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WrappingPublisher.java
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WrappingPublisher.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.cloudpubsub.internal;
import static com.google.cloud.pubsublite.internal.ExtractStatus.toCanonical;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutures;
import com.google.api.gax.rpc.ApiException;
import com.google.cloud.pubsublite.Message;
import com.google.cloud.pubsublite.MessageMetadata;
import com.google.cloud.pubsublite.MessageTransformer;
import com.google.cloud.pubsublite.cloudpubsub.Publisher;
import com.google.cloud.pubsublite.internal.CheckedApiException;
import com.google.cloud.pubsublite.internal.ProxyService;
import com.google.cloud.pubsublite.internal.wire.SystemExecutors;
import com.google.pubsub.v1.PubsubMessage;
// A WrappingPublisher wraps the wire protocol client with a Cloud Pub/Sub api compliant
// publisher. It encodes a MessageMetadata object in the response string.
public class WrappingPublisher extends ProxyService implements Publisher {
private final com.google.cloud.pubsublite.internal.Publisher<MessageMetadata> wirePublisher;
private final MessageTransformer<PubsubMessage, Message> transformer;
public WrappingPublisher(
com.google.cloud.pubsublite.internal.Publisher<MessageMetadata> wirePublisher,
MessageTransformer<PubsubMessage, Message> transformer)
throws ApiException {
super(wirePublisher);
this.wirePublisher = wirePublisher;
this.transformer = transformer;
}
// Publisher implementation.
@Override
public ApiFuture<String> publish(PubsubMessage message) {
Message wireMessage;
try {
wireMessage = transformer.transform(message);
} catch (Throwable t) {
CheckedApiException e = toCanonical(t);
onPermanentError(e);
return ApiFutures.immediateFailedFuture(e.underlying);
}
return ApiFutures.transform(
wirePublisher.publish(wireMessage),
MessageMetadata::encode,
SystemExecutors.getFuturesExecutor());
}
}