001/* 002 * (C) Copyright 2006-2014 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 boolean aboutToHandleEvent(Event event) { 040 return true; 041 } 042 043 @Override 044 public void handleEvent(Event anEvent) { 045 ((ThreadEvent) anEvent).handle(handler); 046 } 047 048 public boolean isInstalled() { 049 return installed; 050 } 051 052 public boolean uninstall() { 053 if (!installed) { 054 return false; 055 } 056 ThreadEvent.ignore(this); 057 return true; 058 } 059 060 public boolean install() { 061 if (installed) { 062 return false; 063 } 064 ThreadEvent.listen(this); 065 return true; 066 } 067 068}