Class: Autoscaler::HerokuScaler
- Inherits:
-
Object
- Object
- Autoscaler::HerokuScaler
- Defined in:
- lib/autoscaler/heroku_scaler.rb
Overview
Wraps the Heroku API to provide just the interface that we need for scaling.
Instance Attribute Summary collapse
-
#app ⇒ Object
readonly
Returns the value of attribute app.
-
#exception_handler ⇒ Object
writeonly
Callable object which responds to exceptions during api calls #.
-
#type ⇒ Object
readonly
Returns the value of attribute type.
Instance Method Summary collapse
-
#counter_cache=(cache) ⇒ Object
Object which supports #counter and #counter= Defaults to CounterCacheMemory.
-
#initialize(type = 'worker', key = ENV['HEROKU_API_KEY'], app = ENV['HEROKU_APP']) ⇒ HerokuScaler
constructor
A new instance of HerokuScaler.
-
#workers ⇒ Numeric
Read the current worker count (value may be cached).
-
#workers=(n) ⇒ Object
Set the number of workers (noop if workers the same).
Constructor Details
#initialize(type = 'worker', key = ENV['HEROKU_API_KEY'], app = ENV['HEROKU_APP']) ⇒ HerokuScaler
Returns a new instance of HerokuScaler.
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# File 'lib/autoscaler/heroku_scaler.rb', line 10 def initialize( type = 'worker', key = ENV['HEROKU_API_KEY'], app = ENV['HEROKU_APP']) @client = Heroku::API.new(:api_key => key) @type = type @app = app @workers = CounterCacheMemory.new end |
Instance Attribute Details
#app ⇒ Object (readonly)
Returns the value of attribute app.
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# File 'lib/autoscaler/heroku_scaler.rb', line 20 def app @app end |
#exception_handler=(value) ⇒ Object
Callable object which responds to exceptions during api calls #
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# File 'lib/autoscaler/heroku_scaler.rb', line 50 def exception_handler=(value) @exception_handler = value end |
#type ⇒ Object (readonly)
Returns the value of attribute type.
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# File 'lib/autoscaler/heroku_scaler.rb', line 21 def type @type end |
Instance Method Details
#counter_cache=(cache) ⇒ Object
Object which supports #counter and #counter= Defaults to CounterCacheMemory
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# File 'lib/autoscaler/heroku_scaler.rb', line 54 def counter_cache=(cache) @workers = cache end |
#workers ⇒ Numeric
Read the current worker count (value may be cached)
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# File 'lib/autoscaler/heroku_scaler.rb', line 25 def workers @workers.counter {@workers.counter = heroku_get_workers} end |
#workers=(n) ⇒ Object
Set the number of workers (noop if workers the same)
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# File 'lib/autoscaler/heroku_scaler.rb', line 31 def workers=(n) unknown = false current = @workers.counter{unknown = true; 1} if n != current || unknown p "Scaling #{type} to #{n}" heroku_set_workers(n) @workers.counter = n end end |