8. Scenario and Feature Reference¶
AMPS offers a wide array of messaging features to solve a variety of messaging scenarios. This section presents some basic mappings between common messaging scenarios and the AMPS features that support those scenarios. Of course, this list is just a sampling of the types of applications that use AMPS.
| Scenario | AMPS Feature(s) |
|---|---|
| Simple, low-latency publish and subscribe (many to many messaging) with no need to persist messages. | Ad hoc Publish and Subscribe |
| Publish and subscribe with a replayable audit trail. | Transaction Log and Bookmark Subscription |
| Snapshot of the current state of a set of messages (for example, graphing the elapsed time for all pending orders). | State of the World (SOW) |
| Creating a view server that aggregates information about a high-velocity data feed for reporting. | State of the World (SOW) Views and Aggregation Transaction Log and Replication |
| Snapshot of the current state of a set of messages followed by updates to those messages (for example, showing the current status of a set of orders when a UI starts and then showing real-time updates to those messages). | State of the World (SOW) SOW and Subscribe from client application |
| Ensuring that a given message is processed once, by a single subscriber (for example, a workload distribution system). | Message Queues |
| Replaying messages from a point in time. | Transaction Log and Bookmark Subscription |
| Transforming messages as they are published to AMPS. | State of the World (SOW) and Enrichment |
| Producing aggregate data for a stream of messages. | State of the World (SOW) and Views or Aggregated Subscriptions |
| Coordinating work across a set of independent workers who are each assigned discrete tasks. | Message Queues |
| Dividing work among a set of workers who each update a portion of a record. | State of the World (SOW) and Delta Publish |
| Providing highly available messaging with multiple servers providing failover. | Transaction Log and Replication |
The scenarios above describe just a few of the more common scenarios in which AMPS is used. For messaging scenarios that aren’t described above, contact 60East at http://support.crankuptheamps.com/ for advice and guidance.