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AMPS JavaScript Client 5.3.4
AMPS JavaScript Client 5.3.4
  • Welcome to the AMPS JavaScript Client
    • Before You Start
    • Obtaining and Installing the JavaScript Client
    • Your First AMPS Program
      • Client Identification
      • Connection Strings For AMPS
      • Providing Credentials to AMPS
    • Subscriptions
      • Content Filtering
        • Changing the Filter on a Subscription
      • Understanding Message Objects
      • Promises and Message Handlers
      • Regular Expression Subscriptions
      • Ending Subscriptions
    • Error Handling
      • Disconnect Handling
        • Using a Heartbeat to Detect Disconnection
        • Managing Disconnection
        • Replacing Disconnect Handling
      • Unhandled Errors
    • State of the World
      • SOW and Subscribe
      • Setting Batch Size
      • Managing SOW Contents
    • Using Queues
      • Backlog and Smart Pipelining
      • Acknowledging Messages
      • Acknowledgment Batching
      • Returning a Message to the Queue
      • Manual Acknowledgment
    • Delta Publish and Subscribe
      • Delta Subscribe
      • Delta Publish
    • High Availability
    • AMPS Programming: Working with Commands
    • Message Types
    • Advanced Topics
    • AMPS Server Documentation
    • API Documentation
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  1. Welcome to the AMPS JavaScript Client
  2. Using Queues

Returning a Message to the Queue

A subscriber can also explicitly release a message back to the queue. AMPS returns the message to the queue, and redelivers the message just as though the lease had expired. To do this, the subscriber sends a sow_delete command with the bookmark of the message to release and the cancel option.

client.execute(
  new Command('sow_delete')
      .topic(message.header.topic())
      .bookmark(message.header.bookmark())
      .options('cancel');
);

When using automatic acknowledgments, AMPS will cancel a message if an exception is thrown from the message handler.

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Last updated 3 months ago