![]() Hence, we need to guarantee we either mark a record as processed or delete it. Since we can run the same Timer multiple times, we need to be sure we’re not processing over and over the same records. Also, by using Update or Inserts in advanced queries instead of the entity actions, we speed up the process a bit. But since this method uses batches, all we need to do is ensure that we grab a small enough batch from the database, and that way, we guarantee we do not hit that timeout. Alternatively you may consider server-initiated updates, see WApplication::enableUpdates().If we’re close to the timeout, we wake the Timer again avoiding a timeout.Īnother way our Timer can reach a timeout is on the database transactions (default 30s). Timers are one way to provide updates of a web page without the user generating an event. If you want to create a timer outside the Wt event loop, take a look at asio deadline_timer or steady_timer. In clients without (enabled) JavaScript support, the minimum resolution of the timer is one second (1000 milli-seconds), and it is probably wise to use timers sparingly.Ī WTimer is only usable inside of a Wt event loop. ![]() When connecting stateless slot implementations to the timeout signal, these stateless slot implementations will be used as for any other signal (when Ajax is available). There is also a convience static method singleShot(). To create a timer that will fire only once, use setSingleShot(). ![]() An active timer may be cancelled at any time using stop().īy default, a timer will continue to generate events until you stop() it. To use a timer, create a WTimer instance, set the timer interval using setInterval() and connect a slot to the timeout signal. More.Ī utility class which provides timer signals and single-shot timers. Protected Member Functions inherited from Wt::WObject Typedef for a WObject method without arguments. This static function calls a function after a given time interval. SingleShot (std::chrono::milliseconds interval, const F &f) This static function calls a slot after a given time interval. SingleShot (std::chrono::milliseconds interval, T *receiver, void(V::*method)()) Protects a function against object destruction. More.īindSafe (const Function &function) noexcept Protects a const method call against object destruction. More.īindSafe (void(C::*method)(Args.) const) const noexcept Protects a method call against object destruction. Public Member Functions inherited from Wt::Core::observableīindSafe (void(C::*method)(Args.)) noexcept Provides a JavaScript implementation for a method. ImplementJavaScript (void(T::*method)(), const std::string &jsCode) Marks the current function as not stateless. ImplementStateless (void(T::*method)(), void(T::*undoMethod)())ĭeclares a slot to be stateless and learn client-side behaviour in advance. More.ĭeclares a slot to be stateless and learn client-side behaviour on first invocation. Resets a learned stateless slot implementation. Resets learned stateless slot implementations. Returns the (unique) identifier for this object. Remove a child WObject, so its lifetime is no longer determined by this WObject. Public Member Functions inherited from Wt::WObjectĪdd a child WObject whose lifetime is determined by this WObject.Īdd a child WObject, returning a raw pointer. ![]() SetInterval (std::chrono::milliseconds interval)Ĭonfigures this timer to fire only once. Ĭonstruct a new timer with the given parent. This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.
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