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types.go
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types.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package watchmanager
import (
"time"
"github.com/m3db/m3x/instrument"
"github.com/coreos/etcd/clientv3"
)
// WatchManager manages etcd watch on a key
type WatchManager interface {
// Watch watches the key forever until the CheckAndStopFn returns true
Watch(key string)
}
// UpdateFn is called when an event on the watch channel happens
type UpdateFn func(key string, events []*clientv3.Event) error
// TickAndStopFn is called every once a while
// to check and stop the watch if needed
type TickAndStopFn func(key string) bool
// Options are options for the etcd watch helper
type Options interface {
// Watcher is the etcd watcher
Watcher() clientv3.Watcher
// SetWatcher sets the Watcher
SetWatcher(w clientv3.Watcher) Options
// UpdateFn is the function called when a notification on a key is received
UpdateFn() UpdateFn
// SetUpdateFn sets the UpdateFn
SetUpdateFn(f UpdateFn) Options
// TickAndStopFn is the function called periodically to check if a watch should be stopped
TickAndStopFn() TickAndStopFn
// SetTickAndStopFn sets the TickAndStopFn
SetTickAndStopFn(f TickAndStopFn) Options
// WatchOptions is a set of options for the etcd watch
WatchOptions() []clientv3.OpOption
// SetWatchOptions sets the WatchOptions
SetWatchOptions(opts []clientv3.OpOption) Options
// WatchChanCheckInterval will be used to periodically check if a watch chan
// is no longer being subscribed and should be closed
WatchChanCheckInterval() time.Duration
// SetWatchChanCheckInterval sets the WatchChanCheckInterval
SetWatchChanCheckInterval(t time.Duration) Options
// WatchChanResetInterval is the delay before resetting the etcd watch chan
WatchChanResetInterval() time.Duration
// SetWatchChanResetInterval sets the WatchChanResetInterval
SetWatchChanResetInterval(t time.Duration) Options
// WatchChanInitTimeout is the timeout for a watchChan initialization
WatchChanInitTimeout() time.Duration
// SetWatchChanInitTimeout sets the WatchChanInitTimeout
SetWatchChanInitTimeout(t time.Duration) Options
// InstrumentsOptions is the instrument options
InstrumentsOptions() instrument.Options
// SetInstrumentsOptions sets the InstrumentsOptions
SetInstrumentsOptions(iopts instrument.Options) Options
// Validate validates the options
Validate() error
}