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// Copyright 2014 The LUCI 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 clock is an interface to system time and timers which is easy to
// test.
package clock
import (
"context"
"time"
)
// Clock is an interface to system time.
//
// The standard clock is SystemClock, which falls through to the system time
// library. Another clock, FakeClock, is available to simulate time facilities
// for testing.
type Clock interface {
// Returns the current time (see time.Now).
Now() time.Time
// Sleeps the current goroutine (see time.Sleep).
//
// Sleep will return a TimerResult containing the time when it was awakened
// and detailing its execution. If the sleep terminated prematurely from
// cancellation, the TimerResult's Incomplete() method will return true.
Sleep(context.Context, time.Duration) TimerResult
// Creates a new Timer instance, bound to this Clock.
//
// If the supplied Context is canceled, the timer will expire immediately.
NewTimer(c context.Context) Timer
}