public abstract 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 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();
}
}
};