Class BidiCallable<RequestT,ResponseT> (2.59.1)

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 BidiStream<String, String> stream = bidiCallable.call()
 for (String s : stream) {
   if ("needle".equals(s)) {
     // Cancelling the stream will cause hasNext() to return false on the next iteration,
     // naturally breaking the loop.
     stream.cancel();
   }
   stream.send(s);
 }
 

 final Iterator<Integer> sourceDataIterator = intCollection.iterator();
 BidiStreamObserver<Integer, String> bidiStreamObserver = new BidiStreamObserver<Integer, String>() {
   public void onStart(StreamController controller) {
     // no-op
   }

   public void onResponse(String response) {
     System.out.println(response);
   }

   public void onComplete() {
     System.out.println("done!");
   }

   public void onError(Throwable t) {
     System.out.println("error: " + t);
   }

   public void onReady(ClientStream<Integer> stream) {
     while (sourceDataIterator.hasNext()) {
       if (stream.isReady()) {
         stream.send(sourceDataIterator.next());
       } else {
         // It's OK we haven't consumed the whole iterator;
         // onReady will be called again when the network becomes free.
         return;
       }
     }
     // We ran out of things to send.
     stream.close();
   }
 };

 bidiCallable.call(bidiStreamObserver);
 

 ResponseObserver<String> responseObserver = new ResponseObserver<String>() {
   public void onStart(StreamController controller) {
     // no-op
   }

  public void onResponse(String response) {
    System.out.println(response);
  }

  public void onComplete() {
    System.out.println("done!");
  }

  public void onError(Throwable t) {
    System.out.println("error: " + t);
  }
 };

 ClientStream<Integer> clientStream = bidiCallable.splitCall(responseObserver);
 clientStream.send(42);
 clientStream.send(43);
 clientStream.close();