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/*
* Copyright (C) 2008 The Guava 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 com.google.common.io;
import com.google.common.testing.GcFinalization;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
/**
* Unit tests for {@link FileBackedOutputStream}.
*
* @author Chris Nokleberg
*/
public class FileBackedOutputStreamTest extends IoTestCase {
public void testThreshold() throws Exception {
testThreshold(0, 100, true, false);
testThreshold(10, 100, true, false);
testThreshold(100, 100, true, false);
testThreshold(1000, 100, true, false);
testThreshold(0, 100, false, false);
testThreshold(10, 100, false, false);
testThreshold(100, 100, false, false);
testThreshold(1000, 100, false, false);
}
private void testThreshold(
int fileThreshold, int dataSize, boolean singleByte, boolean resetOnFinalize)
throws IOException {
byte[] data = newPreFilledByteArray(dataSize);
FileBackedOutputStream out = new FileBackedOutputStream(fileThreshold, resetOnFinalize);
ByteSource source = out.asByteSource();
int chunk1 = Math.min(dataSize, fileThreshold);
int chunk2 = dataSize - chunk1;
// Write just enough to not trip the threshold
if (chunk1 > 0) {
write(out, data, 0, chunk1, singleByte);
assertTrue(ByteSource.wrap(data).slice(0, chunk1).contentEquals(source));
}
File file = out.getFile();
assertNull(file);
// Write data to go over the threshold
if (chunk2 > 0) {
write(out, data, chunk1, chunk2, singleByte);
file = out.getFile();
assertEquals(dataSize, file.length());
assertTrue(file.exists());
}
out.close();
// Check that source returns the right data
assertTrue(Arrays.equals(data, source.read()));
// Make sure that reset deleted the file
out.reset();
if (file != null) {
assertFalse(file.exists());
}
}
public void testFinalizeDeletesFile() throws Exception {
byte[] data = newPreFilledByteArray(100);
FileBackedOutputStream out = new FileBackedOutputStream(0, true);
write(out, data, 0, 100, true);
final File file = out.getFile();
assertEquals(100, file.length());
assertTrue(file.exists());
out.close();
// Make sure that finalize deletes the file
out = null;
// times out and throws RuntimeException on failure
GcFinalization.awaitDone(
new GcFinalization.FinalizationPredicate() {
@Override
public boolean isDone() {
return !file.exists();
}
});
}
public void testThreshold_resetOnFinalize() throws Exception {
testThreshold(0, 100, true, true);
testThreshold(10, 100, true, true);
testThreshold(100, 100, true, true);
testThreshold(1000, 100, true, true);
testThreshold(0, 100, false, true);
testThreshold(10, 100, false, true);
testThreshold(100, 100, false, true);
testThreshold(1000, 100, false, true);
}
private static void write(OutputStream out, byte[] b, int off, int len, boolean singleByte)
throws IOException {
if (singleByte) {
for (int i = off; i < off + len; i++) {
out.write(b[i]);
}
} else {
out.write(b, off, len);
}
out.flush(); // for coverage
}
// TODO(chrisn): only works if we ensure we have crossed file threshold
public void testWriteErrorAfterClose() throws Exception {
byte[] data = newPreFilledByteArray(100);
FileBackedOutputStream out = new FileBackedOutputStream(50);
ByteSource source = out.asByteSource();
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.close();
try {
out.write(42);
fail("expected exception");
} catch (IOException expected) {
}
// Verify that write had no effect
assertTrue(Arrays.equals(data, source.read()));
out.reset();
}
public void testReset() throws Exception {
byte[] data = newPreFilledByteArray(100);
FileBackedOutputStream out = new FileBackedOutputStream(Integer.MAX_VALUE);
ByteSource source = out.asByteSource();
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.reset();
assertTrue(Arrays.equals(new byte[0], source.read()));
out.write(data);
assertTrue(Arrays.equals(data, source.read()));
out.close();
}
}
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