guide/concepts/policies.md - brooklyn-docs - Git at Google

 ---
 title: Policies
 layout: website-normal
 toc: ../guide_toc.json
 categories: [use, guide, defining-applications]
 ---

 Policies perform the active management enabled by Brooklyn. Entities can have zero or more ``Policy`` instances attached to them.

 Policies can subscribe to sensors from entities or run periodically, and
 when they run they can perform calculations, look up other values, and if deemed necessary invoke effectors or emit sensor values from the entity with which they are associated.
	---
	title: Policies
	layout: website-normal
	toc: ../guide_toc.json
	categories: [use, guide, defining-applications]
	---

	Policies perform the active management enabled by Brooklyn. Entities can have zero or more ``Policy`` instances attached to them.

	Policies can subscribe to sensors from entities or run periodically, and
	when they run they can perform calculations, look up other values, and if deemed necessary invoke effectors or emit sensor values from the entity with which they are associated.