Class: LocalCacheStore

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

Overview

Implements a local in-memory cache store.

Instance Method Summary collapse

Constructor Details

#initialize(_namespace = nil) ⇒ LocalCacheStore 



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# File 'lib/cache_store.rb', line 43

def initialize(_namespace = nil)
  @store = {}
end

Instance Method Details

#exist?(key) ⇒ Boolean

Checks if a value exists within this cache store for a specific key.



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# File 'lib/cache_store.rb', line 97

def exist?(key)
  @store.key? key
end

#get(key, expires_in = 0) ⇒ Object

Gets a value from this cache store by its unique key.



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# File 'lib/cache_store.rb', line 64

def get(key, expires_in = 0)
  item = @store[key]
  if item
    if item[:expires] && item[:expires] < Time.now # An expired entry has been found
      if block_given?
        value = yield
        set(key, value, expires_in)
        return value
      else
        remove(key)
        return nil
      end
    else # An item was found which has not expired
      return item[:value]
    end
  elsif block_given?
    value = yield
    set(key, value, expires_in)
    return value
  end
end

#remove(key) ⇒ Object

Removes a value from this cache store by its unique key.



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# File 'lib/cache_store.rb', line 89

def remove(key)
  @store.delete key
end

#set(key, value, expires_in = 0) ⇒ Object

Stores a value in this cache store by its key.



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# File 'lib/cache_store.rb', line 52

def set(key, value, expires_in = 0)
  if expires_in > 0
    expires = Time.now + expires_in
  end
  @store.store(key, {value: value, expires: expires})
end