CommonPromiseMixin< P > Struct Template Reference

Mixin for wrapping calls to common promise methods. More...

#include <Promise.hpp>

Public Member Functions
bool	isDone () const
	Returns true when computation has completed normally, or exceptionally, or was cancelled.
bool	hasResult () const
	Returns true when computation has completed normally.
bool	hasException () const
	Returns true when computation has completed exceptionally or was cancelled.
bool	isCancelled () const
	Returns true when computation was cancelled.
JavaException	getException () const
	Returns exceptional outcome of computation.
bool	awaitWithoutException (std::int32_t timeoutInMilliseconds) const
	Wait for computation to complete or timeout or throw an exception in case of exceptional completion.
bool	awaitWithoutException (const std::chrono::milliseconds &timeoutInMilliseconds) const
	Wait for computation to complete or timeout or throw an exception in case of exceptional completion.
void	cancel () const
	Cancels computation.

Detailed Description

template<typename P>
struct CommonPromiseMixin< P >

Mixin for wrapping calls to common promise methods.

Template Parameters

P	The promise type

Member Function Documentation

awaitWithoutException() [1/2]

template<typename P>

bool CommonPromiseMixin< P >::awaitWithoutException ( const std::chrono::milliseconds & timeoutInMilliseconds ) const

inline

Wait for computation to complete or timeout or throw an exception in case of exceptional completion.

If the wait is interrupted, then the computation is cancelled, the interruption flag on the current thread is set, and "CancellationException" is thrown.

If the wait times out, then the computation is cancelled and this method returns false. Use this method in the code that shall continue normal execution in case of timeout.

Parameters

timeoutInMilliseconds

The timeout.

Returns

true if the computation has completed normally; false when wait timed out.

Exceptions

CancellationException	if computation was cancelled.
PromiseException	if computation has completed exceptionally.

awaitWithoutException() [2/2]

template<typename P>

bool CommonPromiseMixin< P >::awaitWithoutException ( std::int32_t timeoutInMilliseconds ) const

inline

Wait for computation to complete or timeout or throw an exception in case of exceptional completion.

If the wait is interrupted, then the computation is cancelled, the interruption flag on the current thread is set, and "CancellationException" is thrown.

If the wait times out, then the computation is cancelled and this method returns false. Use this method in the code that shall continue normal execution in case of timeout.

Parameters

timeoutInMilliseconds

The timeout.

Returns

true if the computation has completed normally; false when wait timed out.

Exceptions

CancellationException	if computation was cancelled.
PromiseException	if computation has completed exceptionally.

cancel()

template<typename P>

void CommonPromiseMixin< P >::cancel ( ) const

inline

Cancels computation.

This method does nothing if computation has already completed.

If cancelled, then getException() will return "CancellationException", isDone, isCancelled, and hasException will return true, all handlers that were installed with whenDone method are notified by invoking their promiseDone method, and all waiters on join method throw "CancellationException".

getException()

template<typename P>

JavaException CommonPromiseMixin< P >::getException ( ) const

inline

Returns exceptional outcome of computation.

If computation has no hasException() exception, then this method returns an exception with a message "null". If computation has completed exceptionally or was cancelled, then the result of this method is not an exception with a message "null". If computation was cancelled, then this method returns "an instance of CancellationException".

Returns

exceptional outcome of computation.

See also

hasException()

hasException()

template<typename P>

bool CommonPromiseMixin< P >::hasException ( ) const

inline

Returns true when computation has completed exceptionally or was cancelled.

Use getException() method to get the exceptional outcome of the computation.

Returns

true when computation has completed exceptionally or was cancelled.

hasResult()

template<typename P>

bool CommonPromiseMixin< P >::hasResult ( ) const

inline

Returns true when computation has completed normally.

Use ::getResult() method to get the result of the computation.

Returns

true when computation has completed normally.

See also

::getResult()

isCancelled()

template<typename P>

bool CommonPromiseMixin< P >::isCancelled ( ) const

inline

Returns true when computation was cancelled.

Use getException() method to get the corresponding CancellationException.

Returns

true when computation was cancelled.

See also

getException()

isDone()

template<typename P>

bool CommonPromiseMixin< P >::isDone ( ) const

inline

Returns true when computation has completed normally, or exceptionally, or was cancelled.

Returns

true when computation has completed.