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Add mechanism to wait for items to be processed. #184

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merged 2 commits into from
Aug 24, 2020
Merged

Add mechanism to wait for items to be processed. #184

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9353cee
add wg
Feb 28, 2020
5d96a86
Merge remote-tracking branch 'origin/master' into wait
martinmr Aug 19, 2020
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15 changes: 15 additions & 0 deletions cache.go
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,7 @@ type Item struct {
Value interface{}
Cost int64
Expiration time.Time
wg *sync.WaitGroup
}

// NewCache returns a new Cache instance and any configuration errors, if any.
Expand Down Expand Up @@ -169,6 +170,16 @@ func NewCache(config *Config) (*Cache, error) {
return cache, nil
}

func (c *Cache) Wait() {
if c == nil {
return
}
wg := &sync.WaitGroup{}
wg.Add(1)
c.setBuf <- &Item{wg: wg}
wg.Wait()
}

// Get returns the value (if any) and a boolean representing whether the
// value was found or not. The value can be nil and the boolean can be true at
// the same time.
Expand Down Expand Up @@ -346,6 +357,10 @@ func (c *Cache) processItems() {
for {
select {
case i := <-c.setBuf:
if i.wg != nil {
i.wg.Done()
continue
}
// Calculate item cost value if new or update.
if i.Cost == 0 && c.cost != nil && i.flag != itemDelete {
i.Cost = c.cost(i.Value)
Expand Down