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I want to trigger a long running background process (coded as a service) from the ui. But I also want to show some progress of that task to the user.
How can I achieve this? (I want to not infringe on decoupling).
Is there a best practice to solve it (combining design-patterns, eg. observer and command)?
Here is an example on how to use just the observer pattern to show
progress in the UI. With JAVA sample code provided:
Using Observer Pattern to track progress while loading a page