// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 datacoord

import "sync"

var (
	buildIndexCh     chan UniqueID
	statsTaskCh      chan UniqueID
	buildIndexChOnce sync.Once
	statsTaskChOnce  sync.Once
)

func getBuildIndexChSingleton() chan UniqueID {
	buildIndexChOnce.Do(func() {
		buildIndexCh = make(chan UniqueID, 1024)
	})

	return buildIndexCh
}

func getStatsTaskChSingleton() chan UniqueID {
	statsTaskChOnce.Do(func() {
		statsTaskCh = make(chan UniqueID, 1024)
	})
	return statsTaskCh
}