Snippets created by Daniel Bradley

  • Event stream projection with actors

    An example of using an actor (MailboxProcessor) to coordinate the projection of events from an event stream into a persisted projection. This example covers handling simple concurrency conflicts via also persisting and checking the latest event ID with with projection. The update command will take the current projection and apply all new events before persisting it back. The rebuild command will ignore an existing projection and replay all events in the stream.

    3 people like this

    Posted: 2 years ago by Daniel Bradley

  • Parallel recursive crawler using agents

    The aim here is to demonstrate a method of distributing work using the built in F# agent across multiple nodes in parallel the result of crawling one page might result in finding multiple new pages to fetch. This is a recursive process which will continue until no new URLs are found. The main focus is how to process a potentially indefinite queue of work across a pool of workers, rather than how to parse web pages.

    3 people like this

    Posted: 8 months ago by Daniel Bradley