eventWasFired;
38
39 public Event() {
40 listener = new ArrayList<>();
41 fireEvents = true;
42 }
43
44 public void addListener(L l) {
45 listener.add(l);
46 }
47
48 public void addListenerAndFire(L l) {
49 addListener(l);
50 fire(l);
51 }
52
53 /**
54 * Remove listener
55 * @param l
56 */
57 public void removeListener(final L l) {
58 listener.remove(l);
59 }
60
61 public void fire() {
62 if(fireEvents) {
63 List<L> tmpList = new ArrayList<>(listener);
64 for (L l : tmpList) {
65 fire(l);
66 }
67 } else {
68 eventWasFired = true;
69 }
70 }
71
72 public void beginAtomic() {
73 assert fireEvents : "endAtomic has to be called before another beginAtomic may be called";
74 this.fireEvents = false;
75 this.eventWasFired = false;
76 }
77
78 public void endAtomic() {
79 assert !fireEvents : "beginAtomic has to be called first";
80 this.fireEvents = true;
81 if(eventWasFired) {
82 fire();
83 }
84 }
85
86 protected abstract void fire(L l);
87 }