Implement Update method #134
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Thanks for the issue and PR. I have a similar use case.
I have a couple of suggestions, which combined will:
- Pass
existstoUpdateCbto allow distinguishing between zero-values and non-existent ones. This is also consistent withUpsert,RemoveCb - Allow
UpdateCbto cancel the update if needed.Updatewould return the final value and a bool to indicate whether the update went through.
concurrent_map.go
Outdated
| // It is called while lock is held, therefore it MUST NOT | ||
| // try to access other keys in same map, as it can lead to deadlock since | ||
| // Go sync.RWLock is not reentrant | ||
| type UpdateCb[V any] func(valueInMap V) V |
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Suggested change
| type UpdateCb[V any] func(valueInMap V) V | |
| type UpdateCb[V any] func(exists bool, valueInMap V) (newVal V, ok bool) |
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| // Update an existing element using UpdateCb, assuming the key exists. | ||
| // If it does not, the zero value for the value type is passed to the callback. | ||
| func (m ConcurrentMap[K, V]) Update(key K, cb UpdateCb[V]) (res V) { |
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Suggested change
| func (m ConcurrentMap[K, V]) Update(key K, cb UpdateCb[V]) (res V) { | |
| func (m ConcurrentMap[K, V]) Update(key K, cb UpdateCb[V]) (res V, ok bool) { |
The update method allows atomically mutating a value in the map. If the key does not exist, the zero value for the value type is mutated and saved.
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Thanks for the suggestion @ayushjain2809 , updated accordingly. |
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The update method allows atomically mutating a value in the map. If the key does not exist, the zero value for the value type is mutated and saved.
Fixes #133