Class: VolatileHash

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

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ VolatileHash

Returns a new instance of VolatileHash.



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# File 'lib/volatile_hash.rb', line 2

def initialize(options)
    @strategy = options[:strategy] || 'ttl'
    @cache = {}
    if @strategy == 'ttl'
        @registry = {}
        @ttl = options[:ttl] || 3600
    else #lru
        @max_items = options[:max] || 10
        @item_order = []
    end
    @refresh = options[:refresh] or false
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/volatile_hash.rb', line 15

def [](key)
    value = @cache[key]
    if @strategy == 'ttl'
        if @registry[key] && expired?(key)
            @cache.delete key
            @registry.delete key
            value = nil
        end
        if @refresh and @registry[key]
            set_ttl(key)
        end
    else
        lru_update key if @cache.has_key?(key)
    end
    value #in case of LRU, just return the value that was read
end

#[]=(key, value) ⇒ Object 



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# File 'lib/volatile_hash.rb', line 32

def []=(key, value)
    if @strategy == 'ttl'
        set_ttl(key)
        @cache[key] = value
    else
        @item_order.unshift key
        @cache[key] = value
        lru_invalidate if @max_items < @item_order.length
    end
end