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CloudPubsubChecks.java
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CloudPubsubChecks.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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 com.google.cloud.pubsublite.beam;
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;
});
}
}