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// Copyright 2019 Google LLC. All Rights Reserved.
//
// 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 schedule provides support for periodically running a function.
package schedule
import (
"context"
"time"
)
// Every will call f periodically.
// The first call will be made immediately.
// Calls are made synchronously, so f will not be executed concurrently.
func Every(ctx context.Context, period time.Duration, f func(context.Context)) {
if ctx.Err() != nil {
return
}
// Run f immediately, then periodically call it again.
t := time.NewTicker(period)
defer t.Stop()
f(ctx)
for {
select {
case <-t.C:
f(ctx)
case <-ctx.Done():
return
}
}
}
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