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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.io;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.fail;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.function.Supplier;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
/**
* See Jira ticket IO-802.
*/
public class IOUtilsMultithreadedSkipTest {
private static final String FIXTURE = "TIKA-4065.bin";
long seed = 1;
private final ThreadLocal<byte[]> threadLocal = ThreadLocal.withInitial(() -> new byte[4096]);
private int[] generateExpected(final InputStream is, final int[] skips) throws IOException {
final int[] testBytes = new int[skips.length];
for (int i = 0; i < skips.length; i++) {
try {
IOUtils.skipFully(is, skips[i]);
testBytes[i] = is.read();
} catch (final EOFException e) {
testBytes[i] = -1;
}
}
return testBytes;
}
private int[] generateSkips(final byte[] bytes, final int numSkips, final Random random) {
final int[] skips = new int[numSkips];
for (int i = 0; i < skips.length; i++) {
skips[i] = random.nextInt(bytes.length / numSkips) + bytes.length / 10;
}
return skips;
}
private InputStream inflate(final byte[] deflated) throws IOException {
final ByteArrayOutputStream bos = new ByteArrayOutputStream();
IOUtils.copy(new InflaterInputStream(new ByteArrayInputStream(deflated), new Inflater(true)), bos);
return new ByteArrayInputStream(bos.toByteArray());
}
@BeforeEach
public void setUp() {
// Not the best random we can use but good enough here.
seed = new Random().nextLong();
}
private void testSkipFullyOnInflaterInputStream(final Supplier<byte[]> baSupplier) throws Exception {
final long thisSeed = seed;
// thisSeed = -727624427837034313l;
final Random random = new Random(thisSeed);
final byte[] bytes;
try (final InputStream inputStream = getClass().getResourceAsStream(FIXTURE)) {
bytes = IOUtils.toByteArray(inputStream);
}
final int numSkips = random.nextInt(bytes.length) / 100 + 1;
final int[] skips = generateSkips(bytes, numSkips, random);
final int[] expected;
try (final InputStream inflate = inflate(bytes)) {
expected = generateExpected(inflate, skips);
}
final int numThreads = 2;
final int iterations = 100;
final ExecutorService executorService = Executors.newFixedThreadPool(numThreads);
final ExecutorCompletionService<Integer> executorCompletionService = new ExecutorCompletionService<>(executorService);
for (int i = 0; i < numThreads; i++) {
executorCompletionService.submit(() -> {
for (int iteration = 0; iteration < iterations; iteration++) {
try (InputStream is = new InflaterInputStream(new ByteArrayInputStream(bytes), new Inflater(true))) {
for (int skipIndex = 0; skipIndex < skips.length; skipIndex++) {
try {
IOUtils.skipFully(is, skips[skipIndex], baSupplier);
final int c = is.read();
assertEquals(expected[skipIndex], c, "failed on seed=" + seed + " iteration=" + iteration);
} catch (final EOFException e) {
assertEquals(expected[skipIndex], is.read(), "failed on " + "seed=" + seed + " iteration=" + iteration);
}
}
}
}
return 1;
});
}
int finished = 0;
while (finished < numThreads) {
// blocking
final Future<Integer> future = executorCompletionService.take();
try {
future.get();
} catch (final Exception e) {
// printStackTrace() for simpler debugging
e.printStackTrace();
fail("failed on seed=" + seed);
}
finished++;
}
}
@Test
public void testSkipFullyOnInflaterInputStream_New_bytes() throws Exception {
testSkipFullyOnInflaterInputStream(() -> new byte[4096]);
}
@Test
public void testSkipFullyOnInflaterInputStream_ThreadLocal() throws Exception {
testSkipFullyOnInflaterInputStream(threadLocal::get);
}
}
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