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TimedBufferTest.java
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TimedBufferTest.java
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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.activemq.artemis.tests.unit.core.journal.impl;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import io.netty.buffer.ByteBuf;
import org.apache.activemq.artemis.api.core.ActiveMQBuffer;
import org.apache.activemq.artemis.api.core.ActiveMQBuffers;
import org.apache.activemq.artemis.core.io.DummyCallback;
import org.apache.activemq.artemis.core.io.IOCallback;
import org.apache.activemq.artemis.core.io.buffer.TimedBuffer;
import org.apache.activemq.artemis.core.io.buffer.TimedBufferObserver;
import org.apache.activemq.artemis.core.journal.EncodingSupport;
import org.apache.activemq.artemis.tests.util.ActiveMQTestBase;
import org.apache.activemq.artemis.utils.Env;
import org.apache.activemq.artemis.utils.ReusableLatch;
import org.apache.activemq.artemis.utils.Wait;
import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.invoke.MethodHandles;
public class TimedBufferTest extends ActiveMQTestBase {
private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private static final int ONE_SECOND_IN_NANOS = 1000000000; // in nanoseconds
IOCallback dummyCallback = new IOCallback() {
@Override
public void done() {
}
@Override
public void onError(final int errorCode, final String errorMessage) {
}
};
@Test
public void testFillBuffer() {
final ArrayList<ByteBuffer> buffers = new ArrayList<>();
final AtomicInteger flushTimes = new AtomicInteger(0);
class TestObserver implements TimedBufferObserver {
@Override
public void flushBuffer(final ByteBuf byteBuf, final boolean sync, final List<IOCallback> callbacks) {
final ByteBuffer buffer = ByteBuffer.allocate(byteBuf.readableBytes());
buffer.limit(byteBuf.readableBytes());
byteBuf.getBytes(byteBuf.readerIndex(), buffer);
buffer.flip();
buffers.add(buffer);
flushTimes.incrementAndGet();
}
@Override
public int getRemainingBytes() {
return 1024 * 1024;
}
}
TimedBuffer timedBuffer = new TimedBuffer(null, 100, TimedBufferTest.ONE_SECOND_IN_NANOS, false);
timedBuffer.start();
try {
timedBuffer.setObserver(new TestObserver());
int x = 0;
for (int i = 0; i < 10; i++) {
byte[] bytes = new byte[10];
for (int j = 0; j < 10; j++) {
bytes[j] = ActiveMQTestBase.getSamplebyte(x++);
}
ActiveMQBuffer buff = ActiveMQBuffers.wrappedBuffer(bytes);
timedBuffer.checkSize(10);
timedBuffer.addBytes(buff, false, dummyCallback);
}
timedBuffer.checkSize(1);
Assert.assertEquals(1, flushTimes.get());
ByteBuffer flushedBuffer = buffers.get(0);
Assert.assertEquals(100, flushedBuffer.limit());
Assert.assertEquals(100, flushedBuffer.capacity());
flushedBuffer.rewind();
for (int i = 0; i < 100; i++) {
Assert.assertEquals(ActiveMQTestBase.getSamplebyte(i), flushedBuffer.get());
}
} finally {
timedBuffer.stop();
}
}
@Test
public void testTimeOnTimedBuffer() throws Exception {
final ReusableLatch latchFlushed = new ReusableLatch(0);
final AtomicInteger flushes = new AtomicInteger(0);
class TestObserver implements TimedBufferObserver {
@Override
public void flushBuffer(final ByteBuf byteBuf, final boolean sync, final List<IOCallback> callbacks) {
final ByteBuffer buffer = ByteBuffer.allocate(byteBuf.readableBytes());
buffer.limit(byteBuf.readableBytes());
byteBuf.getBytes(byteBuf.readerIndex(), buffer);
for (IOCallback callback : callbacks) {
callback.done();
}
}
@Override
public int getRemainingBytes() {
return 1024 * 1024;
}
}
TimedBuffer timedBuffer = new TimedBuffer(null, 100, TimedBufferTest.ONE_SECOND_IN_NANOS / 2, false);
timedBuffer.start();
TestObserver observer = new TestObserver();
timedBuffer.setObserver(observer);
int x = 0;
byte[] bytes = new byte[10];
for (int j = 0; j < 10; j++) {
bytes[j] = ActiveMQTestBase.getSamplebyte(x++);
}
ActiveMQBuffer buff = ActiveMQBuffers.wrappedBuffer(bytes);
IOCallback callback = new IOCallback() {
@Override
public void done() {
logger.debug("done");
latchFlushed.countDown();
}
@Override
public void onError(int errorCode, String errorMessage) {
}
};
try {
latchFlushed.setCount(2);
// simulating a low load period
timedBuffer.addBytes(buff, true, callback);
Thread.sleep(100);
timedBuffer.addBytes(buff, true, callback);
Assert.assertTrue(latchFlushed.await(5, TimeUnit.SECONDS));
latchFlushed.setCount(5);
flushes.set(0);
// Sending like crazy... still some wait (1 millisecond) between each send..
long time = System.currentTimeMillis();
for (int i = 0; i < 5; i++) {
timedBuffer.addBytes(buff, true, callback);
Thread.sleep(1);
}
Assert.assertTrue(latchFlushed.await(5, TimeUnit.SECONDS));
// The purpose of the timed buffer is to batch writes up to a millisecond.. or up to the size of the buffer.
Assert.assertTrue("Timed Buffer is not batching accordingly, it was expected to take at least 500 seconds batching multiple writes while it took " + (System.currentTimeMillis() - time) + " milliseconds", System.currentTimeMillis() - time >= 450);
// ^^ there are some discounts that can happen inside the timed buffer that are still considered valid (like discounting the time it took to perform the operation itself
// for that reason the test has been failing (before this commit) at 499 or 480 milliseconds. So, I'm using a reasonable number close to 500 milliseconds that would still be valid for the test
// it should be in fact only writing once..
// i will set for 3 just in case there's a GC or anything else happening on the test
Assert.assertTrue("Too many writes were called", flushes.get() <= 3);
} finally {
timedBuffer.stop();
}
}
private static void spinSleep(long timeout) {
if (timeout > 0) {
final long deadline = System.nanoTime() + timeout;
while (System.nanoTime() - deadline < 0) {
//spin wait
}
}
}
private static final class NonBlockingObserver implements TimedBufferObserver, AutoCloseable {
private long flushes = 0;
private final ByteBuffer dummyBuffer;
private final Thread asyncIOWriter;
private final AtomicLong flushRequest = new AtomicLong(0);
private final AtomicLong flushesDone = new AtomicLong(0);
private NonBlockingObserver(int bufferSize, long deviceTime) {
this.asyncIOWriter = new Thread(() -> {
long flushes = 0;
while (!Thread.interrupted()) {
if (flushRequest.get() > flushes) {
final long flushesToBePerformed = flushRequest.get() - flushes;
//during the flush time no new flush request can be taken!
for (int i = 0; i < flushesToBePerformed; i++) {
spinSleep(deviceTime);
flushes++;
//make progress to let others being notified
flushesDone.lazySet(flushes);
}
}
}
});
dummyBuffer = ByteBuffer.allocate(bufferSize);
asyncIOWriter.start();
}
@Override
public void flushBuffer(final ByteBuf byteBuf, final boolean sync, final List<IOCallback> callbacks) {
assert sync;
dummyBuffer.limit(byteBuf.readableBytes());
byteBuf.getBytes(byteBuf.readerIndex(), dummyBuffer);
if (dummyBuffer.position() > 0) {
dummyBuffer.clear();
flushes++;
//ask the device to perform a flush
flushRequest.lazySet(flushes);
}
}
@Override
public int getRemainingBytes() {
return Integer.MAX_VALUE;
}
@Override
public void close() {
asyncIOWriter.interrupt();
}
public void waitUntilFlushIsDone(long flush) {
//spin wait to be more reactive
while (flushesDone.get() < flush) {
}
}
public long flushesDone() {
return flushesDone.get();
}
}
private static final class BlockingObserver implements TimedBufferObserver, AutoCloseable {
private long flushes = 0;
private final ByteBuffer dummyBuffer;
private final long deviceTime;
private final AtomicLong flushesDone = new AtomicLong(0);
private BlockingObserver(int bufferSize, long deviceTime) {
this.dummyBuffer = ByteBuffer.allocate(bufferSize);
this.deviceTime = deviceTime;
}
@Override
public void flushBuffer(final ByteBuf byteBuf, final boolean sync, final List<IOCallback> callbacks) {
assert sync;
dummyBuffer.limit(byteBuf.readableBytes());
byteBuf.getBytes(byteBuf.readerIndex(), dummyBuffer);
if (dummyBuffer.position() > 0) {
dummyBuffer.clear();
//emulate the flush time of a blocking device with a precise sleep
spinSleep(deviceTime);
flushes++;
//publish the number of flushes happened
flushesDone.lazySet(flushes);
}
}
@Override
public int getRemainingBytes() {
return Integer.MAX_VALUE;
}
@Override
public void close() {
//no op
}
public void waitUntilFlushIsDone(long flush) {
//spin wait to be more reactive
while (flushesDone.get() < flush) {
}
}
public long flushesDone() {
return flushesDone.get();
}
}
private static final EncodingSupport LONG_ENCODER = new EncodingSupport() {
@Override
public int getEncodeSize() {
return Long.BYTES;
}
@Override
public void encode(ActiveMQBuffer buffer) {
buffer.writeLong(1L);
}
@Override
public void decode(ActiveMQBuffer buffer) {
}
};
/**
* This test is showing the behaviour of the TimedBuffer with a blocking API (NIO/MAPPED) and
* how the timeout value is not == 1/IOPS like the ASYNCIO case
*/
@Test
public void timeoutShouldMatchFlushIOPSWithNotBlockingFlush() {
//use a large timeout in order to be reactive
final long timeout = TimeUnit.MILLISECONDS.toNanos(100);
assert ((int) timeout) > 0;
//it is optimistic: the timeout and the blockingDeviceFlushTime are a perfect match
final long deviceTime = timeout;
final int bufferSize = Env.osPageSize();
final TimedBuffer timedBuffer = new TimedBuffer(null, bufferSize, (int) timeout, false);
timedBuffer.start();
try (NonBlockingObserver observer = new NonBlockingObserver(bufferSize, deviceTime)) {
timedBuffer.setObserver(observer);
//do not call checkSize because we already know that will succeed
timedBuffer.addBytes(LONG_ENCODER, true, DummyCallback.getInstance());
//wait the first flush to happen
observer.waitUntilFlushIsDone(1);
//for a not-blocking flush I'm expecting the TimedBuffer has near to finished sleeping now
assert observer.flushesDone() == 1;
//issue a new write
timedBuffer.addBytes(LONG_ENCODER, true, DummyCallback.getInstance());
//the countdown on the TimedBuffer is already started even before this addBytes
final long endOfWriteRequest = System.nanoTime();
//wait until it will succeed
observer.waitUntilFlushIsDone(2);
final long flushDone = System.nanoTime();
final long elapsedTime = flushDone - endOfWriteRequest;
assert observer.flushesDone() == 2;
//it is much more than what is expected!!if it will fail it means that the timed IOPS = 1/(timeout + blockingDeviceFlushTime)!!!!!!
//while it has to be IOPS = 1/timeout
logger.debug("elapsed time: {} with timeout: {}", elapsedTime, timeout);
final long maxExpected = timeout + deviceTime;
Assert.assertTrue("elapsed = " + elapsedTime + " max expected = " + maxExpected, elapsedTime <= maxExpected);
} finally {
timedBuffer.stop();
}
}
/**
* This test is showing the behaviour of the TimedBuffer with a blocking API (NIO/MAPPED) and
* how the timeout value is not == 1/IOPS like the ASYNCIO case
*/
@Test
public void timeoutShouldMatchFlushIOPSWithBlockingFlush() {
//use a large timeout in order to be reactive
final long timeout = TimeUnit.MILLISECONDS.toNanos(100);
assert ((int) timeout) > 0;
//it is optimistic: the timeout and the blockingDeviceFlushTime are a perfect match
final long deviceTime = timeout;
final int bufferSize = Env.osPageSize();
final TimedBuffer timedBuffer = new TimedBuffer(null, bufferSize, (int) timeout, false);
timedBuffer.start();
try (BlockingObserver observer = new BlockingObserver(bufferSize, deviceTime)) {
timedBuffer.setObserver(observer);
//do not call checkSize because we already know that will succeed
timedBuffer.addBytes(LONG_ENCODER, true, DummyCallback.getInstance());
//wait the first flush to happen
observer.waitUntilFlushIsDone(1);
//for a blocking flush I'm expecting the TimedBuffer has started sleeping now
assert observer.flushesDone() == 1;
//issue a new write
timedBuffer.addBytes(LONG_ENCODER, true, DummyCallback.getInstance());
//the countdown on the TimedBuffer is already started even before this addBytes
final long endOfWriteRequest = System.nanoTime();
//wait until it will succeed
observer.waitUntilFlushIsDone(2);
final long flushDone = System.nanoTime();
final long elapsedTime = flushDone - endOfWriteRequest;
assert observer.flushesDone() == 2;
//it is much more than what is expected!!if it will fail it means that the timed IOPS = 1/(timeout + blockingDeviceFlushTime)!!!!!!
//while it has to be IOPS = 1/timeout
logger.debug("elapsed time: {} with timeout: {}", elapsedTime, timeout);
final long maxExpected = timeout + deviceTime;
Assert.assertTrue("elapsed = " + elapsedTime + " max expected = " + maxExpected, elapsedTime <= maxExpected);
} finally {
timedBuffer.stop();
}
}
@Test
public void testTimingAndFlush() throws Exception {
final ArrayList<ByteBuffer> buffers = new ArrayList<>();
final AtomicInteger flushTimes = new AtomicInteger(0);
class TestObserver implements TimedBufferObserver {
@Override
public void flushBuffer(final ByteBuf byteBuf, final boolean sync, final List<IOCallback> callbacks) {
final ByteBuffer buffer = ByteBuffer.allocate(byteBuf.readableBytes());
buffer.limit(byteBuf.readableBytes());
byteBuf.getBytes(byteBuf.readerIndex(), buffer);
buffer.flip();
buffers.add(buffer);
flushTimes.incrementAndGet();
}
@Override
public int getRemainingBytes() {
return 1024 * 1024;
}
}
TimedBuffer timedBuffer = new TimedBuffer(null, 100, TimedBufferTest.ONE_SECOND_IN_NANOS / 10, false);
timedBuffer.start();
try {
timedBuffer.setObserver(new TestObserver());
int x = 0;
byte[] bytes;
ActiveMQBuffer buff;
for (int i = 0; i < 3; i++) {
bytes = new byte[10];
for (int j = 0; j < 10; j++) {
bytes[j] = ActiveMQTestBase.getSamplebyte(x++);
}
buff = ActiveMQBuffers.wrappedBuffer(bytes);
timedBuffer.checkSize(10);
timedBuffer.addBytes(buff, false, dummyCallback);
}
Thread.sleep(200);
int count = flushTimes.get();
Assert.assertTrue(count < 3);
bytes = new byte[10];
for (int j = 0; j < 10; j++) {
bytes[j] = ActiveMQTestBase.getSamplebyte(x++);
}
buff = ActiveMQBuffers.wrappedBuffer(bytes);
timedBuffer.checkSize(10);
timedBuffer.addBytes(buff, false, dummyCallback);
Wait.assertEquals(count + 1, () -> flushTimes.get(), 2000);
bytes = new byte[10];
for (int j = 0; j < 10; j++) {
bytes[j] = ActiveMQTestBase.getSamplebyte(x++);
}
buff = ActiveMQBuffers.wrappedBuffer(bytes);
timedBuffer.checkSize(10);
timedBuffer.addBytes(buff, true, dummyCallback);
Thread.sleep(500);
Assert.assertEquals(count + 2, flushTimes.get());
ByteBuffer flushedBuffer = buffers.get(0);
Assert.assertEquals(30, flushedBuffer.limit());
Assert.assertEquals(30, flushedBuffer.capacity());
flushedBuffer.rewind();
for (int i = 0; i < 30; i++) {
Assert.assertEquals(ActiveMQTestBase.getSamplebyte(i), flushedBuffer.get());
}
} finally {
timedBuffer.stop();
}
}
}