Package com.google.cloud.pubsub.v1

Interface MessageReceiver

All Known Implementing Classes:

OpenCensusUtil.OpenCensusMessageReceiver

public interface MessageReceiver

This interface can be implemented by users of Subscriber to receive messages.

Method Summary

Modifier and Type	Method	Description
void	receiveMessage(PubsubMessage message, AckReplyConsumer consumer)	Called when a message is received by the subscriber.

Method Details

receiveMessage

void receiveMessage(PubsubMessage message,
 AckReplyConsumer consumer)

Called when a message is received by the subscriber. The implementation must arrange for AckReplyConsumer.ack() or AckReplyConsumer.nack() to be called after processing the message.

 // 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();
         }
       }
     };