Class: Cash::LocalBuffer

Inherits:
Object
  • Object
show all
Defined in:
lib/cash/local.rb

Constant Summary collapse

MULTI_GET_RESULTS_THRESHOLD = 
1

Instance Method Summary collapse

Constructor Details

#initialize(remote_cache) ⇒ LocalBuffer

Returns a new instance of LocalBuffer.



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# File 'lib/cash/local.rb', line 42

def initialize(remote_cache)
  @local_cache = {}
  @remote_cache = remote_cache
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, *args, &block) ⇒ Object (private) 



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# File 'lib/cash/local.rb', line 101

def method_missing(method, *args, &block)
  @remote_cache.send(method, *args, &block)
end

Instance Method Details

#add(key, value, *options) ⇒ Object 



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# File 'lib/cash/local.rb', line 86

def add(key, value, *options)
  result = @remote_cache.add(key, value, *options)
  if result == "STORED\r\n"
    @local_cache[key] = value
  end
  result
end

#delete(key, *options) ⇒ Object 



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# File 'lib/cash/local.rb', line 94

def delete(key, *options)
  @remote_cache.delete(key, *options)
  @local_cache.delete(key)
end

#get(key, *options) ⇒ Object 



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# File 'lib/cash/local.rb', line 47

def get(key, *options)
  if @local_cache.has_key?(key)
    @local_cache[key]
  else
    @local_cache[key] = @remote_cache.get(key, *options)
  end
end

#get_multi(keys, *options) ⇒ Object

Model.find_by_index() uses get_multi to get the object after getting the id through the index. Simplest way of utilizing the local cache is to override get_multi and use a threshold of 1. Using a higher threshold could be an optimization for get_multi calls returning more than one value.



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# File 'lib/cash/local.rb', line 59

def get_multi(keys, *options)
  results = {}
  remaining_keys = []
  keys.each do |key|
    if @local_cache.has_key?(key)
      results[key] = @local_cache[key]
    else
      remaining_keys << key
    end
  end
  if !remaining_keys.empty?
    multi = @remote_cache.get_multi(remaining_keys, *options)
    if multi
      multi.each do |k,v|
        @local_cache[k] = v if multi.size() <= MULTI_GET_RESULTS_THRESHOLD
        results[k] = v
      end
    end
  end
  results
end

#set(key, value, *options) ⇒ Object 



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# File 'lib/cash/local.rb', line 81

def set(key, value, *options)
  @remote_cache.set(key, value, *options)
  @local_cache[key] = value
end