Class: Lock
- Inherits:
-
ActiveRecord::Base
- Object
- ActiveRecord::Base
- Lock
- Defined in:
- app/models/lock.rb
Class Method Summary collapse
-
.get(name, args = {}) ⇒ Object
Get an atomic lock if value matches or is nil.
-
.get_value(name) ⇒ Object
Return value of a lock.
-
.release(names, args = {}) ⇒ Object
Release an atomic lock if value matches or is nil.
-
.release_all ⇒ Object
Destroy all locks in one atomic operation.
-
.release_for_task(task) ⇒ Object
Release all locks for a given task.
Class Method Details
.get(name, args = {}) ⇒ Object
Get an atomic lock if value matches or is nil. Block until lock was successful if args was set to true
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# File 'app/models/lock.rb', line 4 def self.get name, args = {} poll_time = args[:poll_time] || 10 until (lock = get_lock_for(name, args)) || args[:blocking] != true do sleep poll_time end lock end |
.get_value(name) ⇒ Object
Return value of a lock. When no lock was found, nil will be returned.
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# File 'app/models/lock.rb', line 48 def self.get_value name lock = self.where(:name => name).first if lock lock.value.nil? ? '' : lock.value else nil end end |
.release(names, args = {}) ⇒ Object
Release an atomic lock if value matches or is nil
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# File 'app/models/lock.rb', line 14 def self.release names, args = {} successful = false if name # If names is a single string, transorm it to an array names = [names.to_s] if names.class == String || names.class == Symbol self.transaction do locks = self.where(:name => names).lock(true).all unless locks.blank? successful = true # Check, if the value of every selected lock matches the args[:value] unless no args[:value] was specified locks.each{ |l| successful = false unless (args[:value].nil? || (args[:value] != nil && args[:value] == l.value)) } # Now destroy the locks, if it is successful locks.each{ |l| l.destroy } if successful end end end successful end |
.release_all ⇒ Object
Destroy all locks in one atomic operation
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# File 'app/models/lock.rb', line 59 def self.release_all self.transaction do self.all.each { |l| l.destroy } end end |
.release_for_task(task) ⇒ Object
Release all locks for a given task. This is only working, if the value was set to “task #tasktask.id”
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# File 'app/models/lock.rb', line 39 def self.release_for_task task self.transaction do locks = self.where(:value => "task #{task.id}").lock(true).all locks.each{ |l| l.destroy } end end |