Module: CurlyMustache::Locking::ClassMethods

Defined in:
lib/curly_mustache/locking.rb

Instance Method Summary collapse

Instance Method Details

#do_locked_block(id, record, &block) ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 44

def do_locked_block(id, record, &block)
  yield(record)
rescue Exception
  raise
ensure
  unlock(id)
end

#lock(id, timeout = nil) ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 13

def lock(id, timeout = nil)
  if timeout.nil?
    connection.lock(lock_key(id))
  else
    lock_with_timeout(id, timeout)
  end
end

#lock_and_find(id, timeout = nil, &block) ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 34

def lock_and_find(id, timeout = nil, &block)
  lock(id, timeout) or return false
  unlock(id) and return if (record = find(id)).blank?
  if block_given?
    do_locked_block(id, record, &block)
  else
    record
  end
end

#lock_key(id) ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 52

def lock_key(id)
  "#{lock_prefix}:#{id_to_key(id)}"
end

#lock_prefix ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 56

def lock_prefix
  "lock"
end

#lock_with_timeout(id, timeout) ⇒ Object

Raises:

  • (Timeout::Error) 


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# File 'lib/curly_mustache/locking.rb', line 21

def lock_with_timeout(id, timeout)
  start_time = Time.now
  while (Time.now.to_f - start_time.to_f) < timeout
    connection.lock(lock_key(id)) and return true
    sleep(0.1)
  end
  raise Timeout::Error, "aquiring lock for #{id_to_key(id)}"
end

#unlock(id) ⇒ Object 



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# File 'lib/curly_mustache/locking.rb', line 30

def unlock(id)
  connection.unlock(lock_key(id))
end