src/com/android/launcher3/util/TraceHelper.java

/*
 * Copyright (C) 2017 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.launcher3.util;

import android.os.SystemClock;
import android.os.Trace;
import android.util.ArrayMap;
import android.util.Log;
import android.util.MutableLong;

import com.android.launcher3.config.FeatureFlags;

/**
 * A wrapper around {@link Trace} to allow easier proguarding for production builds.
 *
 * To enable any tracing log, execute the following command:
 * $ adb shell setprop log.tag.TAGNAME VERBOSE
 */
public class TraceHelper {

    private static final boolean ENABLED = FeatureFlags.IS_DOGFOOD_BUILD;

    private static final boolean SYSTEM_TRACE = false;
    private static final ArrayMap<String, MutableLong> sUpTimes = ENABLED ? new ArrayMap<>() : null;

    public static void beginSection(String sectionName) {
        if (ENABLED) {
            MutableLong time = sUpTimes.get(sectionName);
            if (time == null) {
                time = new MutableLong(Log.isLoggable(sectionName, Log.VERBOSE) ? 0 : -1);
                sUpTimes.put(sectionName, time);
            }
            if (time.value >= 0) {
                if (SYSTEM_TRACE) {
                    Trace.beginSection(sectionName);
                }
                time.value = SystemClock.uptimeMillis();
            }
        }
    }

    public static void partitionSection(String sectionName, String partition) {
        if (ENABLED) {
            MutableLong time = sUpTimes.get(sectionName);
            if (time.value >= 0) {

                if (SYSTEM_TRACE) {
                    Trace.endSection();
                    Trace.beginSection(sectionName);
                }

                long now = SystemClock.uptimeMillis();
                Log.d(sectionName, partition + " : " + (now - time.value));
                time.value = now;
            }
        }
    }

    public static void endSection(String sectionName) {
        if (ENABLED) {
            endSection(sectionName, "End");
        }
    }

    public static void endSection(String sectionName, String msg) {
        if (ENABLED) {
            MutableLong time = sUpTimes.get(sectionName);
            if (time.value >= 0) {
                if (SYSTEM_TRACE) {
                    Trace.endSection();
                }
                Log.d(sectionName, msg + " : " + (SystemClock.uptimeMillis() - time.value));
            }
        }
    }
}