Add ApplicationContextMembershipListener implementation and extension of MembershipListenerAdapter to adapt the Spring ApplicationContext to handle peer member departed and joined membership events.

spring-geode/src/test/java/org/springframework/geode/distributed/event/ApplicationContextMembershipListenerUnitTests.java

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+/*
+ * Copyright 2020 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
+ *
+ *     https://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.geode.distributed.event;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+
+import org.junit.Test;
+
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.geode.distributed.event.support.MemberDepartedEvent;
+import org.springframework.geode.distributed.event.support.MemberJoinedEvent;
+
+/**
+ * Unit Tests for {@link ApplicationContextMembershipListener}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.springframework.context.ConfigurableApplicationContext
+ * @see org.springframework.geode.distributed.event.ApplicationContextMembershipListener
+ * @see org.springframework.geode.distributed.event.support.MemberDepartedEvent
+ * @see org.springframework.geode.distributed.event.support.MemberJoinedEvent
+ * @since 1.3.0
+ */
+public class ApplicationContextMembershipListenerUnitTests {
+
+	@Test
+	public void constructsApplicationContextMembershipListener() {
+
+		ConfigurableApplicationContext mockApplicationContext = mock(ConfigurableApplicationContext.class);
+
+		ApplicationContextMembershipListener listener =
+			new ApplicationContextMembershipListener(mockApplicationContext);
+
+		assertThat(listener).isNotNull();
+		assertThat(listener.getApplicationContext()).isEqualTo(mockApplicationContext);
+
+		verifyNoInteractions(mockApplicationContext);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void constructsApplicationContextMembershipListenerWithNullThrowsIllegalArgumentException() {
+
+		try {
+			new ApplicationContextMembershipListener(null);
+		}
+		catch (IllegalArgumentException expected) {
+
+			assertThat(expected).hasMessage("ConfigurableApplicationContext must not be null");
+			assertThat(expected).hasNoCause();
+
+			throw expected;
+		}
+	}
+
+	@Test
+	public void handleMemberDepartedCallsApplicationContextClose() {
+
+		ConfigurableApplicationContext mockApplicationContext = mock(ConfigurableApplicationContext.class);
+
+		MemberDepartedEvent mockEvent = mock(MemberDepartedEvent.class);
+
+		ApplicationContextMembershipListener listener =
+			spy(new ApplicationContextMembershipListener(mockApplicationContext));
+
+		listener.handleMemberDeparted(mockEvent);
+
+		verify(mockApplicationContext, times(1)).close();
+		verifyNoMoreInteractions(mockApplicationContext);
+	}
+
+	@Test
+	public void handleMemberJoinedCallApplicationContextRefresh() {
+
+		ConfigurableApplicationContext mockApplicationContext = mock(ConfigurableApplicationContext.class);
+
+		MemberJoinedEvent mockEvent = mock(MemberJoinedEvent.class);
+
+		ApplicationContextMembershipListener listener =
+			spy(new ApplicationContextMembershipListener(mockApplicationContext));
+
+		listener.handleMemberJoined(mockEvent);
+
+		verify(mockApplicationContext, times(1)).refresh();
+		verifyNoMoreInteractions(mockApplicationContext);
+	}
+}