source: geniuswebcore/geniusweb/progress/ProgressTime.py

from datetime import datetime

from geniusweb.progress.Progress import Progress


class ProgressTime (Progress):
        '''
        keeps track of progress towards the Deadline and the time/rounds left.
        immutable. However, the time progresses nevertheless since this refers to the
        system clocks. immutable.
        '''

        def __init__(self, duration: int, start:datetime):
                '''
                @param d     the duration, eg {@link DeadlineTime#getDuration()}. Must be
                             > 0.
                @param start the start Date (unix time in millisecs since 1970). See
                             {@link System#currentTimeMillis()}. WARNING
                             due to a bug in python for windows, this value must be 
                             at least 100000 seconds above jan. 1, 1970.
                '''
                self._start = start;
                self._duration = 1 if duration == None or duration <= 0 else duration

        def get(self, currentTimeMs:int) -> float:
                delta = currentTimeMs - 1000 * datetime.timestamp(self._start);
                # double should have ~53 digits of precision, and we're computing
                # deltas here.
                # 2^53 millis seems plenty for our purposes so no need to use
                # BigDecimal here.
                ratio:float = delta / self._duration;
                if ratio > 1:
                        ratio = 1
                elif ratio < 0:
                        ratio = 0
                return ratio

        def isPastDeadline(self, currentTimeMs:int) -> bool:
                return currentTimeMs > int(datetime.timestamp(self._start) * 1000) + self._duration;

        def getStart(self) -> datetime:
                '''
                @return time measured in milliseconds, between the start time and
                        midnight, January 1, 1970 UTCas returned from
                        {@link System#currentTimeMillis()}
                '''
                return self._start;

        def getDuration(self) -> int:
                '''
                @return duration in milliseconds.
                '''
                return self._duration;

        def getTerminationTime(self) -> datetime:
                return datetime.fromtimestamp((int(datetime.timestamp(self._start) * 1000) + self._duration) / 1000.);

        def __repr__(self):
                return "ProgressTime[" + str(int(1000 * datetime.timestamp(self._start))) + " , " + str(self._duration) + "ms]"

        def __hash__(self):
                return hash((self._duration, self._start))

        def __eq__(self, other):
                return isinstance(other, self.__class__) \
                        and self._duration == other._duration \
                        and self._start == other._start