001/*
002 * (C) Copyright 2006-2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.nuxeo.runtime.trackers.concurrent;
017
018import org.nuxeo.runtime.services.event.Event;
019import org.nuxeo.runtime.services.event.EventListener;
020import org.nuxeo.runtime.services.event.EventService;
021
022/**
023 * Wrap a {@link ThreadEventHandler} for being enlisted in the {@link EventService}.
024 *
025 * @since 6.0
026 * @author Stephane Lacoin at Nuxeo (aka matic)
027 */
028public class ThreadEventListener implements EventListener {
029
030    protected final ThreadEventHandler handler;
031
032    protected boolean installed;
033
034    public ThreadEventListener(ThreadEventHandler anHandler) {
035        handler = anHandler;
036    }
037
038    @Override
039    public void handleEvent(Event anEvent) {
040        ((ThreadEvent) anEvent).handle(handler);
041    }
042
043    public boolean isInstalled() {
044        return installed;
045    }
046
047    public boolean uninstall() {
048        if (!installed) {
049            return false;
050        }
051        ThreadEvent.ignore(this);
052        return true;
053    }
054
055    public boolean install() {
056        if (installed) {
057            return false;
058        }
059        ThreadEvent.listen(this);
060        return true;
061    }
062
063}