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Java idiomatic client for Google Cloud Pub/Sub
/*
* Copyright 2016 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.pubsub.v1;
import com.google.pubsub.v1.PubsubMessage;
/** This interface can be implemented by users of {@link Subscriber} to receive messages. */
public interface MessageReceiver {
/**
* Called when a message is received by the subscriber. The implementation must arrange for {@link
* AckReplyConsumer#ack()} or {@link AckReplyConsumer#nack()} to be called after processing the
* {@code message}.
*
*
* {@code
* // This {@code MessageReceiver} passes all messages to a {@link BlockingQueue}. This method can
* // be called concurrently from multiple threads, so it is important that the queue be
* // thread-safe.
* //
* // This example is for illustration. Implementations may directly process messages instead of
* // sending them to queues.
* MessageReceiver receiver =
* new MessageReceiver() {
* public void receiveMessage(final PubsubMessage message, final AckReplyConsumer consumer) {
* if (blockingQueue.offer(message)) {
* consumer.ack();
* } else {
* consumer.nack();
* }
* }
* };
*
* }
*
*
*/
void receiveMessage(final PubsubMessage message, final AckReplyConsumer consumer);
}
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