Class: Hyrax::LockManager

Inherits:
Object
  • Object
show all
Defined in:
app/services/hyrax/lock_manager.rb

Defined Under Namespace

Classes: UnableToAcquireLockError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(time_to_live, retry_count, retry_delay) ⇒ LockManager

Returns a new instance of LockManager.

Parameters:

  • time_to_live (Fixnum)

    How long to hold the lock in milliseconds

  • retry_count (Fixnum)

    How many times to retry to acquire the lock before raising UnableToAcquireLockError

  • retry_delay (Fixnum)

    Maximum wait time in milliseconds before retrying. Wait time is a random value between 0 and retry_delay.


11
12
13
14
# File 'app/services/hyrax/lock_manager.rb', line 11

def initialize(time_to_live, retry_count, retry_delay)
  @ttl = time_to_live
  @client = Redlock::Client.new([Redis.current], retry_count: retry_count, retry_delay: retry_delay)
end

Instance Attribute Details

#clientObject (readonly)

Returns the value of attribute client


6
7
8
# File 'app/services/hyrax/lock_manager.rb', line 6

def client
  @client
end

Instance Method Details

#lock(key) ⇒ Object

Blocks until lock is acquired or timeout.


17
18
19
20
21
22
23
24
# File 'app/services/hyrax/lock_manager.rb', line 17

def lock(key)
  returned_from_block = nil
  client.lock(key, @ttl) do |locked|
    raise UnableToAcquireLockError unless locked
    returned_from_block = yield
  end
  returned_from_block
end