Php/docs/class.evperiodic
(PECL ev >= 0.2.0)
简介
Periodic watchers are also timers of a kind, but they are very versatile.
Unlike EvTimer , EvPeriodic watchers are not based on real time(or relative time, the physical time that passes) but on wall clock time(absolute time, calendar or clock). The difference is that wall clock time can run faster or slower than real time, and time jumps are not uncommon(e.g. when adjusting it).
EvPeriodic
watcher can be configured to trigger after some specific point in time.
For example, if an
EvPeriodic
watcher is configured to trigger
"in 10 seconds"
(e.g.
EvLoop::now()
+
10.0
, i.e. an absolute time, not a delay), and the system clock is reset to
January of the previous year
, then it will take a year or more to trigger the event (unlike an
EvTimer
, which would still trigger roughly
10
seconds after starting it as it uses a relative timeout).
As with timers, the callback is guaranteed to be invoked only when the point in time where it is supposed to trigger has passed. If multiple timers become ready during the same loop iteration then the ones with earlier time-out values are invoked before ones with later time-out values (but this is no longer true when a callback calls EvLoop::run() recursively).
类摘要
EvPeriodic extends EvWatcher {
public
$offset
public
$interval
/* 继承的属性 */
public
$is_active
public
$data
public
$is_pending
public
$priority
/* 方法 */
public again ( ) : void
public at ( ) : float
public
__construct
(
float
$offset
,
string
$interval
,
callable
$reschedule_cb
,
callable
$callback
[,
mixed
$data
= null
[,
int
$priority
= 0
]] )
final
public
static
createStopped
(
float
$offset
,
float
$interval
,
callable
$reschedule_cb
,
callable
$callback
[,
mixed
$data
= null
[,
int
$priority
= 0
]] ) : EvPeriodic
public
set
(
float
$offset
,
float
$interval
) : void
/* 继承的方法 */
public EvWatcher::clear ( ) : int
abstract public EvWatcher::__construct ( )
public
EvWatcher::feed
(
int
$revents
) : void
public EvWatcher::getLoop ( ) : EvLoop
public
EvWatcher::invoke
(
int
$revents
) : void
public
EvWatcher::keepalive
([
bool
$value
] ) : bool
public
EvWatcher::setCallback
(
callable
$callback
) : void
public EvWatcher::start ( ) : void
public EvWatcher::stop ( ) : void
}
属性
offset- When repeating, this contains the offset value, otherwise this is the absolute point in time(the offset value passed to EvPeriodic::set() , although libev might modify this value for better numerical stability).
interval- The current interval value. Can be modified any time, but changes only take effect when the periodic timer fires or EvPeriodic::again() is being called.
Table of Contents
- EvPeriodic::again — Simply stops and restarts the periodic watcher again
- EvPeriodic::at — Returns the absolute time that this watcher is supposed to trigger next
- EvPeriodic::__construct — Constructs EvPeriodic watcher object
- EvPeriodic::createStopped — Create a stopped EvPeriodic watcher
- EvPeriodic::set — Configures the watcher
/* 属性 */