/*
 * (C) Copyright 2006-2016 Nuxeo SA (http://nuxeo.com/) and others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.nuxeo.runtime.trackers.concurrent;

import org.nuxeo.runtime.services.event.Event;
import org.nuxeo.runtime.services.event.EventListener;
import org.nuxeo.runtime.services.event.EventService;

/**
 * Wrap a {@link ThreadEventHandler} for being enlisted in the {@link EventService}.
 *
 * @since 6.0
 * @author Stephane Lacoin at Nuxeo (aka matic)
 */
public class ThreadEventListener implements EventListener {

    protected final ThreadEventHandler handler;

    protected boolean installed;

    public ThreadEventListener(ThreadEventHandler anHandler) {
        handler = anHandler;
    }

    @Override
    public void handleEvent(Event anEvent) {
        ((ThreadEvent) anEvent).handle(handler);
    }

    public boolean isInstalled() {
        return installed;
    }

    public boolean uninstall() {
        if (!installed) {
            return false;
        }
        ThreadEvent.ignore(this);
        return true;
    }

    public boolean install() {
        if (installed) {
            return false;
        }
        ThreadEvent.listen(this);
        return true;
    }

}