Define ResourceWriter interface for writing data to a resource identified by a Resource handle.

Resolves gh-92.

spring-geode/src/test/java/org/springframework/geode/core/io/ResourceWriterUnitTests.java

@@ -0,0 +1,134 @@
+/*
+ * 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.core.io;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.doCallRealMethod;
+import static org.mockito.Mockito.doThrow;
+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 static org.mockito.Mockito.verifyNoInteractions;
+
+import java.nio.ByteBuffer;
+
+import org.junit.Test;
+
+import org.springframework.core.io.Resource;
+
+/**
+ * Unit Tests for {@link ResourceWriter}.
+ *
+ * @author John Blum
+ * @see org.junit.Test
+ * @see org.mockito.Mockito
+ * @see org.springframework.core.io.Resource
+ * @see org.springframework.geode.core.io.ResourceWriter
+ * @since 1.3.1
+ */
+public class ResourceWriterUnitTests {
+
+	@Test
+	public void writeWithByteBufferCallsWriteWithByteArray() {
+
+		byte[] data = { (byte) 0x1 };
+
+		Resource mockResource = mock(Resource.class);
+
+		ResourceWriter writer = mock(ResourceWriter.class);
+
+		doCallRealMethod().when(writer).write(any(), any(ByteBuffer.class));
+
+		writer.write(mockResource, ByteBuffer.wrap(data));
+
+		verify(writer, times(1)).write(eq(mockResource), eq(data));
+	}
+
+	@Test
+	public void thenWriteToNullReturnsThis() {
+
+		ResourceWriter mockResourceWriter = mock(ResourceWriter.class);
+
+		doCallRealMethod().when(mockResourceWriter).thenWriteTo(any());
+
+		assertThat(mockResourceWriter.thenWriteTo(null)).isEqualTo(mockResourceWriter);
+	}
+
+	@Test
+	public void thenWriteToResourceWriterReturnsComposite() {
+
+		ResourceWriter thisMockResourceWriter = mock(ResourceWriter.class, "this");
+		ResourceWriter thatMockResourceWriter = mock(ResourceWriter.class, "that");
+
+		doCallRealMethod().when(thisMockResourceWriter).thenWriteTo(any());
+
+		ResourceWriter composite = thisMockResourceWriter.thenWriteTo(thatMockResourceWriter);
+
+		assertThat(composite).isNotNull();
+		assertThat(composite).isNotEqualTo(thisMockResourceWriter);
+		assertThat(composite).isNotEqualTo(thatMockResourceWriter);
+	}
+
+	@Test
+	public void thenWriteToResourceWriterWritesToThis() {
+
+		byte[] array = { (byte) 0xCA, (byte) 0xFE };
+
+		Resource mockResource = mock(Resource.class);
+
+		ResourceWriter thisMockResourceWriter = mock(ResourceWriter.class, "this");
+		ResourceWriter thatMockResourceWriter = mock(ResourceWriter.class, "that");
+
+		doCallRealMethod().when(thisMockResourceWriter).thenWriteTo(any());
+
+		ResourceWriter composite = thisMockResourceWriter.thenWriteTo(thatMockResourceWriter);
+
+		assertThat(composite).isNotNull();
+
+		composite.write(mockResource, array);
+
+		verify(thisMockResourceWriter, times(1)).write(eq(mockResource), eq(array));
+		verify(thatMockResourceWriter, never()).write(any(), any(byte[].class));
+		verifyNoInteractions(mockResource);
+	}
+
+	@Test
+	public void thenWriteToResourceWriterWritesToThat() {
+
+		byte[] array = { (byte) 0xBA, (byte) 0xBE };
+
+		Resource mockResource = mock(Resource.class);
+
+		ResourceWriter thisMockResourceWriter = mock(ResourceWriter.class, "this");
+		ResourceWriter thatMockResourceWriter = mock(ResourceWriter.class, "that");
+
+		doCallRealMethod().when(thisMockResourceWriter).thenWriteTo(any());
+		doThrow(new UnhandledResourceException("TEST")).when(thisMockResourceWriter).write(eq(mockResource), eq(array));
+
+		ResourceWriter composite = thisMockResourceWriter.thenWriteTo(thatMockResourceWriter);
+
+		assertThat(composite).isNotNull();
+
+		composite.write(mockResource, array);
+
+		verify(thisMockResourceWriter, times(1)).write(eq(mockResource), eq(array));
+		verify(thatMockResourceWriter, times(1)).write(any(), any(byte[].class));
+		verifyNoInteractions(mockResource);
+	}
+}