/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.scanner.events;
import org.sonar.api.batch.events.EventHandler;
import java.util.ArrayList;
import java.util.List;
/**
* Dispatches {@link BatchEvent}s. Eases decoupling by allowing objects to interact without having direct dependencies upon one another, and
* without requiring event sources to deal with maintaining handler lists.
*/
public class EventBus {
private EventHandler[] registeredHandlers;
public EventBus(EventHandler[] handlers) {
this.registeredHandlers = handlers;
}
/**
* Fires the given event.
*/
public void fireEvent(BatchEvent event) {
doFireEvent(event);
}
private void doFireEvent(BatchEvent event) {
List<EventHandler> handlers = getDispatchList(event.getType());
for (EventHandler handler : handlers) {
event.dispatch(handler);
}
}
private List<EventHandler> getDispatchList(Class<? extends EventHandler> handlerType) {
List<EventHandler> result = new ArrayList<>(registeredHandlers.length);
for (EventHandler handler : registeredHandlers) {
if (handlerType.isAssignableFrom(handler.getClass())) {
result.add(handler);
}
}
return result;
}
}