Class: Cache

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

Direct Known Subclasses

FileCache

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Cache

Returns a new instance of Cache.



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# File 'lib/libcache/cache.rb', line 8

def initialize
  ENV['TZ'] = 'UTC'
  @scheduler = Rufus::Scheduler.new
  @time_tracker = Hash.new
end

Instance Attribute Details

#expiry_time ⇒ Object

Returns the value of attribute expiry_time.



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# File 'lib/libcache/cache.rb', line 6

def expiry_time
  @expiry_time
end

#max_size ⇒ Object

Returns the value of attribute max_size.



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# File 'lib/libcache/cache.rb', line 6

def max_size
  @max_size
end

#refresh ⇒ Object

Returns the value of attribute refresh.



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# File 'lib/libcache/cache.rb', line 6

def refresh
  @refresh
end

#store ⇒ Object

Returns the value of attribute store.



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# File 'lib/libcache/cache.rb', line 6

def store
  @store
end

Instance Method Details

#check_refresh(key) ⇒ Object 



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# File 'lib/libcache/cache.rb', line 44

def check_refresh(key)
  if @cache[key] == nil && !has_refresh?
    val = refresh.call(key)
    put(key, val)
    return val
  end
end

#create_store ⇒ Object 



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# File 'lib/libcache/cache.rb', line 14

def create_store
  @cache = Hash.new
end

#exists?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libcache/cache.rb', line 39

def exists?(key)
  return @cache.key?(key)
end

#get(key) ⇒ Object 



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# File 'lib/libcache/cache.rb', line 34

def get(key)
  check_refresh(key)
  return @cache[key]
end

#has_refresh? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libcache/cache.rb', line 52

def has_refresh?
  return refresh == nil
end

#invalidate(key) ⇒ Object 



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# File 'lib/libcache/cache.rb', line 56

def invalidate(key)
  @cache.delete key
end

#invalidateAll ⇒ Object 



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# File 'lib/libcache/cache.rb', line 60

def invalidateAll
  @cache.clear
end

#put(key, value) ⇒ Object 



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# File 'lib/libcache/cache.rb', line 18

def put(key, value)
  # removed oldest entry if max_size is approached

  if max_size != nil
    if @cache.size >= max_size
      key, value = @time_tracker.values.sort {|v| Time.now - v }.reverse.first
      invalidate(key)
      @time_tracker.delete(key)
    end
    @time_tracker[key] = Time.now
  end
  @cache[key] = value
  @scheduler.in expiry_time, :blocking => true do
    invalidate key
  end
end