Class: Sufia::LockManager

Inherits:
Object
  • Object
show all
Defined in:
app/services/sufia/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.



14
15
16
17
 
# File 'app/services/sufia/lock_manager.rb', line 14

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

Instance Attribute Details

#client ⇒ Object (readonly)

TODO: This file is the same as curation_concerns/curation_concerns-models/app/services/curation_concerns/lock_manager.rb.

During the merge of Sufia to use Curation Concerns, this file may be replaced by the Curation Concerns version.



9
10
11
 
# File 'app/services/sufia/lock_manager.rb', line 9

def client
  @client
end

Instance Method Details

#lock(key) ⇒ Object

Blocks until lock is acquired or timeout.



20
21
22
23
24
25
26
27
 
# File 'app/services/sufia/lock_manager.rb', line 20

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