Add FileResourceWriter implementation to write data to a File-based Resource.
Resolves gh-92.
This commit is contained in:
John Blum
@@ -0,0 +1,328 @@
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/*
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* Copyright 2020 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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package org.springframework.geode.core.io.support;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.mockito.ArgumentMatchers.any;
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import static org.mockito.ArgumentMatchers.anyInt;
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import static org.mockito.ArgumentMatchers.eq;
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import static org.mockito.Mockito.doReturn;
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import static org.mockito.Mockito.doThrow;
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import static org.mockito.Mockito.mock;
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import static org.mockito.Mockito.never;
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import static org.mockito.Mockito.spy;
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import static org.mockito.Mockito.times;
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import static org.mockito.Mockito.verify;
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import static org.mockito.Mockito.verifyNoMoreInteractions;
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import java.io.BufferedOutputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.file.StandardOpenOption;
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import java.util.Optional;
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import org.junit.Test;
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import org.springframework.core.io.Resource;
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import org.springframework.core.io.WritableResource;
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import org.springframework.dao.DataAccessResourceFailureException;
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/**
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* Unit Tests for {@link FileResourceWriter}.
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*
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* @author John Blum
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* @see org.junit.Test
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* @see org.mockito.Mockito
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* @see org.springframework.core.io.Resource
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* @see org.springframework.geode.core.io.support.FileResourceWriter
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* @since 1.3.1
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*/
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public class FileResourceWriterUnitTests {
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@Test
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public void doWriteBytesToResourceOutputStream() throws IOException {
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byte[] data = { (byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE };
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ByteArrayOutputStream out = new ByteArrayOutputStream(data.length);
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FileResourceWriter writer = spy(new FileResourceWriter());
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WritableResource mockResource = mock(WritableResource.class);
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doReturn(true).when(mockResource).isFile();
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doReturn(true).when(mockResource).isWritable();
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doReturn(out).when(mockResource).getOutputStream();
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writer.write(mockResource, data);
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assertThat(out.toByteArray()).isEqualTo(data);
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verify(mockResource, times(1)).isFile();
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verify(mockResource, times(1)).isWritable();
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verify(mockResource, times(1)).getOutputStream();
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verify(writer, times(1)).doWrite(eq(out), eq(data));
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}
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@Test(expected = DataAccessResourceFailureException.class)
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public void doWriteHandlesIOExceptionThrowsDataAccessResourceFailureException() throws IOException {
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byte[] data = { (byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE };
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OutputStream mockOutputStream = mock(OutputStream.class);
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doThrow(new IOException("TEST")).when(mockOutputStream).write(any(byte[].class), anyInt(), anyInt());
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FileResourceWriter writer = spy(new FileResourceWriter());
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doReturn(data.length).when(writer).getBufferSize();
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try {
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writer.doWrite(mockOutputStream, data);
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}
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catch (DataAccessResourceFailureException expected) {
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assertThat(expected)
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.hasMessageStartingWith("Failed to write data (%d byte(s)) to Resource using [%s]",
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data.length, writer.getClass().getName());
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assertThat(expected).hasCauseInstanceOf(IOException.class);
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assertThat(expected.getCause()).hasMessage("TEST");
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assertThat(expected.getCause()).hasNoCause();
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throw expected;
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}
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finally {
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verify(mockOutputStream, times(1)).write(eq(data), eq(0), eq(data.length));
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verify(mockOutputStream, times(1)).flush();
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verify(mockOutputStream, times(1)).close();
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verifyNoMoreInteractions(mockOutputStream);
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}
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}
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@Test
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public void isAbleToHandleFileResource() {
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Resource mockResource = mock(Resource.class);
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doReturn(true).when(mockResource).isFile();
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FileResourceWriter writer = new FileResourceWriter();
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assertThat(writer.getResource().orElse(null)).isNull();
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assertThat(writer.isAbleToHandle(mockResource)).isTrue();
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assertThat(writer.getResource().orElse(null)).isEqualTo(mockResource);
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verify(mockResource, times(1)).isFile();
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verifyNoMoreInteractions(mockResource);
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}
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@Test
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public void isAbleToHandleNonFileResource() {
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Resource mockResource = mock(Resource.class);
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doReturn(false).when(mockResource).isFile();
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FileResourceWriter writer = new FileResourceWriter();
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assertThat(writer.getResource().orElse(null)).isNull();
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assertThat(writer.isAbleToHandle(mockResource)).isFalse();
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assertThat(writer.getResource().orElse(null)).isNull();
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verify(mockResource, times(1)).isFile();
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verifyNoMoreInteractions(mockResource);
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}
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@Test
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public void isAbleToHandleNullResource() {
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FileResourceWriter writer = new FileResourceWriter();
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assertThat(writer.getResource().orElse(null)).isNull();
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assertThat(writer.isAbleToHandle(null)).isFalse();
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assertThat(writer.getResource().orElse(null)).isNull();
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}
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@Test
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public void getBufferSizeEqualsDefault() {
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assertThat(new FileResourceWriter().getBufferSize())
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.isEqualByComparingTo(FileResourceWriter.DEFAULT_BUFFER_SIZE);
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}
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@Test
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public void getOpenOptionsContainsCreateTruncateWrite() {
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assertThat(new FileResourceWriter().getOpenOptions())
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.containsExactly(StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE);
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}
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@Test
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public void decorateWithBufferedOutputStream() throws IOException {
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FileResourceWriter writer = spy(new FileResourceWriter());
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try (OutputStream mockOutputStream = new BufferedOutputStream(mock(OutputStream.class))) {
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assertThat(writer.decorate(mockOutputStream)).isSameAs(mockOutputStream);
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}
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finally {
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verify(writer, never()).newFileOutputStream();
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}
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}
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@Test
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public void decorateWithOutputStream() throws IOException {
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OutputStream mockOutputStream = mock(OutputStream.class);
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FileResourceWriter writer = spy(new FileResourceWriter());
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try (OutputStream out = writer.decorate(mockOutputStream)) {
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assertThat(out).isNotSameAs(mockOutputStream);
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assertThat(out).isInstanceOf(BufferedOutputStream.class);
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}
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finally {
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verify(writer, never()).newFileOutputStream();
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}
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}
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@Test
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public void decorateWithNullCallsNewFileOutputStream() {
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FileResourceWriter writer = spy(new FileResourceWriter());
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OutputStream mockOutputStream = mock(OutputStream.class);
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doReturn(mockOutputStream).when(writer).newFileOutputStream();
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assertThat(writer.decorate(null)).isEqualTo(mockOutputStream);
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verify(writer, times(1)).newFileOutputStream();
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}
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@Test(expected = IllegalStateException.class)
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public void newFileOutputStreamWithNonExistingResourceThrowsIllegalStateException() {
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FileResourceWriter writer = spy(new FileResourceWriter());
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assertThat(writer.getResource().orElse(null)).isNull();
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try {
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writer.newFileOutputStream();
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}
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catch (IllegalStateException expected) {
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assertThat(expected).hasMessage("Resource [null] is not a file based resource");
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assertThat(expected).hasNoCause();
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throw expected;
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}
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finally {
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verify(writer, never()).isAbleToHandle(any());
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}
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}
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@Test(expected = IllegalStateException.class)
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public void newFileOutputStreamWithNonFileResourceThrowsIllegalStateException() {
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Resource mockResource = mock(Resource.class);
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doReturn("MOCK").when(mockResource).getDescription();
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doReturn(false).when(mockResource).isFile();
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FileResourceWriter writer = spy(new FileResourceWriter());
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doReturn(Optional.of(mockResource)).when(writer).getResource();
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try {
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writer.newFileOutputStream();
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}
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catch (IllegalStateException expected) {
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assertThat(expected).hasMessage("Resource [MOCK] is not a file based resource");
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assertThat(expected).hasNoCause();
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throw expected;
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}
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finally {
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verify(writer, times(1)).isAbleToHandle(eq(mockResource));
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verify(writer, never()).getOpenOptions();
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}
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}
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@Test(expected = DataAccessResourceFailureException.class)
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public void newFileOutputStreamHandlesIOExceptionThrowsDataAccessResourceFailureException() throws IOException {
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Resource mockResource = mock(Resource.class);
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doReturn(true).when(mockResource).isFile();
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doReturn("FILE").when(mockResource).getDescription();
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doThrow(new IOException("TEST")).when(mockResource).getFile();
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FileResourceWriter writer = spy(new FileResourceWriter());
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doReturn(Optional.of(mockResource)).when(writer).getResource();
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try {
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writer.newFileOutputStream();
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}
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catch (DataAccessResourceFailureException expected) {
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assertThat(expected).hasMessageStartingWith("Failed to access the Resource [FILE] as a file");
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assertThat(expected).hasCauseInstanceOf(IOException.class);
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assertThat(expected.getCause()).hasMessage("TEST");
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assertThat(expected.getCause()).hasNoCause();
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throw expected;
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}
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finally {
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verify(writer, times(1)).getResource();
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verify(writer, times(1)).isAbleToHandle(eq(mockResource));
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verify(writer, never()).getOpenOptions();
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verify(mockResource, times(1)).isFile();
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verify(mockResource, times(1)).getFile();
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}
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}
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@Test
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public void newFileOutputStreamIsSuccessful() throws IOException {
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File file = new File(System.getProperty("java.io.tmpdir"), "test");
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file.deleteOnExit();
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Resource mockResource = mock(Resource.class);
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doReturn(true).when(mockResource).isFile();
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doReturn(file).when(mockResource).getFile();
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FileResourceWriter writer = spy(new FileResourceWriter());
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doReturn(Optional.of(mockResource)).when(writer).getResource();
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try (OutputStream out = writer.newFileOutputStream()) {
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assertThat(out).isInstanceOf(BufferedOutputStream.class);
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}
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finally {
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verify(writer, times(1)).getResource();
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verify(writer, times(1)).isAbleToHandle(eq(mockResource));
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verify(writer, times(1)).getOpenOptions();
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verify(mockResource, times(1)).isFile();
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verify(mockResource, times(1)).getFile();
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}
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}
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}
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