前言

埋点是线上项目采集数据的一种重要方式，这些可能是对error数据的采集，也可能是对用户偏好的采集。其实质其实就是在代码的相应位置添加埋点，执行相应埋点代码后能够将信息记录到对应文件中，然后在一定时机下上传到服务器。

关键问题

埋点要解决的几个关键问题如下：
1、由于全局都可能使用到埋点，因此一般埋点为单例模式。
2、放置埋点不可避免在多个线程的情况，因此要使用handler来实现，埋点要有自己的线程并且有Looper循环。
3、部分埋点逻辑可能要由业务中去实现，因此要由相应接口。

代码

1、定义了logTypeFilter变量，来保证只有已经定义的埋点类型才会被记录。未知的（没有定义的）埋点类型会被过滤。
2、Record内部类是此处定义的埋点结构。
3、此处record(String logType, String logContent, Exception exception)是提供给全局使用的设置埋点的方法。

/**** Copyright 2018 iQIYI.com** 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.iqiyi.halberd.liteapp.utils;import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.os.Process;
import android.util.Log;/*** Created by eggizhang@qiyi.com on 17-10-27.* Using this utils for performance recording and process recording of lite app*/
public class LogUtils {public static final String TAG = LogUtils.class.getName();public static final String LOG_MINI_PROGRAM_ACTIVITY_LIFE_CYCLE = "log_type_app_activity_life_cycle";public static final String LOG_MINI_PROGRAM_PAGE_LIFE_CYCLE = "log_type_app_page_life_cycle";public static final String LOG_MINI_PROGRAM_FRAGMENT_LIFE_CYCLE = "log_type_app_fragment_life_cycle";public static final String LOG_MINI_PROGRAM_CACHE = "log_lite_app_cache";public static final String LOG_MINI_PROGRAM_EVENT = "log_lite_app_event";public static final String LOG_MINI_PROGRAM_ERROR = "log_lite_app_error";public static final String ACTION_START=" action start";public static final String ACTION_STOP=" action stop";public static final String LIFE_OBJECT_CREATE = " object create";public static final String LIFE_CREATE = " onCreate";public static final String LIFE_START = " onStart";public static final String LIFE_RESUME = " onResume";public static final String LIFE_PAUSE = " onPause";public static final String LIFE_STOP = " onStop";public static final String LIFE_DESTROY = " onDestroy";public static final String LIFE_CREATE_VIEW = " onCreateView";public static final String LIFE_DESTROY_VIEW = " onDestroyView";public static final String LIFE_ACTIVITY = " liteAppActivity";public static final String LIFE_FRAGMENT = " liteAppFragment";public static final String LIFE_PAGE = " liteAppPage";public static final String LIFE_WEB_VIEW = " halWebView";public static final String PAGE_CONTEXT_CREATE = " page context create";public static final String PAGE_CONTEXT_DISPOSE = " page context dispose";public static final String PAGE_THREAD_CREATE = " page thread create";public static final String PAGE_THREAD_STOP = " page thread stop";public static final String FRAGMENT_PUSH = " fragment push";public static final String FRAGMENT_POP = " fragment pop";public static final String CACHE_PAGE = " page cache";public static final String CACHE_FILE = " file cache";public static final String CACHE_IMAGE = " image cache";public static final String CACHE_MEMORY_HIT = " memory hit";public static final String CACHE_DISK_HIT = " disk hit";public static final String CACHE_MEMORY_CREATE = " memory create";public static final String CACHE_DISK_CREATE = " disk create";public static final String CACHE_NETWORK = " network access";public static final String CACHE_CHECK_UPDATE = "check update";public static final String COMMON_FAIL = "failed";public static final String COMMON_SUCCESS = "success";public static final String EVENT_TYPE = " event type is ";private final static String[] logTypeFilter = new String[]{LOG_MINI_PROGRAM_ACTIVITY_LIFE_CYCLE,LOG_MINI_PROGRAM_PAGE_LIFE_CYCLE,LOG_MINI_PROGRAM_FRAGMENT_LIFE_CYCLE,LOG_MINI_PROGRAM_CACHE,LOG_MINI_PROGRAM_EVENT,LOG_MINI_PROGRAM_ERROR};private static LogUtils instance = null;private String applicationFilesDir=null;private Thread logThread = null;private String manufacture = null;private String model = null;private String liteAppID = null;private boolean isNormalSize = true;private int messageQueueSize=0;private static final int QUEUE_MAX_SIZE = 100;private static final int QUEUE_NORMAL_SIZE = 5;private Handler handler;private static final int LOG_RECORD=0;private static final int REMOVE_EXTRA_FILES=1;private LogProvider logProvider;public static void setLogProvider(LogProvider logProvider) {getInstance().logProvider = logProvider;}public interface LogProvider {void doRecord(Record record, Exception e);void clearLogFile(String applicationFileDir);}private LogUtils() {}public static LogUtils getInstance() {if (instance == null) {synchronized (LogUtils.class) {if (instance == null) {instance = new LogUtils();}}}return instance;}public void init(Context context) {if (logThread == null) {applicationFilesDir=context.getFilesDir().getPath();manufacture = android.os.Build.MANUFACTURER;model = android.os.Build.MODEL;startThreadLoop();}}public String getApplicationFilesDir() {return applicationFilesDir;}public void setLiteAppIdIfNull(String liteAppID) {if (this.liteAppID == null) {this.liteAppID = liteAppID;}}private void startThreadLoop() {logThread = new Thread(new Runnable() {@SuppressLint("HandlerLeak")@Overridepublic void run() {Looper.prepare();handler=new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);try{switch (msg.what){case LOG_RECORD:consume((Record) msg.obj);break;case REMOVE_EXTRA_FILES:if(logProvider!=null)logProvider.clearLogFile(applicationFilesDir);break;}} catch (Exception e) {Log.e(LOG_MINI_PROGRAM_ERROR, "logFile name unknown error.", e);}}};Message msg=handler.obtainMessage();msg.what=REMOVE_EXTRA_FILES;handler.sendMessage(msg);Looper.loop();}});logThread.start();}private void consume(Record record) {//TODO 这里留上传接口if (record.exception == null) {Log.v("lite-app-log", record.toString());} else {Log.e("lite-app-error", record.toString(), record.exception);}if(logProvider!=null)logProvider.doRecord(record, record.exception);messageQueueSize--;}public class Record {private String logType;private long time;private int pid;private long tid;private String content;private Exception exception = null;public String getContent() {return content;}public long getTime() {return time;}@Overridepublic String toString() {if (messageQueueSize > QUEUE_MAX_SIZE) {isNormalSize = false;} else if (messageQueueSize < QUEUE_NORMAL_SIZE) {isNormalSize = true;}if (isNormalSize) {return "time:" + time + "," +"content:" + content + "," +"manufacture:" + manufacture + "," +"model:" + model + "," +"pid:" + pid + "," +"tid:" + tid + "," +"queueing:" + messageQueueSize + "," +"logType:" + logType + "," +"liteAppID:" + liteAppID + "," +".";} else {return "too muck log" + logType;}}}public static void log(String logType, String logContent) {if(getInstance().logThread!=null&&getInstance().handler!=null)getInstance().record(logType, logContent, null);}public static void logError(String logType, String logContent, Exception exception) {if(getInstance().logThread!=null&&getInstance().handler!=null)getInstance().record(logType, logContent, exception);}private void record(String logType, String logContent, Exception exception) {for (String aLogTypeFilter : logTypeFilter) {if (aLogTypeFilter.equals(logType)) {Record newRecord = new Record();newRecord.time = System.currentTimeMillis();newRecord.pid = Process.myPid();newRecord.tid = Thread.currentThread().getId();newRecord.content = logContent;newRecord.logType = logType;if (exception != null && logType.equals(LOG_MINI_PROGRAM_ERROR)) {newRecord.exception = exception;}Message msg=handler.obtainMessage();msg.what=LOG_RECORD;msg.obj=newRecord;handler.sendMessage(msg);messageQueueSize++;return;}}}
}

更多内容可以查看github官方开源项目：
https://github.com/iqiyi/LiteApp

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【LiteApp系列】埋点的设计

前言

关键问题

代码

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