agrpc::BasicAlarm< Executor > Class Template Reference

I/O object for grpc::Alarm More...

#include <agrpc/alarm.hpp>

Public Types
using	executor_type = Executor
	The executor type.

Public Member Functions
	BasicAlarm (const Executor &executor)
	Construct a BasicAlarm from an executor.
	BasicAlarm (agrpc::GrpcContext &grpc_context)
	Construct a BasicAlarm from a GrpcContext.
template<class Deadline , class CompletionToken = detail::DefaultCompletionTokenT<Executor>>
auto	wait (const Deadline &deadline, CompletionToken &&token=CompletionToken{}) &
	Wait until a specified deadline has been reached (lvalue overload) More...
template<class Deadline , class CompletionToken = detail::DefaultCompletionTokenT<Executor>>
auto	wait (const Deadline &deadline, CompletionToken &&token=CompletionToken{}) &&
	Wait until a specified deadline has been reached (rvalue overload) More...
void	cancel ()
	Cancel an outstanding wait. More...
const executor_type &	get_executor () const noexcept
	Get the executor. More...
const executor_type &	get_scheduler () const noexcept
	Get the scheduler. More...

Detailed Description

template<class Executor>
class agrpc::BasicAlarm< Executor >

I/O object for grpc::Alarm

Wraps a grpc::Alarm as an I/O object.

Template Parameters

Executor

The executor type, must be capable of referring to a agrpc::GrpcContext.

Per-Operation Cancellation

All. Effectively calls grpc::Alarm::Cancel which will cause the operation to complete with false.

Since

2.2.0

Member Function Documentation

wait() [1/2]

template<class Executor >

template<class Deadline , class CompletionToken = detail::DefaultCompletionTokenT<Executor>>

auto agrpc::BasicAlarm< Executor >::wait ( const Deadline &  deadline, CompletionToken &&  token = CompletionToken{}  ) &

inline

Wait until a specified deadline has been reached (lvalue overload)

The operation finishes once the alarm expires (at deadline) or is cancelled. If the alarm expired, the result will be true, false otherwise (i.e. upon cancellation).

Attention

Only one wait may be outstanding at a time.

Example:

    agrpc::Alarm alarm{grpc_context};
    bool wait_ok = co_await alarm.wait(std::chrono::system_clock::now() + std::chrono::seconds(1), asio::use_awaitable);

Parameters

deadline	By default gRPC supports two types of deadlines: gpr_timespec and std::chrono::system_clock::time_point. More types can be added by specializing grpc::TimePoint.
token	A completion token like asio::yield_context or the one created by agrpc::use_sender. The completion signature is void(bool). true if it expired, false if it was canceled.

wait() [2/2]

template<class Executor >

template<class Deadline , class CompletionToken = detail::DefaultCompletionTokenT<Executor>>

auto agrpc::BasicAlarm< Executor >::wait ( const Deadline &  deadline, CompletionToken &&  token = CompletionToken{}  ) &&

inline

Wait until a specified deadline has been reached (rvalue overload)

Extends the lifetime of the Alarm until the end of the wait. Otherwise, equivalent to the lvalue overload.

Example:

    auto [alarm, wait_ok] = co_await agrpc::Alarm(grpc_context)
                                .wait(std::chrono::system_clock::now() + std::chrono::seconds(1), asio::use_awaitable);

Parameters

token

A completion token like asio::yield_context or the one created by agrpc::use_sender. The completion signature is void(bool, BasicAlarm). true if it expired, false if it was canceled.

cancel()

template<class Executor >

void agrpc::BasicAlarm< Executor >::cancel ( )

inline

Cancel an outstanding wait.

The outstanding wait will complete with false if the Alarm did not fire yet, otherwise this function has no effect.

Thread-safe

get_executor()

template<class Executor >

const executor_type & agrpc::BasicAlarm< Executor >::get_executor ( ) const

inlinenoexcept

Get the executor.

Thread-safe

get_scheduler()

template<class Executor >

const executor_type & agrpc::BasicAlarm< Executor >::get_scheduler ( ) const

inlinenoexcept

Get the scheduler.

Thread-safe

Since

2.9.0