Mercurial > hg > graal-jvmci-8
diff visualizer/Data/src/com/sun/hotspot/igv/data/Event.java @ 4512:015fb895586b
Moved visualizer to new directory.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 07 Feb 2012 22:41:09 +0100 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/visualizer/Data/src/com/sun/hotspot/igv/data/Event.java Tue Feb 07 22:41:09 2012 +0100 @@ -0,0 +1,87 @@ +/* + * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code 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 General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ +package com.sun.hotspot.igv.data; + +import java.util.ArrayList; +import java.util.List; + +/** + * + * @author Thomas Wuerthinger + */ +public abstract class Event<L> { + + private List<L> listener; + private boolean fireEvents; + private boolean eventWasFired; + + public Event() { + listener = new ArrayList<>(); + fireEvents = true; + } + + public void addListener(L l) { + listener.add(l); + } + + public void addListenerAndFire(L l) { + addListener(l); + fire(l); + } + + /** + * Remove listener + * @param l + */ + public void removeListener(final L l) { + listener.remove(l); + } + + public void fire() { + if(fireEvents) { + List<L> tmpList = new ArrayList<>(listener); + for (L l : tmpList) { + fire(l); + } + } else { + eventWasFired = true; + } + } + + public void beginAtomic() { + assert fireEvents : "endAtomic has to be called before another beginAtomic may be called"; + this.fireEvents = false; + this.eventWasFired = false; + } + + public void endAtomic() { + assert !fireEvents : "beginAtomic has to be called first"; + this.fireEvents = true; + if(eventWasFired) { + fire(); + } + } + + protected abstract void fire(L l); +}