Class: TheArrayComparator::Cache

Inherits:
StrategyDispatcher show all
Defined in:
lib/the_array_comparator/cache.rb

Overview

caching class

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from StrategyDispatcher

#each, #register, strategy_reader

Constructor Details

#initialize ⇒ Cache

Variable to store available caches



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# File 'lib/the_array_comparator/cache.rb', line 12

def initialize
  super()
  @caches = {}

  register :anonymous_cache, CachingStrategies::AnonymousCache
  register :single_value_cache, CachingStrategies::SingleValueCache
end

Instance Attribute Details

#caches ⇒ Object (readonly)

Returns the value of attribute caches.



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# File 'lib/the_array_comparator/cache.rb', line 9

def caches
  @caches
end

Instance Method Details

#[](cache) ⇒ Object

Retrieve cache

Raises:



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# File 'lib/the_array_comparator/cache.rb', line 41

def [](cache)
  c = cache.to_sym

  raise Exceptions::CacheDoesNotExist, "Unknown cache \":#{c}\" given. Did you create it in advance?"  unless caches.has_key?(c)
  caches[c]
end

#add(cache, strategy) ⇒ Object

Add a new cache

Raises:



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# File 'lib/the_array_comparator/cache.rb', line 55

def add(cache,strategy)
  c = cache.to_sym
  s = strategy.to_sym

  raise Exceptions::UnknownCachingStrategy, "Unknown caching strategy \":#{strategy}\" given. Did you register it in advance?"  unless caching_strategies.has_key?(strategy)

  caches[c] = caching_strategies[s].new 
  caches[c]
end

#class_must_have_methods ⇒ Object

See Also:

  • [StrategyDispatcher]


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# File 'lib/the_array_comparator/cache.rb', line 21

def class_must_have_methods
  [
    :add,
    :clear,
    :stored_objects,
    :new_objects?,
    :delete_object,
    :fetch_object,
  ]
end

#exception_to_raise_for_invalid_strategy ⇒ Object

See Also:

  • [StrategyDispatcher]


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# File 'lib/the_array_comparator/cache.rb', line 33

def exception_to_raise_for_invalid_strategy
  Exceptions::IncompatibleCachingStrategy
end