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func newCache(cfg config.GdmCacheConfig, | |
pf func(from, to geometry.Coordinate) (durationDistancePair, error)) *Cache { | |
res := Cache{ | |
cacheItems: make(map[string]gdmCacheItem), | |
ttlSec: cfg.CacheItemTTLSec, | |
invalidatePeriodSec: cfg.InvalidationPeriodSec, | |
pfGetP2PDurationAndDistance: pf, | |
} | |
return &res | |
} | |
func (c *Cache) get(from, to geometry.Coordinate) (gdmCacheItem, bool) { | |
c.mut.RLock() | |
defer c.mut.RUnlock() | |
keyStr := geometry.EncodeRawCoordinates([]geometry.Coordinate{from, to}) | |
val, exist := c.cacheItems[keyStr] | |
if exist { | |
return val, exist | |
} | |
itemsWithToEq := make([]gdmCacheItem, 0, len(c.cacheItems)) | |
for _, v := range c.cacheItems { | |
if v.to == to { | |
itemsWithToEq = append(itemsWithToEq, v) | |
} | |
} | |
for _, itwt := range itemsWithToEq { | |
p1 := geometry.Coordinate2Point(from) | |
p2 := geometry.Coordinate2Point(itwt.from) | |
if c.geom.DistancePointToPoint(p1, p2) > 10.0 { | |
continue | |
} | |
return itwt, true | |
} | |
return gdmCacheItem{}, false | |
} | |
func (c *Cache) set(from, to geometry.Coordinate) (gdmCacheItem, error) { | |
keyStr := geometry.EncodeRawCoordinates([]geometry.Coordinate{from, to}) | |
c.mut.Lock() | |
defer c.mut.Unlock() | |
if v, ex := c.cacheItems[keyStr]; ex { | |
return v, nil | |
} | |
resp, err := c.pfGetP2PDurationAndDistance(from, to) | |
if err != nil { | |
return gdmCacheItem{}, err | |
} | |
neuItem := gdmCacheItem{ | |
from: from, | |
to: to, | |
data: durationDistancePair{ | |
dur: resp.dur, | |
distanceMeters: resp.distanceMeters}, | |
invalidationTime: time.Now().Add(time.Duration(c.ttlSec) * time.Second), | |
} | |
c.cacheItems[keyStr] = neuItem | |
return neuItem, nil | |
} | |
func (c *Cache) invalidate() { | |
c.mut.Lock() | |
defer c.mut.Unlock() | |
toDelete := make([]string, 0, len(c.cacheItems)) | |
for k, v := range c.cacheItems { | |
if time.Now().Before(v.invalidationTime) { | |
continue | |
} | |
toDelete = append(toDelete, k) | |
} | |
for _, td := range toDelete { | |
delete(c.cacheItems, td) | |
} | |
} | |
func (c *Cache) run() { | |
ticker := time.NewTicker(time.Duration(c.invalidatePeriodSec) * time.Second) | |
for { | |
select { | |
case <-ticker.C: | |
c.invalidate() | |
} | |
} | |
} |
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