Add HttpSessionListener Support

Fixes gh-4

spring-session/src/test/java/org/springframework/session/web/http/SessionEventHttpSessionListenerAdapterTests.java

@@ -0,0 +1,107 @@
+/*
+ * Copyright 2002-2015 the original author or authors.
+ *
+ * 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.springframework.session.web.http;
+
+import static org.fest.assertions.Assertions.assertThat;
+import static org.mockito.Mockito.*;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpSessionEvent;
+import javax.servlet.http.HttpSessionListener;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.session.MapSession;
+import org.springframework.session.Session;
+import org.springframework.session.events.SessionCreatedEvent;
+import org.springframework.session.events.SessionDestroyedEvent;
+
+/**
+ * @author Rob Winch
+ * @since 1.1
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class SessionEventHttpSessionListenerAdapterTests {
+	@Mock
+	HttpSessionListener listener1;
+	@Mock
+	HttpSessionListener listener2;
+	@Mock
+	ServletContext servletContext;
+	@Captor
+	ArgumentCaptor<HttpSessionEvent> sessionEvent;
+
+	SessionDestroyedEvent destroyed;
+	SessionCreatedEvent created;
+	SessionEventHttpSessionListenerAdapter listener;
+
+	@Before
+	public void setup() {
+		this.listener = new SessionEventHttpSessionListenerAdapter(Arrays.asList(listener1, listener2));
+
+		Session session = new MapSession();
+		destroyed = new SessionDestroyedEvent(this, session);
+		created = new SessionCreatedEvent(this, session);
+	}
+
+	// We want relaxed constructor that will allow for an empty listeners to
+	// make configuration easier (i.e. autowire all HttpSessionListeners and might get none)
+	@Test
+	public void constructorEmptyWorks() {
+		new SessionEventHttpSessionListenerAdapter(Collections.<HttpSessionListener>emptyList());
+	}
+
+	/**
+	 * Make sure that we short circuit onApplicationEvent as early as possible if no listeners
+	 */
+	@Test
+	public void onApplicationEventEmptyListenersDoesNotUseEvent() {
+		listener = new SessionEventHttpSessionListenerAdapter(Collections.<HttpSessionListener>emptyList());
+		destroyed = mock(SessionDestroyedEvent.class);
+
+		listener.onApplicationEvent(destroyed);
+
+		verifyZeroInteractions(destroyed, listener1, listener2);
+	}
+
+	@Test
+	public void onApplicationEventDestroyed() {
+		listener.onApplicationEvent(destroyed);
+
+		verify(listener1).sessionDestroyed(sessionEvent.capture());
+		verify(listener2).sessionDestroyed(sessionEvent.capture());
+
+		assertThat(sessionEvent.getValue().getSession().getId()).isEqualTo(destroyed.getSessionId());
+	}
+
+	@Test
+	public void onApplicationEventCreated() {
+		listener.onApplicationEvent(created);
+
+		verify(listener1).sessionCreated(sessionEvent.capture());
+		verify(listener2).sessionCreated(sessionEvent.capture());
+
+		assertThat(sessionEvent.getValue().getSession().getId()).isEqualTo(created.getSessionId());
+	}
+}