Acknowledgment Batching

The AMPS JavaScript client automatically batches acknowledgments when either of the convenience methods is used. Batching acknowledgments reduces the number of round-trips to AMPS, which reduces network traffic and improves overall performance. AMPS sends the batch of acknowledgments when the number of acknowledgments exceeds a specified size, or when the amount of time since the last batch was sent exceeds a specified timeout.

You can set the number of messages to batch and the maximum amount of time between batches, as shown below:

client.ackBatchSize(10);  // Send batch after 10 messages
client.ackTimeout(1000);  // ... or 1 second

The AMPS JavaScript client is aware of the subscription backlog for a subscription. When AMPS returns the acknowledgment for a subscription that contains queues, AMPS includes information on the subscription backlog for the subscription. If the requested batch size is larger than the subscription backlog, the AMPS JavaScript client adjusts the requested batch size to match the subscription backlog.