| /* |
| * Copyright (C) 2022 The Android Open Source Project |
| * |
| * 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 com.android.quicksearchbox |
| |
| import android.os.SystemClock |
| |
| /** |
| * Tracks latency in wall-clock time. Since [.getLatency] returns an `int`, latencies over 2^31 ms |
| * (~ 25 days) cannot be measured. This class uses [SystemClock.uptimeMillis] which does not advance |
| * during deep sleep. |
| */ |
| class LatencyTracker { |
| /** Start time, in milliseconds as returned by [SystemClock.uptimeMillis]. */ |
| private var mStartTime: Long |
| |
| /** Resets the start time. */ |
| fun reset() { |
| mStartTime = SystemClock.uptimeMillis() |
| } |
| |
| /** Gets the number of milliseconds since the object was created, or [.reset] was called. */ |
| val latency: Int |
| get() { |
| val now: Long = SystemClock.uptimeMillis() |
| return (now - mStartTime).toInt() |
| } |
| |
| /** Creates a new latency tracker and sets the start time. */ |
| init { |
| mStartTime = SystemClock.uptimeMillis() |
| } |
| } |