Class: Shellac::Storage_engine::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/shellac/storage_engine.rb

Direct Known Subclasses

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Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Base

Returns a new instance of Base.



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# File 'lib/shellac/storage_engine.rb', line 4

def initialize( args = {} )
  @config = _default_args.merge( args )
  @cache_control_thread = new_cache_control_thread
  @cache_size = 0
  @cache = {}
end

Instance Method Details

#[](k) ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 33

def []( k )
  @cache[ k ]
end

#[]=(k, v) ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 41

def []=( k, v )
  @cache_size += v.to_s.length
  @cache[ k ] = v
end

#_default_args ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 11

def _default_args
  {
    preload: {},
    length_limit: 1000,
    size_limit: 1024 * 1024 * 20,
    trim_interval: 30 
  }
end

#delete(k) ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 54

def delete( k )
  @cache.delete( k )
end

#get(k) ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 37

def get( k )
  self[ k ]
end

#keys ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 50

def keys
  @cache.keys
end

#length ⇒ Object Also known as: size 



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# File 'lib/shellac/storage_engine.rb', line 58

def length
  @cache.length
end

#new_cache_control_thread ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 20

def new_cache_control_thread
  Thread.new do
    sleep( @config[ :trim_interval ] )

    while @cache_size > @config[ :size_limit ]
      # Trim Cache -- stupid algorithm just randomly deletes things
      # until it is small enough
      sz = @cache.delete( @cache.keys[ rand( @cache.length ) ] ).to_s.length
      @cache_size -= sz
    end
  end
end

#set(k, v) ⇒ Object 



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# File 'lib/shellac/storage_engine.rb', line 46

def set( k, v )
  self[ k ] = v
end