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# 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
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