Routing Slip for MassTransit v2 (built into MassTransit v3)
C# Ruby
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README.md

MassTransit-Courier

An implementation of the routing slip pattern (EIP: Routing Slip), including activity execution and compensation.

Routing Slip

A routing slip contains a tracking number, an itinerary, and an activity log. The tracking number is used to uniquely identify the routing slip as it moves through the system.

Itinerary

The itinerary is a list of activities to be executed. Activites are executed in order. Once completed, an event is published that the routing slip was ran to completion.

Activities

An activity is code that is executed when a routing slip is received. This could include an inventory check, an authorization step, or anything other processing. An activity can also be compensated using the log information saved by the activity when executed.

Activity Log

The activity log contains log entries of activites that have been executed. The log is used to allow activites to be compensated, and a compensation URI is included of each log entry.

Activity Host

An activity host manages the connection between MassTransit and the Activity. There are two hosts, one for execution and the other for compensation. Only one host can exist on an endpoint, and the execute and compensate hosts should be on separate endpoints. Activities are identified purely by URI, and therefore cannot share endpoints. This means only one host per endpoint, no exceptions!