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56 lines
1.6 KiB
56 lines
1.6 KiB
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.quicksearchbox;
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import android.os.SystemClock;
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/**
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* Tracks latency in wall-clock time. Since {@link #getLatency} returns an {@code int},
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* latencies over 2^31 ms (~ 25 days) cannot be measured.
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* This class uses {@link SystemClock#uptimeMillis} which does not advance during deep sleep.
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*/
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public class LatencyTracker {
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/**
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* Start time, in milliseconds as returned by {@link SystemClock#uptimeMillis}.
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*/
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private long mStartTime;
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/**
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* Creates a new latency tracker and sets the start time.
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*/
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public LatencyTracker() {
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mStartTime = SystemClock.uptimeMillis();
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}
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/**
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* Resets the start time.
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*/
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public void reset() {
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mStartTime = SystemClock.uptimeMillis();
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}
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/**
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* Gets the number of milliseconds since the object was created, or {@link #reset} was called.
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*/
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public int getLatency() {
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long now = SystemClock.uptimeMillis();
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return (int) (now - mStartTime);
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}
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}
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