| /* |
| * 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.beam.runners.dataflow.worker.windmill; |
| |
| import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.stub.ClientCallStreamObserver; |
| import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.stub.ClientResponseObserver; |
| import org.apache.beam.vendor.grpc.v1p13p1.io.grpc.stub.StreamObserver; |
| |
| /** |
| * A {@link ClientResponseObserver} which delegates all {@link StreamObserver} calls. |
| * |
| * <p>Used to wrap existing {@link StreamObserver}s to be able to install an {@link |
| * ClientCallStreamObserver#setOnReadyHandler(Runnable) onReadyHandler}. |
| * |
| * <p>This is as thread-safe as the undering stream observer that is being wrapped. |
| */ |
| final class ForwardingClientResponseObserver<ReqT, RespT> |
| implements ClientResponseObserver<RespT, ReqT> { |
| private final Runnable onReadyHandler; |
| private final Runnable onDoneHandler; |
| private final StreamObserver<ReqT> inboundObserver; |
| |
| ForwardingClientResponseObserver( |
| StreamObserver<ReqT> inboundObserver, Runnable onReadyHandler, Runnable onDoneHandler) { |
| this.inboundObserver = inboundObserver; |
| this.onReadyHandler = onReadyHandler; |
| this.onDoneHandler = onDoneHandler; |
| } |
| |
| @Override |
| public void onNext(ReqT value) { |
| inboundObserver.onNext(value); |
| } |
| |
| @Override |
| public void onError(Throwable t) { |
| onDoneHandler.run(); |
| inboundObserver.onError(t); |
| } |
| |
| @Override |
| public void onCompleted() { |
| onDoneHandler.run(); |
| inboundObserver.onCompleted(); |
| } |
| |
| @Override |
| public void beforeStart(ClientCallStreamObserver<RespT> stream) { |
| stream.setOnReadyHandler(onReadyHandler); |
| } |
| } |