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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.index.snapshots.blobstore;
import com.carrotsearch.randomizedtesting.generators.RandomInts;
import org.elasticsearch.test.ESTestCase;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Random;
import static org.hamcrest.Matchers.equalTo;
public class SlicedInputStreamTests extends ESTestCase {
public void testReadRandom() throws IOException {
int parts = randomIntBetween(1, 20);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
int numWriteOps = scaledRandomIntBetween(1000, 10000);
final long seed = randomLong();
Random random = new Random(seed);
for (int i = 0; i < numWriteOps; i++) {
switch(random.nextInt(5)) {
case 1:
stream.write(random.nextInt(Byte.MAX_VALUE));
break;
default:
stream.write(randomBytes(random));
break;
}
}
final CheckClosedInputStream[] streams = new CheckClosedInputStream[parts];
byte[] bytes = stream.toByteArray();
int slice = bytes.length / parts;
int offset = 0;
int length;
for (int i = 0; i < parts; i++) {
length = i == parts-1 ? bytes.length-offset : slice;
streams[i] = new CheckClosedInputStream(new ByteArrayInputStream(bytes, offset, length));
offset += length;
}
SlicedInputStream input = new SlicedInputStream(parts) {
@Override
protected InputStream openSlice(long slice) throws IOException {
return streams[(int)slice];
}
};
random = new Random(seed);
assertThat(input.available(), equalTo(streams[0].available()));
for (int i = 0; i < numWriteOps; i++) {
switch(random.nextInt(5)) {
case 1:
assertThat(random.nextInt(Byte.MAX_VALUE), equalTo(input.read()));
break;
default:
byte[] b = randomBytes(random);
byte[] buffer = new byte[b.length];
int read = readFully(input, buffer);
assertThat(b.length, equalTo(read));
assertArrayEquals(b, buffer);
break;
}
}
assertThat(input.available(), equalTo(0));
for (int i =0; i < streams.length-1; i++) {
assertTrue(streams[i].closed);
}
input.close();
for (int i =0; i < streams.length; i++) {
assertTrue(streams[i].closed);
}
}
private int readFully(InputStream stream, byte[] buffer) throws IOException {
for (int i = 0; i < buffer.length;) {
int read = stream.read(buffer, i, buffer.length-i);
if (read == -1) {
if (i == 0) {
return -1;
} else {
return i;
}
}
i+= read;
}
return buffer.length;
}
private byte[] randomBytes(Random random) {
int length = RandomInts.randomIntBetween(random, 1, 10);
byte[] data = new byte[length];
random.nextBytes(data);
return data;
}
private static final class CheckClosedInputStream extends FilterInputStream {
public boolean closed = false;
public CheckClosedInputStream(InputStream in) {
super(in);
}
@Override
public void close() throws IOException {
closed = true;
super.close();
}
}
}
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