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added concurrent read invariant test

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Sebastian Stenzel
2016-02-20 17:43:32 +01:00
parent 382c3a0258
commit a5e6c9fb9b
1 changed files with 64 additions and 0 deletions
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64
main/filesystem-invariants-tests/src/test/java/org/cryptomator/filesystem/invariants/FileReadWriteTests.java
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@@ -4,13 +4,23 @@ import static org.cryptomator.filesystem.invariants.matchers.NodeMatchers.hasCon
import static org.hamcrest.CoreMatchers.containsString;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeThat;
import java.nio.ByteBuffer;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.cryptomator.filesystem.File;
import org.cryptomator.filesystem.FileSystem;
import org.cryptomator.filesystem.ReadableFile;
import org.cryptomator.filesystem.WritableFile;
import org.cryptomator.filesystem.invariants.FileSystemFactories.FileSystemFactory;
import org.cryptomator.filesystem.invariants.WaysToObtainAFile.WayToObtainAFile;
@@ -130,4 +140,58 @@ public class FileReadWriteTests {
assertThat(file, hasContent(expectedData));
}
@Theory
public void testConcurrentPartialReadsDontInterfere(FileSystemFactory fileSystemFactory, WayToObtainAFile wayToObtainAnExistingFile) throws InterruptedException, ExecutionException {
assumeThat(wayToObtainAnExistingFile.returnedFilesExist(), is(true));
FileSystem fileSystem = fileSystemFactory.create();
byte[] originalData = new byte[] {32, 44, 1, -3, 4, 66, 4};
byte[] expectedData1 = new byte[] {-3, 4, 66};
byte[] expectedData2 = new byte[] {44, 1, -3, 4};
File file = wayToObtainAnExistingFile.fileWithNameAndContent(fileSystem, FILE_NAME, originalData);
// control flag to make sure thread timing is synchronized correctly
AtomicInteger state = new AtomicInteger();
// set position, then wait before read:
byte[] actualData1 = new byte[3];
Callable<?> readTask1 = () -> {
try (ReadableFile readable = file.openReadable()) {
ByteBuffer buf = ByteBuffer.wrap(actualData1);
readable.position(3);
assertTrue("readTask1 must be the first to set its position", state.compareAndSet(0, 1));
Thread.sleep(20);
assertTrue("readTask1 must be the last to actually read data", state.compareAndSet(3, 4));
readable.read(buf);
return null;
}
};
// wait, then set position and read:
byte[] actualData2 = new byte[4];
Callable<?> readTask2 = () -> {
try (ReadableFile readable = file.openReadable()) {
ByteBuffer buf = ByteBuffer.wrap(actualData2);
Thread.sleep(10);
readable.position(1);
assertTrue("readTask2 must be second to set its position", state.compareAndSet(1, 2));
readable.read(buf);
assertTrue("readTask2 must be first to finish reading", state.compareAndSet(2, 3));
return null;
}
};
// start both read tasks at the same time:
ThreadPoolExecutor executor = new ThreadPoolExecutor(2, 2, 0, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
executor.prestartAllCoreThreads();
Future<?> task1Completed = executor.submit(readTask1);
Future<?> task2Completed = executor.submit(readTask2);
task1Completed.get();
task2Completed.get();
executor.shutdown();
assertArrayEquals(expectedData1, actualData1);
assertArrayEquals(expectedData2, actualData2);
}
}