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Merge pull request #40173 from cescoffier/grpc-concurrent-blocking-call
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Allow concurrent invocation of blocking gRPC services by removing global ordering
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cescoffier authored Apr 24, 2024
2 parents 648de87 + 2a2bb84 commit eddc31b
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package io.quarkus.grpc.server.blocking;

import java.time.Duration;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.acme.Request;
import org.acme.Response;
import org.acme.StandardBlockingGrpcServiceGrpc;
import org.jboss.logging.Logger;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.spec.JavaArchive;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;

import io.grpc.stub.StreamObserver;
import io.quarkus.grpc.GrpcClient;
import io.quarkus.grpc.GrpcService;
import io.quarkus.grpc.runtime.devmode.GrpcServices;
import io.quarkus.test.QuarkusUnitTest;
import io.smallrye.common.annotation.Blocking;
import io.vertx.core.impl.ConcurrentHashSet;

public class MultiThreadedBlockingImplTest {

private static final Logger logger = Logger.getLogger(GrpcServices.class);

@RegisterExtension
static final QuarkusUnitTest config = new QuarkusUnitTest()
.setFlatClassPath(true)
.setArchiveProducer(
() -> ShrinkWrap.create(JavaArchive.class)
.addPackage(StandardBlocking.class.getPackage())
.addPackage(
StandardBlockingGrpcServiceGrpc.StandardBlockingGrpcServiceImplBase.class.getPackage()));

@GrpcClient
StandardBlockingGrpcServiceGrpc.StandardBlockingGrpcServiceBlockingStub client;

static ExecutorService executor = Executors.newCachedThreadPool();

@AfterAll
static void cleanup() {
executor.shutdown();
}

@Test
void testTheBlockingCallsCanBeDispatchedOnMultipleThreads() throws InterruptedException {
int count = 100;
ConcurrentHashSet<String> threads = new ConcurrentHashSet<>();
CountDownLatch latch = new CountDownLatch(count);
for (int i = 0; i < count; i++) {
int id = i;
executor.submit(() -> {
threads.add(invokeService(id));
latch.countDown();
});
}

Assertions.assertTrue(latch.await(10, TimeUnit.SECONDS));
Assertions.assertTrue(threads.size() > 1);
}

String invokeService(int id) {
return client.invoke(Request.newBuilder().setId(id).build()).getThread();
}

@GrpcService
@Blocking
static class StandardBlocking extends StandardBlockingGrpcServiceGrpc.StandardBlockingGrpcServiceImplBase {
@Override
public void invoke(Request request, StreamObserver<Response> responseObserver) {
try {
Thread.sleep(Duration.ofSeconds(2).toMillis());
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new RuntimeException(e);
}
responseObserver.onNext(Response.newBuilder()
.setId(request.getId()).setThread(Thread.currentThread().getName()).build());
responseObserver.onCompleted();
}
}
}
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syntax = "proto3";

option java_multiple_files = true;
option java_package = "org.acme";

package hello;

service StandardBlockingGrpcService {
rpc Invoke (Request) returns (Response) {}
}

message Request {
int32 id = 1;
}

message Response {
int32 id = 1;
string thread = 2;
}
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Expand Up @@ -208,7 +208,7 @@ private void executeBlockingWithRequestContext(Consumer<ServerCall.Listener<ReqT
blockingHandler);
}
this.isConsumingFromIncomingEvents = true;
vertx.executeBlocking(blockingHandler, true).onComplete(p -> {
vertx.executeBlocking(blockingHandler, false).onComplete(p -> {
Consumer<ServerCall.Listener<ReqT>> next = incomingEvents.poll();
if (next != null) {
executeBlockingWithRequestContext(next);
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