![]() For example, an activity that holds a seat for a patron could release the held seat when compensated. In addition to the basic routing slip pattern, MassTransit Courier also supports compensations (opens new window) which allow activities to store execution data so that reversible operations can be undone, using either a traditional rollback mechanism or by applying an offsetting operation. Combining the routing slip pattern with a state machine such as Automatonymous (opens new window)results in a reliable, recoverable, and supportable approach for coordinating and monitoring message processing across multiple services. Leveraging a durable messaging transport and the advanced saga features of MassTransit, Courier provides a powerful set of components to simplify the use of routing slips in distributed applications. MassTransit Courier is a framework that implements the routing slip pattern. ![]() This dynamic behavior is in contrast to a more explicit behavior defined by a state machine or sequential workflow that is statically defined (either through the use of code, a DSL, or something like Windows Workflow). Depending upon the requirements for each transaction, which may differ based on things like payment methods, billing or shipping address, or customer preference ratings, the routing slip builder can selectively add activities to the routing slip. ![]() When all activities have completed, the routing slip is completed and the transaction is complete.Ī key advantage to using a routing slip is it allows the activities to vary for each transaction. You can throw an exception that is caught by the middleware (you can filter exception types, to only redeliver certain types) and MassTransit will handle the redelivery for you. As each activity completes, the routing slip is forwarded to the next activity in the itinerary. 2 The only way I know of doing redelivery with routing slip activities is by using the UseScheduledRedelivery middleware. # Using a Routing SlipĪ routing slip specifies a sequence of processing steps called activities that are combined into a single transaction. Courier also works well with MassTransit sagas, which add transaction monitoring and recoverability. MassTransit Courier is a mechanism for creating and executing distributed transactions with fault compensation that can be used to meet the requirements previously within the domain of database transactions, but built to scale across a large system of distributed services. And in the distributed, microservices based architectures, the use of a single ACID database is shrinking to completely non-existent. There will be no routing changes to eastbound service. However, this doesn't scale when the steps being to include dependencies outside of a single database. Competition and Markets Authority (CMA) has let slip the reason behind Call of Dutys absence. ![]() In an application using an ACID database, this is typically done using SQL transactions, where partial operations are rolled back if the transaction cannot be completed. I found other libraries like NServiceBus and Rebus but they seem to replace "MassTransit saga" not courier, which In my experience testing today seems the better fit.ĭoes any of you guys know any other MassTransit courier (routing slip) alternative, Thanks.Developing applications using a distributed, message-based architecture significantly increases the complexity of performing transactions, where an end-to-end set of steps must be completed entirely, or not at all. So this solution works, but I am trying to find more libraries so I can write the same use case in all of them and then pick the one that best fit us. Investigating a little more the library I found "MassTransit courier" which does what I need to do, it has execute and compensate in an easy way using `IActivity` I still need to figure out how to add distributed locking with Redis and retry, if possible out of the box. I started to play with it, and the sagas were soooooo overcomplicated for what I needed. I've never worked with sagas in this way (sending all the messages from one point) before so I started to do some research and I found MassTransit. If something fails then it has to do a rollback, and I need locking. Hi everybody, I am developing an application (which will be the "base" of what other people in the company will do)my use case is an entry point (triggered by an API endpoint 99% of the time) that should call to múltiple services to insert stuff. ![]()
0 Comments
Leave a Reply. |