高级模式

Request and wait handshake

Use when

• You send an asynchronous request and wait for a reply or a timeout.
• You need an SLA window and a clean outcome on either path.

Pattern in simple words

1. Start.
2. Send task: Send payment request.
3. Event‑based gateway: wait for one of the following.
   • Message event: Payment received. End Paid.
   • Timer event: Fourteen days elapsed. Service task Close unpaid. End Closed unpaid.

Note: This pattern cleanly models asynchronous communication with an SLA.

Other scenarios

• Finance: Invoice payment versus due‑date closure.
• Insurance: Claim evidence versus expiry.
• Retail: Supplier confirmation versus alternate sourcing.
• Public sector: Response received versus auto‑close.
• Manufacturing: Order acknowledgment versus cancel.

Wait for a specific message with a deadline

Use when

• A precise message is expected before continuing.
• A deadline must trigger escalation if the message does not arrive.

Pattern in simple words

1. Start.
2. Receive task: Await specialist report, with an interrupting boundary timer set to five days.
3. On timer: User task Escalate. End Escalated.
4. Normal path: Receive report. User task Review report. End Reviewed.

Note: The timer defines the SLA and triggers escalation.

Other scenarios

• Finance: Await audit response versus escalation.
• Healthcare: Await patient records versus escalation.
• Retail: Await vendor confirmation versus procurement escalation.
• Manufacturing: Await QA test results versus manager escalation.
• Public sector: Await citizen reply versus auto‑close.