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json_cache.go
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json_cache.go
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package bikage
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"sort"
"sync"
)
const cache_path = "./bikage_cache.json"
type JsonCache struct {
distances map[string]uint64
trips map[string]map[string]Trip
sync.RWMutex
}
func NewJsonCache() *JsonCache {
c := &JsonCache{
distances: make(map[string]uint64),
trips: make(map[string]map[string]Trip),
}
c.Lock()
c.deserialize()
c.Unlock()
return c
}
func (c *JsonCache) GetDistance(route Route) (uint64, bool) {
c.RLock()
distance, found := c.distances[make_key(route.From, route.To)]
c.RUnlock()
return distance, found
}
func (c *JsonCache) PutDistance(route Route, distance uint64) {
c.Lock()
c.distances[make_key(route.From, route.To)] = distance
c.serialize()
c.Unlock()
}
func (c *JsonCache) GetTrip(username, id string) (Trip, bool) {
c.RLock()
user_trips, found := c.trips[username]
c.RUnlock()
if !found {
return Trip{}, false
}
trip, found := user_trips[id]
return trip, found
}
func (c *JsonCache) GetTrips(username string) Trips {
trips := make(Trips, 0)
c.RLock()
user_trips, found := c.trips[username]
c.RUnlock()
if !found {
return trips
}
for _, trip := range user_trips {
trips = append(trips, trip)
}
sort.Sort(trips)
return trips
}
func (c *JsonCache) PutTrip(username string, trip Trip) {
c.Lock()
_, found := c.trips[username]
if !found {
c.trips[username] = make(map[string]Trip)
}
c.trips[username][trip.Id] = trip
c.serialize()
c.Unlock()
}
type serialized struct {
Distances map[string]uint64
Trips map[string]map[string]Trip
}
func (c *JsonCache) deserialize() {
data, err := ioutil.ReadFile(cache_path)
if err != nil {
log.Println("JsonCache READ error ->", err)
return
}
var cache serialized
json.Unmarshal(data, &cache)
c.distances = cache.Distances
c.trips = cache.Trips
}
func (c *JsonCache) serialize() {
cache := serialized{c.distances, c.trips}
data, err := json.MarshalIndent(cache, "", " ")
if err != nil {
log.Println("JsonCache MARSHALL error ->", err)
return
}
err = ioutil.WriteFile(cache_path, data, 0755)
if err != nil {
log.Println("JsonCache SERIALIZE error ->", err)
}
}
func make_key(from, to Station) string {
return fmt.Sprintf("%d,%d", from.Id, to.Id)
}