| # Copyright 2015 gRPC authors. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| # GRPC contains the General RPC module. |
| module GRPC |
| # Notifier is useful high-level synchronization primitive. |
| class Notifier |
| attr_reader :payload, :notified |
| alias_method :notified?, :notified |
| |
| def initialize |
| @mutex = Mutex.new |
| @cvar = ConditionVariable.new |
| @notified = false |
| @payload = nil |
| end |
| |
| def wait |
| @mutex.synchronize do |
| @cvar.wait(@mutex) until notified? |
| end |
| end |
| |
| def notify(payload) |
| @mutex.synchronize do |
| return Error.new('already notified') if notified? |
| @payload = payload |
| @notified = true |
| @cvar.signal |
| return nil |
| end |
| end |
| end |
| end |