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39 lines
1.0 KiB
39 lines
1.0 KiB
package events
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import "context"
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// An EventCache buffers events for a Fireable
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// All events are cached. Filtering happens on Flush
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type EventCache struct {
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evsw Fireable
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events []eventInfo
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}
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// Create a new EventCache with an EventSwitch as backend
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func NewEventCache(evsw Fireable) *EventCache {
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return &EventCache{
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evsw: evsw,
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}
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}
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// a cached event
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type eventInfo struct {
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event string
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data EventData
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}
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// Cache an event to be fired upon finality.
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func (evc *EventCache) FireEvent(event string, data EventData) {
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// append to list (go will grow our backing array exponentially)
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evc.events = append(evc.events, eventInfo{event, data})
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}
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// Fire events by running evsw.FireEvent on all cached events. Blocks.
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// Clears cached events
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func (evc *EventCache) Flush(ctx context.Context) {
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for _, ei := range evc.events {
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evc.evsw.FireEvent(ctx, ei.event, ei.data)
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}
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// Clear the buffer, since we only add to it with append it's safe to just set it to nil and maybe safe an allocation
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evc.events = nil
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}
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