content: /*
   * 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.camel.component.grpc;
  
  import java.util.List;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.googlecode.junittoolbox.MultithreadingTester;
  import com.googlecode.junittoolbox.RunnableAssert;
  import io.grpc.ManagedChannel;
  import io.grpc.netty.NettyChannelBuilder;
  import io.grpc.stub.StreamObserver;
  import org.apache.camel.Exchange;
  import org.apache.camel.Processor;
  import org.apache.camel.builder.RouteBuilder;
  import org.apache.camel.test.AvailablePortFinder;
  import org.apache.camel.test.junit5.CamelTestSupport;
  import org.junit.jupiter.api.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class GrpcConsumerConcurrentTest extends CamelTestSupport {
      private static final Logger LOG = LoggerFactory.getLogger(GrpcConsumerConcurrentTest.class);
  
      private static final int GRPC_ASYNC_REQUEST_TEST_PORT = AvailablePortFinder.getNextAvailable();
      private static final int GRPC_HEADERS_TEST_PORT = AvailablePortFinder.getNextAvailable();
      private static final int CONCURRENT_THREAD_COUNT = 30;
      private static final int ROUNDS_PER_THREAD_COUNT = 10;
      private static final String GRPC_TEST_PING_VALUE = "PING";
      private static final String GRPC_TEST_PONG_VALUE = "PONG";
      private static final String GRPC_USER_AGENT_PREFIX = "user-agent-";
      private static AtomicInteger idCounter = new AtomicInteger();
  
      public static Integer createId() {
          return idCounter.getAndIncrement();
      }
  
      public static Integer getId() {
          return idCounter.get();
      }
  
      @Test
      public void testAsyncWithConcurrentThreads() {
          RunnableAssert ra = new RunnableAssert("foo") {
  
              @Override
              public void run() {
                  final CountDownLatch latch = new CountDownLatch(1);
                  ManagedChannel asyncRequestChannel
                          = NettyChannelBuilder.forAddress("localhost", GRPC_ASYNC_REQUEST_TEST_PORT).usePlaintext().build();
                  PingPongGrpc.PingPongStub asyncNonBlockingStub = PingPongGrpc.newStub(asyncRequestChannel);
  
                  PongResponseStreamObserver responseObserver = new PongResponseStreamObserver(latch);
                  int instanceId = createId();
  
                  final PingRequest pingRequest
                          = PingRequest.newBuilder().setPingName(GRPC_TEST_PING_VALUE).setPingId(instanceId).build();
                  StreamObserver<PingRequest> requestObserver = asyncNonBlockingStub.pingAsyncAsync(responseObserver);
                  requestObserver.onNext(pingRequest);
                  requestObserver.onNext(pingRequest);
                  requestObserver.onCompleted();
                  try {
                      assertTrue(latch.await(5, TimeUnit.SECONDS));
                  } catch (InterruptedException e) {
                      LOG.debug("Unhandled exception (probably safe to ignore): {}", e.getMessage(), e);
                  }
  
                  PongResponse pongResponse = responseObserver.getPongResponse();
  
                  assertNotNull(pongResponse, "instanceId = " + instanceId);
                  assertEquals(instanceId, pongResponse.getPongId());
                  assertEquals(GRPC_TEST_PING_VALUE + GRPC_TEST_PONG_VALUE, pongResponse.getPongName());
  
                  asyncRequestChannel.shutdown().shutdownNow();
              }
          };
  
          new MultithreadingTester().add(ra).numThreads(CONCURRENT_THREAD_COUNT).numRoundsPerThread(ROUNDS_PER_THREAD_COUNT)
                  .run();
      }
  
      @Test
      public void testHeadersWithConcurrentThreads() {
          RunnableAssert ra = new RunnableAssert("foo") {
  
              @Override
              public void run() {
                  int instanceId = createId();
                  final CountDownLatch latch = new CountDownLatch(1);
                  ManagedChannel asyncRequestChannel = NettyChannelBuilder.forAddress("localhost", GRPC_HEADERS_TEST_PORT)
                          .userAgent(GRPC_USER_AGENT_PREFIX + instanceId)
                          .usePlaintext().build();
                  PingPongGrpc.PingPongStub asyncNonBlockingStub = PingPongGrpc.newStub(asyncRequestChannel);
  
                  PongResponseStreamObserver responseObserver = new PongResponseStreamObserver(latch);
  
                  final PingRequest pingRequest
                          = PingRequest.newBuilder().setPingName(GRPC_TEST_PING_VALUE).setPingId(instanceId).build();
                  StreamObserver<PingRequest> requestObserver = asyncNonBlockingStub.pingAsyncAsync(responseObserver);
                  requestObserver.onNext(pingRequest);
                  requestObserver.onNext(pingRequest);
                  requestObserver.onCompleted();
                  try {
                      assertTrue(latch.await(5, TimeUnit.SECONDS));
                  } catch (InterruptedException e) {
                      LOG.debug("Interrupted while waiting for the response", e);
                  }
  
                  PongResponse pongResponse = responseObserver.getPongResponse();
  
                  assertNotNull(pongResponse, "instanceId = " + instanceId);
                  assertEquals(instanceId, pongResponse.getPongId());
                  assertEquals(GRPC_USER_AGENT_PREFIX + instanceId, pongResponse.getPongName());
  
                  asyncRequestChannel.shutdown().shutdownNow();
              }
          };
  
          new MultithreadingTester().add(ra).numThreads(CONCURRENT_THREAD_COUNT).numRoundsPerThread(ROUNDS_PER_THREAD_COUNT)
                  .run();
      }
  
      @Override
      protected RouteBuilder createRouteBuilder() {
          return new RouteBuilder() {
              @Override
              public void configure() {
                  from("grpc://localhost:" + GRPC_ASYNC_REQUEST_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?synchronous=true&consumerStrategy=AGGREGATION")
                          .bean(new GrpcMessageBuilder(), "buildAsyncPongResponse");
  
                  from("grpc://localhost:" + GRPC_HEADERS_TEST_PORT
                       + "/org.apache.camel.component.grpc.PingPong?synchronous=true&consumerStrategy=AGGREGATION")
                          .process(new HeaderExchangeProcessor());
              }
          };
      }
  
      public class PongResponseStreamObserver implements StreamObserver<PongResponse> {
          private PongResponse pongResponse;
          private final CountDownLatch latch;
  
          public PongResponseStreamObserver(CountDownLatch latch) {
              this.latch = latch;
          }
  
          public PongResponse getPongResponse() {
              return pongResponse;
          }
  
          @Override
          public void onNext(PongResponse value) {
              pongResponse = value;
          }
  
          @Override
          public void onError(Throwable t) {
              LOG.info("Exception", t);
              latch.countDown();
          }
  
          @Override
          public void onCompleted() {
              latch.countDown();
          }
      }
  
      static class GrpcMessageBuilder {
          public PongResponse buildAsyncPongResponse(List<PingRequest> pingRequests) {
              return PongResponse.newBuilder().setPongName(pingRequests.get(0).getPingName() + GRPC_TEST_PONG_VALUE)
                      .setPongId(pingRequests.get(0).getPingId()).build();
          }
      }
  
      static class HeaderExchangeProcessor implements Processor {
  
          @Override
          @SuppressWarnings("unchecked")
          public void process(Exchange exchange) {
              List<PingRequest> pingRequests = (List<PingRequest>) exchange.getIn().getBody();
              String userAgentName = (String) exchange.getIn().getHeader(GrpcConstants.GRPC_USER_AGENT_HEADER);
  
              // As user agent name is prepended the library's user agent
              // information it's necessary to extract this value (before first
              // space)
              PongResponse pongResponse
                      = PongResponse.newBuilder().setPongName(userAgentName.substring(0, userAgentName.indexOf(' ')))
                              .setPongId(pingRequests.get(0).getPingId())
                              .build();
              exchange.getIn().setBody(pongResponse);
          }
      }
  }
  