plasma软件更新工具的更新逻辑

每小时触发一次检查

Timer {
    id: timer
    repeat: true
    triggeredOnStart: true
    interval: 1000 * 60 * 60; // 1 hour
    onTriggered: {
        if (needsForcedUpdate() && networkAllowed && batteryAllowed) {
            PkUpdates.checkUpdates(true /* force */, false /* manual */);
        }
    }
}

比较上一次更新所过去的秒数

function needsForcedUpdate() {
    var secs = (Date.now() - PkUpdates.lastRefreshTimestamp())/1000; // compare with the saved timestamp
    if (secs < 0) { // never checked before
        return true;
    } else if (checkDaily) {
        return secs >= secsInDay;
    } else if (checkWeekly) {
        return secs >= secsInWeek;
    } else if (checkMonthly) {
        return secs >= secsInMonth;
    }
    return false;
}

相关源码