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/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed 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.
*/
import MyGame.Example.Monster;
import MyGame.Example.MonsterStorageGrpc;
import MyGame.Example.Stat;
import com.google.flatbuffers.FlatBufferBuilder;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;
import io.grpc.Server;
import io.grpc.ServerBuilder;
import org.junit.Assert;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Iterator;
/**
* Demonstrates basic client-server interaction using grpc-java over netty.
*/
public class JavaGrpcTest {
static final String BIG_MONSTER_NAME = "big-monster";
static final short nestedMonsterHp = 600;
static final short nestedMonsterMana = 1024;
static final int numStreamedMsgs = 10;
static class MyService extends MonsterStorageGrpc.MonsterStorageImplBase {
@Override
public void store(Monster request, io.grpc.stub.StreamObserver<Stat> responseObserver) {
Assert.assertEquals(request.name(), BIG_MONSTER_NAME);
Assert.assertEquals(request.hp(), nestedMonsterHp);
Assert.assertEquals(request.mana(), nestedMonsterMana);
System.out.println("Received store request from " + request.name());
// Create a response from the incoming request name.
FlatBufferBuilder builder = new FlatBufferBuilder();
int statOffset = Stat.createStat(builder, builder.createString("Hello " + request.name()), 100, 10);
builder.finish(statOffset);
Stat stat = Stat.getRootAsStat(builder.dataBuffer());
responseObserver.onNext(stat);
responseObserver.onCompleted();
}
@Override
public void retrieve(Stat request, io.grpc.stub.StreamObserver<Monster> responseObserver) {
// Create 10 monsters for streaming response.
for (int i=0; i<numStreamedMsgs; i++) {
FlatBufferBuilder builder = new FlatBufferBuilder();
int i1 = builder.createString(request.id() + " No." + i);
Monster.startMonster(builder);
Monster.addName(builder, i1);
int i2 = Monster.endMonster(builder);
Monster.finishMonsterBuffer(builder, i2);
Monster monster = Monster.getRootAsMonster(builder.dataBuffer());
responseObserver.onNext(monster);
}
responseObserver.onCompleted();
}
}
private static int startServer() throws IOException {
Server server = ServerBuilder.forPort(0).addService(new MyService()).build().start();
return server.getPort();
}
@org.junit.Test
public void testMonster() throws IOException {
int port = startServer();
ManagedChannel channel = ManagedChannelBuilder.forAddress("localhost", port)
// Channels are secure by default (via SSL/TLS). For the example we disable TLS to avoid
// needing certificates.
.usePlaintext(true)
.directExecutor()
.build();
MonsterStorageGrpc.MonsterStorageBlockingStub stub = MonsterStorageGrpc.newBlockingStub(channel);
FlatBufferBuilder builder = new FlatBufferBuilder();
int o_string = builder.createString(BIG_MONSTER_NAME);
Monster.startMonster(builder);
Monster.addName(builder, o_string);
Monster.addHp(builder, nestedMonsterHp);
Monster.addMana(builder, nestedMonsterMana);
int monster1 = Monster.endMonster(builder);
Monster.finishMonsterBuffer(builder, monster1);
ByteBuffer buffer = builder.dataBuffer();
Monster monsterRequest = Monster.getRootAsMonster(buffer);
Stat stat = stub.store(monsterRequest);
Assert.assertEquals(stat.id(), "Hello " + BIG_MONSTER_NAME);
System.out.println("Received stat response from service: " + stat.id());
Iterator<Monster> iterator = stub.retrieve(stat);
int counter = 0;
while(iterator.hasNext()) {
Monster m = iterator.next();
System.out.println("Received monster " + m.name());
counter ++;
}
Assert.assertEquals(counter, numStreamedMsgs);
System.out.println("FlatBuffers GRPC client/server test: completed successfully");
}
}
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