| /* |
| * 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 static com.google.cloud.pubsublite.cloudpubsub.MessageTransforms.toCpsPublishTransformer; |
| |
| import com.google.cloud.pubsublite.Message; |
| import com.google.cloud.pubsublite.proto.PubSubMessage; |
| import org.apache.beam.sdk.transforms.MapElements; |
| import org.apache.beam.sdk.transforms.PTransform; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.TypeDescriptor; |
| |
| /** |
| * A class providing a conversion validity check between Cloud Pub/Sub and Pub/Sub Lite message |
| * types. |
| */ |
| public final class CloudPubsubChecks { |
| private CloudPubsubChecks() {} |
| |
| /** |
| * Ensure that all messages that pass through can be converted to Cloud Pub/Sub messages using the |
| * standard transformation methods in the client library. |
| * |
| * <p>Will fail the pipeline if a message has multiple attributes per key. |
| */ |
| public static PTransform<PCollection<? extends PubSubMessage>, PCollection<PubSubMessage>> |
| ensureUsableAsCloudPubsub() { |
| return MapElements.into(TypeDescriptor.of(PubSubMessage.class)) |
| .via( |
| message -> { |
| Object unused = toCpsPublishTransformer().transform(Message.fromProto(message)); |
| return message; |
| }); |
| } |
| } |