/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 de.unioninvestment.eai.portal.support.vaadin.mvp;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

import org.junit.Before;
import org.junit.Test;

public class EventBusTest {

	class TestEventHandler implements EventHandler {

		private static final long serialVersionUID = 1L;

		boolean eventIsFired = false;

		public boolean isEventIsFired() {
			return eventIsFired;
		}

		private void onHandleTest(TestEvent event) {
			eventIsFired = true;
		}
	}

	class TestEvent implements Event<TestEventHandler> {

		private static final long serialVersionUID = 1L;

		@Override
		public void dispatch(TestEventHandler eventHandler) {
			eventHandler.onHandleTest(this);

		}
	}

	private EventBus eventBus;

	private TestEvent event;

	private TestEventHandler eventHandler;

	@Before
	public void setUp() throws Exception {
		event = new TestEvent();
		eventHandler = new TestEventHandler();

		eventBus = new EventBus();
	}

	@Test
	public void shouldRegisterEventHandler() {
		eventBus.addHandler(TestEvent.class, eventHandler);

		int size = eventBus.getRegisteredHandlerSize(TestEvent.class);

		assertEquals(1, size);
	}

	@Test
	public void shouldRemoveEventHandler() {
		eventBus.addHandler(TestEvent.class, eventHandler);
		eventBus.removeHandler(TestEvent.class, eventHandler);

		int size = eventBus.getRegisteredHandlerSize(Event.class);

		assertEquals(0, size);
	}

	@Test
	public void shouldHandleReceiveEvent() {
		eventBus.addHandler(TestEvent.class, eventHandler);
		eventBus.fireEvent(event);
		assertTrue(eventHandler.isEventIsFired());
	}

	@Test
	public void shouldRemoveAllEventHandlers() {
		eventBus.reset();
		assertThat(eventBus.handler.isEmpty(), is(true));
	}
}