Active Object Design Pattern

Active Object is a concurrency design pattern used in case you want to separate invocation of a method from its execution. There could be multiple motivation to implement this pattern, for e.g. you may want to avoid race conditions by queuing incoming client request and schedule it or refactor legacy code to introduce concurrency capability. In other words, the goal is to introduce asynchronous method invocation. It is similar to the email attachment in popular providers like Gmail, when we attach a document, it is added in parallel while the user performs other UI actions.

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