| /* |
| * 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.sdk.io.gcp.pubsublite; |
| |
| import com.google.api.core.ApiFuture; |
| import com.google.api.core.ApiFutureCallback; |
| import com.google.api.core.ApiFutures; |
| import com.google.api.core.ApiService.Listener; |
| import com.google.api.core.ApiService.State; |
| import com.google.api.gax.rpc.ApiException; |
| import com.google.cloud.pubsublite.Message; |
| import com.google.cloud.pubsublite.MessageMetadata; |
| import com.google.cloud.pubsublite.internal.CheckedApiException; |
| import com.google.cloud.pubsublite.internal.ExtractStatus; |
| import com.google.cloud.pubsublite.internal.Publisher; |
| import com.google.cloud.pubsublite.internal.wire.SystemExecutors; |
| import com.google.cloud.pubsublite.proto.PubSubMessage; |
| import com.google.errorprone.annotations.concurrent.GuardedBy; |
| import java.util.ArrayDeque; |
| import java.util.Deque; |
| import java.util.function.Consumer; |
| import org.apache.beam.sdk.io.gcp.pubsublite.PublisherOrError.Kind; |
| import org.apache.beam.sdk.transforms.DoFn; |
| |
| /** A sink which publishes messages to Pub/Sub Lite. */ |
| @SuppressWarnings({ |
| "nullness" // TODO(https://issues.apache.org/jira/browse/BEAM-10402) |
| }) |
| class PubsubLiteSink extends DoFn<PubSubMessage, Void> { |
| private final PublisherOptions options; |
| |
| @GuardedBy("this") |
| private transient PublisherOrError publisherOrError; |
| |
| // Whenever outstanding is decremented, notify() must be called. |
| @GuardedBy("this") |
| private transient int outstanding; |
| |
| @GuardedBy("this") |
| private transient Deque<CheckedApiException> errorsSinceLastFinish; |
| |
| PubsubLiteSink(PublisherOptions options) { |
| this.options = options; |
| } |
| |
| @Setup |
| public void setup() throws ApiException { |
| Publisher<MessageMetadata> publisher; |
| if (options.usesCache()) { |
| publisher = PerServerPublisherCache.PUBLISHER_CACHE.get(options); |
| } else { |
| publisher = Publishers.newPublisher(options); |
| } |
| synchronized (this) { |
| outstanding = 0; |
| errorsSinceLastFinish = new ArrayDeque<>(); |
| publisherOrError = PublisherOrError.ofPublisher(publisher); |
| } |
| // cannot declare in inner class since 'this' means something different. |
| Consumer<Throwable> onFailure = |
| t -> { |
| synchronized (this) { |
| publisherOrError = PublisherOrError.ofError(ExtractStatus.toCanonical(t)); |
| } |
| }; |
| publisher.addListener( |
| new Listener() { |
| @Override |
| public void failed(State s, Throwable t) { |
| onFailure.accept(t); |
| } |
| }, |
| SystemExecutors.getFuturesExecutor()); |
| if (!options.usesCache()) { |
| publisher.startAsync(); |
| } |
| } |
| |
| private synchronized void decrementOutstanding() { |
| --outstanding; |
| notify(); |
| } |
| |
| @ProcessElement |
| public synchronized void processElement(@Element PubSubMessage message) |
| throws CheckedApiException { |
| ++outstanding; |
| if (publisherOrError.getKind() == Kind.ERROR) { |
| throw publisherOrError.error(); |
| } |
| ApiFuture<MessageMetadata> future = |
| publisherOrError.publisher().publish(Message.fromProto(message)); |
| // cannot declare in inner class since 'this' means something different. |
| Consumer<Throwable> onFailure = |
| t -> { |
| synchronized (this) { |
| decrementOutstanding(); |
| errorsSinceLastFinish.push(ExtractStatus.toCanonical(t)); |
| } |
| }; |
| ApiFutures.addCallback( |
| future, |
| new ApiFutureCallback<MessageMetadata>() { |
| @Override |
| public void onSuccess(MessageMetadata messageMetadata) { |
| decrementOutstanding(); |
| } |
| |
| @Override |
| public void onFailure(Throwable t) { |
| onFailure.accept(t); |
| } |
| }, |
| SystemExecutors.getFuturesExecutor()); |
| } |
| |
| // Intentionally don't flush on bundle finish to allow multi-sink client reuse. |
| @FinishBundle |
| public synchronized void finishBundle() throws CheckedApiException, InterruptedException { |
| while (outstanding > 0) { |
| wait(); |
| } |
| if (!errorsSinceLastFinish.isEmpty()) { |
| CheckedApiException canonical = errorsSinceLastFinish.pop(); |
| while (!errorsSinceLastFinish.isEmpty()) { |
| canonical.addSuppressed(errorsSinceLastFinish.pop()); |
| } |
| throw canonical; |
| } |
| if (publisherOrError.getKind() == Kind.ERROR) { |
| throw publisherOrError.error(); |
| } |
| } |
| } |