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39 lines
899 B
39 lines
899 B
package event
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import (
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"context"
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)
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// Message is an absctraction for all messages that
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// are sent to quque or received from queue.
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type Message struct {
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Key string
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Value []byte
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Header map[string]string
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}
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// Event given to a subscription handler for processing.
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type Event interface {
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Message() *Message
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Ack() error
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Nack() error
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}
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// Handler is a callback function that processes messages delivered
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// to asynchronous subscribers.
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type Handler func(context.Context, Event) error
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// Publisher is absctraction for sending messages
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// to queue.
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type Publisher interface {
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Publish(ctx context.Context, msg *Message) error
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PublishAsync(ctx context.Context, msg *Message, callback func(err error)) error
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Close() error
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}
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// Subscriber is an absctraction for receiving messages
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// from queue.
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type Subscriber interface {
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Subscribe(ctx context.Context, h Handler) error
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Close() error
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}
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