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ChatServiceImpl.java
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ChatServiceImpl.java
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/*
* Copyright 2016 Google, Inc.
*
* 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.
*/
package com.example.grpc.chat;
import com.google.protobuf.Timestamp;
import io.grpc.stub.StreamObserver;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* Created by rayt on 5/16/16.
*/
public class ChatServiceImpl extends ChatServiceGrpc.ChatServiceImplBase {
// @aiborisov mentioned this needs to be thread safe. It was using non-thread-safe HashSet
private static Set<StreamObserver<Chat.ChatMessageFromServer>> observers = ConcurrentHashMap.newKeySet();
// Collections.newSetFromMap(new ConcurrentHashMap<>());
@Override
public StreamObserver<Chat.ChatMessage> chat(StreamObserver<Chat.ChatMessageFromServer> responseObserver) {
observers.add(responseObserver);
return new StreamObserver<Chat.ChatMessage>() {
@Override
public void onNext(Chat.ChatMessage value) {
System.out.println(value);
Chat.ChatMessageFromServer message = Chat.ChatMessageFromServer.newBuilder()
.setMessage(value)
.setTimestamp(Timestamp.newBuilder().setSeconds(System.currentTimeMillis() / 1000))
.build();
for (StreamObserver<Chat.ChatMessageFromServer> observer : observers) {
observer.onNext(message);
}
}
@Override
public void onError(Throwable t) {
// do something;
}
@Override
public void onCompleted() {
observers.remove(responseObserver);
}
};
}
}