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BackpressureIntegrationTest.java
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BackpressureIntegrationTest.java
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/*
* Copyright (c) 2019, Salesforce.com, Inc.
* All rights reserved.
* Licensed under the BSD 3-Clause license.
* For full license text, see LICENSE.txt file in the repo root or https://opensource.org/licenses/BSD-3-Clause
*/
package com.salesforce.rxgrpc;
import com.google.protobuf.Empty;
import com.salesforce.servicelibs.NumberProto;
import com.salesforce.servicelibs.RxNumbersGrpc;
import io.grpc.testing.GrpcServerRule;
import io.reactivex.Flowable;
import io.reactivex.Single;
import io.reactivex.observers.TestObserver;
import io.reactivex.subscribers.TestSubscriber;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.IntStream;
import static org.assertj.core.api.Assertions.assertThat;
@SuppressWarnings("Duplicates")
@Ignore
public class BackpressureIntegrationTest {
@Rule
public GrpcServerRule serverRule = new GrpcServerRule();
@Rule
public UnhandledRxJavaErrorRule errorRule = new UnhandledRxJavaErrorRule().autoVerifyNoError();
private static final int NUMBER_OF_STREAM_ELEMENTS = 512 * 12;
private static AtomicLong lastValueTime;
private static AtomicLong numberOfWaits;
private static class TestService extends RxNumbersGrpc.NumbersImplBase {
@Override
public Single<NumberProto.Number> requestPressure(Flowable<NumberProto.Number> request) {
return request
.map(proto -> proto.getNumber(0))
.doOnNext(i -> System.out.println(" --> " + i))
.doOnNext(i -> waitIfValuesAreEqual(i, 3))
.last(-1)
.map(BackpressureIntegrationTest::protoNum);
}
@Override
public Flowable<NumberProto.Number> responsePressure(Single<Empty> request) {
return Flowable
.fromIterable(IntStream.range(0, NUMBER_OF_STREAM_ELEMENTS)::iterator)
.doOnNext(i -> System.out.println(" <-- " + i))
.doOnNext(i -> updateNumberOfWaits(lastValueTime, numberOfWaits))
.map(BackpressureIntegrationTest::protoNum);
}
@Override
public Flowable<NumberProto.Number> twoWayRequestPressure(Flowable<NumberProto.Number> request) {
return requestPressure(request).toFlowable();
}
@Override
public Flowable<NumberProto.Number> twoWayResponsePressure(Flowable<NumberProto.Number> request) {
request.subscribe();
return responsePressure((Empty) null);
}
}
@Before
public void resetServerStats() {
lastValueTime = new AtomicLong(0);
numberOfWaits = new AtomicLong(0);
}
@Test
public void clientToServerBackpressure() {
serverRule.getServiceRegistry().addService(new TestService());
RxNumbersGrpc.RxNumbersStub stub = RxNumbersGrpc.newRxStub(serverRule.getChannel());
Flowable<NumberProto.Number> rxRequest = Flowable
.fromIterable(IntStream.range(0, NUMBER_OF_STREAM_ELEMENTS)::iterator)
.doOnNext(i -> System.out.println(i + " --> "))
.doOnNext(i -> updateNumberOfWaits(lastValueTime, numberOfWaits))
.map(BackpressureIntegrationTest::protoNum);
TestObserver<NumberProto.Number> rxResponse = rxRequest.as(stub::requestPressure).test();
rxResponse.awaitTerminalEvent(15, TimeUnit.SECONDS);
rxResponse.assertComplete()
.assertValue(v -> v.getNumber(0) == NUMBER_OF_STREAM_ELEMENTS - 1);
assertThat(numberOfWaits.get()).isGreaterThan(0L);
}
@Test
public void serverToClientBackpressure() {
serverRule.getServiceRegistry().addService(new TestService());
RxNumbersGrpc.RxNumbersStub stub = RxNumbersGrpc.newRxStub(serverRule.getChannel());
Single<Empty> rxRequest = Single.just(Empty.getDefaultInstance());
TestSubscriber<NumberProto.Number> rxResponse = rxRequest.as(stub::responsePressure)
.doOnNext(n -> System.out.println(n.getNumber(0) + " <--"))
.doOnNext(n -> waitIfValuesAreEqual(n.getNumber(0), 3))
.test();
rxResponse.awaitTerminalEvent(15, TimeUnit.SECONDS);
rxResponse.assertComplete()
.assertValueCount(NUMBER_OF_STREAM_ELEMENTS);
assertThat(numberOfWaits.get()).isGreaterThan(0L);
}
@Test
public void bidiResponseBackpressure() {
serverRule.getServiceRegistry().addService(new TestService());
RxNumbersGrpc.RxNumbersStub stub = RxNumbersGrpc.newRxStub(serverRule.getChannel());
TestSubscriber<NumberProto.Number> rxResponse = Flowable.<NumberProto.Number>empty()
.compose(stub::twoWayResponsePressure)
.doOnNext(n -> System.out.println(n.getNumber(0) + " <--"))
.doOnNext(n -> waitIfValuesAreEqual(n.getNumber(0), 3))
.test();
rxResponse.awaitTerminalEvent(15, TimeUnit.SECONDS);
rxResponse.assertComplete()
.assertValueCount(NUMBER_OF_STREAM_ELEMENTS);
assertThat(numberOfWaits.get()).isGreaterThan(0L);
}
@Test
public void bidiRequestBackpressure() {
serverRule.getServiceRegistry().addService(new TestService());
RxNumbersGrpc.RxNumbersStub stub = RxNumbersGrpc.newRxStub(serverRule.getChannel());
Flowable<NumberProto.Number> rxRequest = Flowable
.fromIterable(IntStream.range(0, NUMBER_OF_STREAM_ELEMENTS)::iterator)
.doOnNext(i -> System.out.println(i + " --> "))
.doOnNext(i -> updateNumberOfWaits(lastValueTime, numberOfWaits))
.map(BackpressureIntegrationTest::protoNum);
TestSubscriber<NumberProto.Number> rxResponse = rxRequest.compose(stub::twoWayRequestPressure).test();
rxResponse.awaitTerminalEvent(15, TimeUnit.SECONDS);
rxResponse.assertComplete()
.assertValue(v -> v.getNumber(0) == NUMBER_OF_STREAM_ELEMENTS - 1);
assertThat(numberOfWaits.get()).isGreaterThan(0L);
}
private static void updateNumberOfWaits(AtomicLong start, AtomicLong maxTime) {
Long now = System.currentTimeMillis();
Long startValue = start.get();
if (startValue != 0 && now - startValue > 1000) {
maxTime.incrementAndGet();
}
start.set(now);
}
private static void waitIfValuesAreEqual(int value, int other) {
if (value == other) {
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
}
}
}
private static NumberProto.Number protoNum(int i) {
Integer[] ints = new Integer[32 * 1024];
Arrays.setAll(ints, operand -> i);
return NumberProto.Number.newBuilder().addAllNumber(Arrays.asList(ints)).build();
}
}