• Agents are autonomous!
• A promise is a signal or message perceived by
an observer.!
• Promises may or may not be kept.!
• Agents can observe other agents!
• Agents only have local information *!
• Inner workings of agents are assumed to be
unknown
http://markburgess.org/BookOfPromises.pdf
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• Agents have intentions (possible
behaviors)!
• Agents can make assessments about
other agents
http://markburgess.org/BookOfPromises.pdf
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• Configuration Management tools embody
tenants of Promise Theory intentionally or
not
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Domain Specific Languages
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!
DSLs restrict machine
instructions to
convergent operations
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!
DSLs manage
ordering
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type subject intentions
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type
subject intentions
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signal
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type subject
intention
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observation
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type
subject
intentions
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type
intention
subject
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signal
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Intermission
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Part 3
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Composition
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Recipes
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resource one
resource two
resource three
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{
testable
intent
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recipe[http::server]
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recipe[http::server]
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recipes
supporting files
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Types
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interface
implementation
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intentions
parameters
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new scope
intention implementation
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new scope
intention implementation
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Artifacts
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metadata
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metadata
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http v0.1.0
chef-server api
yum v3.0.0
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Delivery
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• nodes request their own initial run_list
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recipe[httpd::server]
chef-server api
run_list:
http v0.1.0
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recipe[httpd::server]
chef-server api
run_list:
http v0.1.0
recipe[openssh::server]
openssh v3.2.1