Class: Awssh::Cache

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file, expires) ⇒ Cache

Returns a new instance of Cache.



18
19
20
21
22
23
24
25
26
27
 
# File 'lib/awssh/cache.rb', line 18

def initialize(file, expires)
  if file
    @file = File.expand_path(file)
  else
    @disabled = true
    @file = nil
  end
  @expires = expires
  @data = load
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



16
17
18
 
# File 'lib/awssh/cache.rb', line 16

def data
  @data
end

Class Method Details

.instance ⇒ Object 



10
11
12
13
 
# File 'lib/awssh/cache.rb', line 10

def instance
  raise 'cache not loaded?' unless @instance.data
  @instance
end

.load(file) ⇒ Object 



6
7
8
 
# File 'lib/awssh/cache.rb', line 6

def load(file)
  @instance = new(file)
end

Instance Method Details

#fetch(key, force) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/awssh/cache.rb', line 40

def fetch(key, force)
  if force || @disabled
    diff = Time.now.to_i
  else
    time = @data[key] ? @data[key][:time] : 0
    diff = Time.now.to_i - time
  end
  if diff > @expires
    value = yield
    write(key, value)
    return value
  else
    read(key)
  end
end

#read(key) ⇒ Object 



36
37
38
 
# File 'lib/awssh/cache.rb', line 36

def read(key)
  @data[key][:value]
end

#write(key, value) ⇒ Object 



29
30
31
32
33
34
 
# File 'lib/awssh/cache.rb', line 29

def write(key, value)
  time = Time.now.to_i
  data = {time: time, value: value}
  @data[key] = data
  save
end