| java.lang.Object | |
| ↳ | com.facebook.common.time.AwakeTimeSinceBootClock |
Class Overview
A clock that returns number of milliseconds since boot. It guarantees that every next call to now() will return a value that is not less that was returned from previous call to now(). This happens regardless system time changes, time zone changes, daylight saving changes etc.
DO USE THIS CLOCK FOR PERFORMANCE MEASUREMENT. IT STOPS TICKING WHILE THE DEVICE SLEEPS, THAT IS, WHILE THE DEVICE CANNOT RUN THE CODE WE ARE PURPORTEDLY MEASURING.
Summary
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| static AwakeTimeSinceBootClock |
get()
Returns a singleton instance of this clock.
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| long |
now()
Produce a timestamp.
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| long |
nowNanos()
Produce a timestamp.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
com.facebook.common.time.MonotonicClock
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From interface
com.facebook.common.time.MonotonicNanoClock
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Public Methods
public static AwakeTimeSinceBootClock get ()
Returns a singleton instance of this clock.
Returns
- singleton instance
public long now ()
Produce a timestamp. Values returned from this method may only be compared to other values returned from this clock in this process. They have no meaning outside of this process and should not be written to disk.
The difference between two timestamps is an interval, in milliseconds.
Returns
- A timestamp for the current time, in ms.
public long nowNanos ()
Produce a timestamp. Values returned from this method may only be compared to other values returned from this clock in this process. They have no meaning outside of this process and should not be written to disk.
The difference between two timestamps is an interval, in nanoseconds.
Returns
- A timestamp for the current time, in nanoseconds.