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// Copyright 2016 The etcd Authors
//
// 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 grpcproxy
import (
"sync"
)
// watchRanges tracks all open watches for the proxy.
type watchRanges struct {
wp *watchProxy
mu sync.Mutex
bcasts map[watchRange]*watchBroadcasts
}
func newWatchRanges(wp *watchProxy) *watchRanges {
return &watchRanges{
wp: wp,
bcasts: make(map[watchRange]*watchBroadcasts),
}
}
func (wrs *watchRanges) add(w *watcher) {
wrs.mu.Lock()
defer wrs.mu.Unlock()
if wbs := wrs.bcasts[w.wr]; wbs != nil {
wbs.add(w)
return
}
wbs := newWatchBroadcasts(wrs.wp)
wrs.bcasts[w.wr] = wbs
wbs.add(w)
}
func (wrs *watchRanges) delete(w *watcher) {
wrs.mu.Lock()
defer wrs.mu.Unlock()
wbs, ok := wrs.bcasts[w.wr]
if !ok {
panic("deleting missing range")
}
if wbs.delete(w) == 0 {
wbs.stop()
delete(wrs.bcasts, w.wr)
}
}
func (wrs *watchRanges) stop() {
wrs.mu.Lock()
defer wrs.mu.Unlock()
for _, wb := range wrs.bcasts {
wb.stop()
}
wrs.bcasts = nil
}
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