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/*
* Copyright (C) 2018 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.google.android.setupcompat.logging;
import android.util.Log;
import com.google.android.setupcompat.internal.ClockProvider;
import com.google.common.base.Preconditions;
/** Convenience utility to log duration events. Please note that this class is not thread-safe. */
public final class Timer {
/** Creates a new instance of timer for the given {@code metricKey}. */
public Timer(MetricKey metricKey) {
this.metricKey = metricKey;
}
/**
* Starts the timer and notes the current clock time.
*
* @throws IllegalStateException if the timer was stopped.
*/
public void start() {
Preconditions.checkState(!isStopped(), "Timer cannot be started once stopped.");
if (isStarted()) {
Log.wtf(
TAG,
String.format(
"Timer instance was already started for: %s at [%s].", metricKey, startInNanos));
return;
}
startInNanos = ClockProvider.timeInNanos();
}
/**
* Stops the watch and the current clock time is noted.
*
* @throws IllegalStateException if the watch was not started.
*/
public void stop() {
Preconditions.checkState(isStarted(), "Timer must be started before it can be stopped.");
if (isStopped()) {
Log.wtf(
TAG,
String.format(
"Timer instance was already stopped for: %s at [%s]", metricKey, stopInNanos));
return;
}
stopInNanos = ClockProvider.timeInNanos();
}
boolean isStopped() {
return stopInNanos != 0;
}
private boolean isStarted() {
return startInNanos != 0;
}
long getDurationInNanos() {
return stopInNanos - startInNanos;
}
MetricKey getMetricKey() {
return metricKey;
}
private long startInNanos;
private long stopInNanos;
private final MetricKey metricKey;
private static final String TAG = "SetupCompat.Timer";
}
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