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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| package paychmgr | ||
|
|
||
| import "github.com/filecoin-project/go-address" | ||
|
|
||
| // accessorByFromTo gets a channel accessor for a given from / to pair. | ||
| // The channel accessor facilitates locking a channel so that operations | ||
| // must be performed sequentially on a channel (but can be performed at | ||
| // the same time on different channels). | ||
| func (pm *Manager) accessorByFromTo(from address.Address, to address.Address) (*channelAccessor, error) { | ||
| key := pm.accessorCacheKey(from, to) | ||
|
|
||
| // First take a read lock and check the cache | ||
| pm.lk.RLock() | ||
| ca, ok := pm.channels[key] | ||
| pm.lk.RUnlock() | ||
| if ok { | ||
| return ca, nil | ||
| } | ||
|
|
||
| // Not in cache, so take a write lock | ||
| pm.lk.Lock() | ||
| defer pm.lk.Unlock() | ||
|
|
||
| // Need to check cache again in case it was updated between releasing read | ||
| // lock and taking write lock | ||
| ca, ok = pm.channels[key] | ||
| if !ok { | ||
| // Not in cache, so create a new one and store in cache | ||
| ca = pm.addAccessorToCache(from, to) | ||
| } | ||
|
|
||
| return ca, nil | ||
| } | ||
|
|
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| // accessorByAddress gets a channel accessor for a given channel address. | ||
| // The channel accessor facilitates locking a channel so that operations | ||
| // must be performed sequentially on a channel (but can be performed at | ||
| // the same time on different channels). | ||
| func (pm *Manager) accessorByAddress(ch address.Address) (*channelAccessor, error) { | ||
| // Get the channel from / to | ||
| pm.lk.RLock() | ||
| channelInfo, err := pm.store.ByAddress(ch) | ||
| pm.lk.RUnlock() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // TODO: cache by channel address so we can get by address instead of using from / to | ||
| return pm.accessorByFromTo(channelInfo.Control, channelInfo.Target) | ||
| } | ||
|
|
||
| // accessorCacheKey returns the cache key use to reference a channel accessor | ||
| func (pm *Manager) accessorCacheKey(from address.Address, to address.Address) string { | ||
| return from.String() + "->" + to.String() | ||
| } | ||
|
|
||
| // addAccessorToCache adds a channel accessor to a cache. Note that channelInfo | ||
| // may be nil if the channel hasn't been created yet, but we still want to | ||
| // reference the same channel accessor for a given from/to, so that all | ||
| // attempts to access a channel use the same lock (the lock on the accessor) | ||
| func (pm *Manager) addAccessorToCache(from address.Address, to address.Address) *channelAccessor { | ||
| key := pm.accessorCacheKey(from, to) | ||
| ca := newChannelAccessor(pm) | ||
| // TODO: Use LRU | ||
| pm.channels[key] = ca | ||
| return ca | ||
| } |
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