- Introduction
- 1. Legal Notice
- 2. Preface
- 3. Project Info
- 4. Messaging Concepts
- 5. Architecture
- 6. Using the Server
- 7. Using JMS
- 8. Using Core
- 9. Mapping JMS Concepts to the Core API
- 10. The Client Classpath
- 11. Examples
- 12. Routing Messages With Wild Cards
- 13. Understanding the Apache ActiveMQ Artemis Wildcard Syntax
- 14. Filter Expressions
- 15. Persistence
- 16. Configuring Transports
- 17. Detecting Dead Connections
- 18. Detecting Slow Consumers
- 19. Resource Manager Configuration
- 20. Flow Control
- 21. Guarantees of sends and commits
- 22. Message Redelivery and Undelivered Messages
- 23. Message Expiry
- 24. Large Messages
- 25. Paging
- 26. Queue Attributes
- 27. Scheduled Messages
- 28. Last-Value Queues
- 29. Message Grouping
- 30. Extra Acknowledge Modes
- 31. Management
- 32. Security
- 33. Resource Limits
- 34. The JMS Bridge
- 35. Client Reconnection and Session Reattachment
- 36. Diverting and Splitting Message Flows
- 37. Core Bridges
- 38. Duplicate Message Detection
- 39. Clusters
- 40. High Availability and Failover
- 41. Graceful Server Shutdown
- 42. Libaio Native Libraries
- 43. Thread management
- 44. Logging
- 45. REST Interface
- 46. Embedding Apache ActiveMQ Artemis
- 47. Spring Integration
- 48. AeroGear Integration
- 49. VertX Integration
- 50. Intercepting Operations
- 51. Protocols and Interoperability
- 52. Tools
- 53. Maven Plugin
- 54. Troubleshooting and Performance Tuning
- 55. Configuration Reference
- Published using GitBook

# ActiveMQ Artemis Documentation

# Scheduled Messages

Scheduled messages differ from normal messages in that they won't be delivered until a specified time in the future, at the earliest.

To do this, a special property is set on the message before sending it.

## Scheduled Delivery Property

The property name used to identify a scheduled message is `"_AMQ_SCHED_DELIVERY"` (or the constant `Message.HDR_SCHEDULED_DELIVERY_TIME`).

The specified value must be a positive `long` corresponding to the time the message must be delivered (in milliseconds). An example of sending a scheduled message using the JMS API is as follows.

    TextMessage message = session.createTextMessage("This is a scheduled message message which will be delivered in 5 sec.");
    message.setLongProperty("_AMQ_SCHED_DELIVERY", System.currentTimeMillis() + 5000);
    producer.send(message);

    ...

    // message will not be received immediately but 5 seconds later
    TextMessage messageReceived = (TextMessage) consumer.receive();

Scheduled messages can also be sent using the core API, by setting the same property on the core message before sending.

## Example

See the examples chapter for an example which shows how scheduled messages can be used with JMS.