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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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81 lines
2.6 KiB
81 lines
2.6 KiB
/* |
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* |
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* Copyright 2015 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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/// An Alarm posts the user provided tag to its associated completion queue upon |
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/// expiry or cancellation. |
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#ifndef GRPCXX_ALARM_H |
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#define GRPCXX_ALARM_H |
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#include <grpc++/impl/codegen/completion_queue.h> |
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#include <grpc++/impl/codegen/completion_queue_tag.h> |
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#include <grpc++/impl/codegen/grpc_library.h> |
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#include <grpc++/impl/codegen/time.h> |
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#include <grpc++/impl/grpc_library.h> |
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#include <grpc/grpc.h> |
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struct grpc_alarm; |
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namespace grpc { |
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class CompletionQueue; |
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/// A thin wrapper around \a grpc_alarm (see / \a / src/core/surface/alarm.h). |
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class Alarm : private GrpcLibraryCodegen { |
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public: |
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/// Create a completion queue alarm instance associated to \a cq. |
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/// |
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/// Once the alarm expires (at \a deadline) or it's cancelled (see \a Cancel), |
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/// an event with tag \a tag will be added to \a cq. If the alarm expired, the |
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/// event's success bit will be true, false otherwise (ie, upon cancellation). |
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/// \internal We rely on the presence of \a cq for grpc initialization. If \a |
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/// cq were ever to be removed, a reference to a static |
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/// internal::GrpcLibraryInitializer instance would need to be introduced |
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/// here. \endinternal. |
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template <typename T> |
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Alarm(CompletionQueue* cq, const T& deadline, void* tag) |
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: tag_(tag), |
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alarm_(grpc_alarm_create(cq->cq(), TimePoint<T>(deadline).raw_time(), |
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static_cast<void*>(&tag_))) {} |
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/// Destroy the given completion queue alarm, cancelling it in the process. |
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~Alarm() { grpc_alarm_destroy(alarm_); } |
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/// Cancel a completion queue alarm. Calling this function over an alarm that |
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/// has already fired has no effect. |
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void Cancel() { grpc_alarm_cancel(alarm_); } |
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private: |
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class AlarmEntry : public CompletionQueueTag { |
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public: |
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AlarmEntry(void* tag) : tag_(tag) {} |
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bool FinalizeResult(void** tag, bool* status) override { |
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*tag = tag_; |
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return true; |
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} |
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private: |
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void* tag_; |
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}; |
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AlarmEntry tag_; |
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grpc_alarm* const alarm_; // owned |
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}; |
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} // namespace grpc |
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#endif // GRPCXX_ALARM_H
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