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50 lines
1.3 KiB
50 lines
1.3 KiB
package types
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// Interface assertions
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var _ TxEventPublisher = (*TxEventBuffer)(nil)
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// TxEventBuffer is a buffer of events, which uses a slice to temporarily store
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// events.
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type TxEventBuffer struct {
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next TxEventPublisher
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capacity int
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events []EventDataTx
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}
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// NewTxEventBuffer accepts a TxEventPublisher and returns a new buffer with the given
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// capacity.
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func NewTxEventBuffer(next TxEventPublisher, capacity int) *TxEventBuffer {
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return &TxEventBuffer{
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next: next,
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capacity: capacity,
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events: make([]EventDataTx, 0, capacity),
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}
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}
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// Len returns the number of events cached.
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func (b TxEventBuffer) Len() int {
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return len(b.events)
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}
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// PublishEventTx buffers an event to be fired upon finality.
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func (b *TxEventBuffer) PublishEventTx(e EventDataTx) error {
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b.events = append(b.events, e)
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return nil
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}
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// Flush publishes events by running next.PublishWithTags on all cached events.
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// Blocks. Clears cached events.
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func (b *TxEventBuffer) Flush() error {
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for _, e := range b.events {
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err := b.next.PublishEventTx(e)
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if err != nil {
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return err
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}
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}
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// Clear out the elements and set the length to 0
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// but maintain the underlying slice's capacity.
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// See Issue https://github.com/tendermint/tendermint/issues/1189
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b.events = b.events[:0]
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return nil
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}
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