Introduce new CacheDataImporter and CacheDataExporter interfaces to import and export data into and out from a GemFire/Geode cache on startup.

These new interfaces and APIs are intended to be used in SBDG's auto-configuration when the Spring Boot app using Apache Geode starts up in order to load or save data.

Resolves gh-67.

spring-geode/src/test/java/org/springframework/geode/data/CacheDataExporterUnitTests.java

@@ -0,0 +1,80 @@
+/*
+ * 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.data;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doCallRealMethod;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import org.junit.Test;
+
+import org.apache.geode.cache.Region;
+
+/**
+ * Unit Tests for {@link CacheDataExporter}
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.apache.geode.cache.Region
+ * @see org.springframework.geode.data.CacheDataExporter
+ * @since 1.3.0
+ */
+public class CacheDataExporterUnitTests {
+
+	@Test
+	public void postProcessBeforeDestructionCallsExportFromGivenARegionArgument() {
+
+		Region<?, ?> mockRegion = mock(Region.class);
+
+		CacheDataExporter exporter = mock(CacheDataExporter.class);
+
+		doCallRealMethod().when(exporter).postProcessBeforeDestruction(any(), anyString());
+
+		exporter.postProcessBeforeDestruction(mockRegion, "TestRegion");
+
+		verify(exporter, times(1)).exportFrom(eq(mockRegion));
+	}
+
+	@Test
+	public void postProcessBeforeDestructionWillNotCallExportFromGivenAnObject() {
+
+		CacheDataExporter exporter = mock(CacheDataExporter.class);
+
+		doCallRealMethod().when(exporter).postProcessBeforeDestruction(any(), anyString());
+
+		exporter.postProcessBeforeDestruction(new Object(), "TestRegion");
+
+		verify(exporter, never()).exportFrom(any(Region.class));
+	}
+
+	@Test
+	public void postProcessBeforeDestructionIsNullSafe() {
+
+		CacheDataExporter exporter = mock(CacheDataExporter.class);
+
+		doCallRealMethod().when(exporter).postProcessBeforeDestruction(any(), anyString());
+
+		exporter.postProcessBeforeDestruction(null, "TestRegion");
+
+		verify(exporter, never()).exportFrom(any(Region.class));
+	}
+}

spring-geode/src/test/java/org/springframework/geode/data/CacheDataImporterUnitTests.java

@@ -0,0 +1,85 @@
+/*
+ * 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.data;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doCallRealMethod;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import org.junit.Test;
+
+import org.apache.geode.cache.Region;
+
+/**
+ * Unit Tests for {@link CacheDataImporter}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.apache.geode.cache.Region
+ * @see org.springframework.geode.data.CacheDataImporter
+ * @since 1.3.0
+ */
+public class CacheDataImporterUnitTests {
+
+	@Test
+	public void postProcessAfterInitializationCallsImportFromGivenARegionArgument() {
+
+		Region<?, ?> mockRegion = mock(Region.class);
+
+		CacheDataImporter importer = mock(CacheDataImporter.class);
+
+		doCallRealMethod().when(importer).postProcessAfterInitialization(any(), anyString());
+		doReturn(mockRegion).when(importer).importInto(eq(mockRegion));
+
+		assertThat(importer.postProcessAfterInitialization(mockRegion, "TestRegion")).isEqualTo(mockRegion);
+
+		verify(importer, times(1)).importInto(eq(mockRegion));
+	}
+
+	@Test
+	public void postProcessAfterInitializationWillNotCallImportFromGivenAnObject() {
+
+		CacheDataImporter importer = mock(CacheDataImporter.class);
+
+		doCallRealMethod().when(importer).postProcessAfterInitialization(any(), anyString());
+
+		Object bean = new Object();
+
+		assertThat(importer.postProcessAfterInitialization(bean, "TestRegion")).isEqualTo(bean);
+
+		verify(importer, never()).importInto(any(Region.class));
+	}
+
+	@Test
+	public void postProcessAfterInitializationIsNullSafe() {
+
+		CacheDataImporter importer = mock(CacheDataImporter.class);
+
+		doCallRealMethod().when(importer).postProcessAfterInitialization(any(), anyString());
+
+		assertThat(importer.postProcessAfterInitialization(null, "TestRegion")).isNull();
+
+		verify(importer, never()).importInto(any(Region.class));
+	}
+}