Vert.x

Question

我有通过 DataInputStream 连接的第 3 方代码。第 3 方代码在生成信息时不断吐出信息。当遇到有趣的事情时，我想将其传递给 GraphQL 订阅

在这种情况下，我不确定如何将第三方代码连接到服务器端 GraphQL 订阅代码。任何建议，将不胜感激。

部分概念代码如下：

public void liveStream(DataInputStream in) {
  // Sit and constantly watch input stream and report when messages come in
  while(true) {
    SomeMessage message = readFromInputStream(in);
    System.out.println("Received Message Type:" + message.getType());

    // Convert SomeMessage into the appropriate class based on its type
    if (message.getType() == "foo") {
      Foo foo = convertMessageToFoo(message);
    } else if (message.getType() == "bar") {
      Bar bar = convertMessageToBar(message);
    } else if (howeverManyMoreOfThese) {
      // Keep converting to different objects
    }
  }       
}

// The client code will eventually trigger this method when 
// the GraphQL Subscription query is sent over
VertxDataFetcher<Publisher<SomeClassTBD>> myTestDataFetcher() {
  return new VertxDataFetcher<> (env, future) -> {
    try {
      future.complete(myTest());
    } catch(Exception e) {
      future.fail(e);
    }
  });
}

Answer 1

好的，我使用 executorService 将我的 liveStream 代码包装在一个 ObservableOnSubscribe 中，我正在取回所有数据。我想我现在可以直接将它传递到前端或创建单独的发布者来处理特定的对象类型并让 graphql 订阅指向它们各自的发布者。

ExecutorService executor = Executors.newSingleThreadExecutor;

ObservableOnSubscribe<SomeClassTBD> handler = emitter ->
  executor.submit(() -> {
    try {
      //liveStream code here
      emitter.onComplete();
    }
    catch(Exception e) {
      emitter.onError(e);
    }
    finally {
      // Cleanup here
    }
  });
  Observable<SomeClassTBD> = Observable.create(handler);

Vert.x - 带有 DataInputStreams 的 GraphQL 订阅

Vert.x - GraphQL Subscriptions with DataInputStreams

java

graphql

graphql-java

graphql-subscriptions