harness-drone/core/pubsub.go

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// Copyright 2019 Drone IO, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package core
import "context"
// Message defines a build change.
type Message struct {
Repository string
Visibility string
Data []byte
}
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// Pubsub provides publish subscriber capabilities, distributing
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// messages from multiple publishers to multiple subscribers.
type Pubsub interface {
// Publish publishes the message to all subscribers.
Publish(context.Context, *Message) error
// Subscribe subscribes to the message broker.
Subscribe(context.Context) (<-chan *Message, <-chan error)
// Subscribers returns a count of subscribers.
Subscribers() int
}