Class: DeviceDetector::MemoryCache

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

Constant Summary collapse

DEFAULT_MAX_KEYS = 
5000
STORES_NIL_VALUE = 
:__is_nil__

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ MemoryCache

Returns a new instance of MemoryCache.



11
12
13
14
15
 
# File 'lib/device_detector/memory_cache.rb', line 11

def initialize(config)
  @data = {}
  @max_keys = config[:max_cache_keys] || DEFAULT_MAX_KEYS
  @lock = Mutex.new
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



8
9
10
 
# File 'lib/device_detector/memory_cache.rb', line 8

def data
  @data
end

#max_keys ⇒ Object (readonly)

Returns the value of attribute max_keys.



8
9
10
 
# File 'lib/device_detector/memory_cache.rb', line 8

def max_keys
  @max_keys
end

Instance Method Details

#get(key) ⇒ Object 



27
28
29
30
 
# File 'lib/device_detector/memory_cache.rb', line 27

def get(key)
  value, _hit = get_hit(key)
  value
end

#get_or_set(key, value = nil) ⇒ Object 



32
33
34
35
36
37
38
39
40
 
# File 'lib/device_detector/memory_cache.rb', line 32

def get_or_set(key, value = nil)
  string_key = String(key)

  result, hit = get_hit(string_key)
  return result if hit

  value = yield if block_given?
  set(string_key, value)
end

#set(key, value) ⇒ Object 



17
18
19
20
21
22
23
24
25
 
# File 'lib/device_detector/memory_cache.rb', line 17

def set(key, value)
  lock.synchronize do
    purge_cache
    # convert nil values into symbol so we know a value is present
    cache_value = value.nil? ? STORES_NIL_VALUE : value
    data[String(key)] = cache_value
    value
  end
end