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add Command pattern

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Jakub Vojvoda
2016-09-18 19:44:57 +02:00
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## Command
Command pattern encapsulates a request as an object, thereby letting you parameterize
clients with different requests, queue or log requests, and supports undoable
operations. The pattern has a behavioral purpose and deals with relationships between objects.
### When to use
* want to parameterize objects by an action to perform
* want to specify, queue, and execute requests at different times
* support undo
* support logging changes so that they can be reapplied in case of a system crash
* structure a system around high-level operations built on primitives operations