harness-drone/pubsub/sub.go

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2019-02-19 23:56:41 +00:00
// 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 pubsub
import (
"sync"
"github.com/drone/drone/core"
)
type subscriber struct {
sync.Mutex
handler chan *core.Message
quit chan struct{}
done bool
}
func (s *subscriber) publish(event *core.Message) {
select {
case <-s.quit:
case s.handler <- event:
default:
// events are sent on a buffered channel. If there
// is a slow consumer that is not processing events,
// the buffered channel will fill and newer messages
// are ignored.
}
}
func (s *subscriber) close() {
s.Lock()
if s.done == false {
close(s.quit)
s.done = true
}
s.Unlock()
}