Pattern Matching Examples

Simple Correlation

Collects Order and Fulfillment events based on their Customer IDs.

define pattern /OrderTracker
using /Order as order and /Fulfillment as fulfillment
with order.customerId and fulfillment.customerId
starts with order then fulfillment

Simple Temporal Correlation

Collects Order and Fulfillment events based on their Customer IDs such that Fulfillment occurs within 10 minutes of placing the order.

define pattern /OrderFullfilmentSLA
using /Order as order and /Fulfillment as fulfillment
with order.customerId and fulfillment.customerId
starts with order then within 10 minutes fulfillment

A pattern instance is created when the Order event arrives. If a corresponding Fulfillment event does not follow within 10 minutes of the Order event, then the Failure listener is triggered. If the event does arrive on time, then the Success listener is invoked.

Duplicate Suppression – Store and Forward

Collects related events of the same type that share the same correlation ID.

define pattern /ShipmentAggregator
using /Shipment as shipment
with shipment.destinationState
starts with shipment
then within 2 hours repeat 0 to 49 times shipment

This pattern aggregates at most 50 Shipment events within a span of two hours. it uses the event's destinationState as the correlation property. When the first shipment event arrives, the pattern instance is created. Then the timer starts and the pattern instance waits for two hours, accumulating a maximum of 49 more shipment events.