src/com/android/bluetooth/btservice/MetricsLogger.java

/*
 * Copyright 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.android.bluetooth.btservice;

import com.android.bluetooth.BluetoothMetricsProto.BluetoothLog;
import com.android.bluetooth.BluetoothMetricsProto.ProfileConnectionStats;
import com.android.bluetooth.BluetoothMetricsProto.ProfileId;

import java.util.HashMap;

/**
 * Class with static methods for logging metrics data
 */
public class MetricsLogger {
    private static final HashMap<ProfileId, Integer> sProfileConnectionCounts = new HashMap<>();

    /**
     * Log profile connection event by incrementing an internal counter for that profile.
     * This log persists over adapter enable/disable and only get cleared when metrics are
     * dumped or when Bluetooth process is killed.
     *
     * @param profileId Bluetooth profile that is connected at this event
     */
    public static void logProfileConnectionEvent(ProfileId profileId) {
        synchronized (sProfileConnectionCounts) {
            sProfileConnectionCounts.merge(profileId, 1, Integer::sum);
        }
    }

    /**
     * Dump collected metrics into proto using a builder.
     * Clean up internal data after the dump.
     *
     * @param metricsBuilder proto builder for {@link BluetoothLog}
     */
    public static void dumpProto(BluetoothLog.Builder metricsBuilder) {
        synchronized (sProfileConnectionCounts) {
            sProfileConnectionCounts.forEach(
                    (key, value) -> metricsBuilder.addProfileConnectionStats(
                            ProfileConnectionStats.newBuilder()
                                    .setProfileId(key)
                                    .setNumTimesConnected(value)
                                    .build()));
            sProfileConnectionCounts.clear();
        }
    }
}