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/*
* 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.adservices.service.stats;
import android.adservices.common.CallerMetadata;
import android.annotation.NonNull;
import com.android.adservices.LogUtil;
import javax.annotation.concurrent.ThreadSafe;
/** Class for Api Service Latency Calculator. */
@ThreadSafe
public class ApiServiceLatencyCalculator {
private final long mBinderElapsedTimestamp;
private final long mStartElapsedTimestamp;
private volatile long mStopElapsedTimestamp;
private volatile boolean mRunning;
private final Clock mClock;
public ApiServiceLatencyCalculator(
@NonNull CallerMetadata callerMetadata, @NonNull Clock clock) {
mBinderElapsedTimestamp = callerMetadata.getBinderElapsedTimestamp();
mClock = clock;
mStartElapsedTimestamp = mClock.elapsedRealtime();
mRunning = true;
LogUtil.v("ApiServiceLatencyCalculator started.");
}
/**
* Stops a {@link ApiServiceLatencyCalculator} instance from time calculation. If an instance is
* not running, calling this method will do nothing.
*/
private void stop() {
if (!mRunning) {
return;
}
synchronized (this) {
if (!mRunning) {
return;
}
mStopElapsedTimestamp = mClock.elapsedRealtime();
mRunning = false;
LogUtil.v("ApiServiceLatencyCalculator stopped.");
}
}
/**
* @return the elapsed timestamp since the system boots if the {@link
* ApiServiceLatencyCalculator} instance is still running, otherwise the timestamp when it
* was stopped.
*/
private long getServiceElapsedTimestamp() {
if (mRunning) {
return mClock.elapsedRealtime();
}
return mStopElapsedTimestamp;
}
/**
* @return the api service elapsed time latency since {@link ApiServiceLatencyCalculator} starts
* in milliseconds on the service side. This method will not stop the {@link
* ApiServiceLatencyCalculator} and should be used for getting intermediate stage latency of
* a API process.
*/
public int getApiServiceElapsedLatencyMs() {
return (int) (getServiceElapsedTimestamp() - mStartElapsedTimestamp);
}
/**
* @return the api service overall latency since the {@link ApiServiceLatencyCalculator} starts
* in milliseconds without binder latency, on the server side. This method will stop the
* calculator if still running and the returned latency value will no longer change once the
* calculator is stopped. It should be used to get the complete process latency of an API
* within the server side.
*/
public int getApiServiceInternalFinalLatencyMs() {
stop();
return getApiServiceElapsedLatencyMs();
}
/**
* @return the approximate api service overall latency since the api is called at the client
* interface. This method will stop the {@link ApiServiceLatencyCalculator} if still running
* and the returned latency value will no longer change once the calculator is stopped. It
* should be used to get the complete process latency of an API.
*/
public int getApiServiceOverallLatencyMs() {
return (int)
((mStartElapsedTimestamp - mBinderElapsedTimestamp) * 2
+ getApiServiceInternalFinalLatencyMs());
}
}
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