解读JobScheduler的jobs.xml
一、jobs.xml
注册的job记录文件
- 源码路径:/frameworks/base/services/core/java/com/android/server/job/JobStore.java
- 系统中的job记录在文件jobs.xml，完整路径是/data/system/job/jobs.xml
private JobStore(Context context, File dataDir) {mContext = context;mDirtyOperations = 0;File systemDir = new File(dataDir, "system");File jobDir = new File(systemDir, "job");jobDir.mkdirs();mJobsFile = new AtomicFile(new File(jobDir, "jobs.xml"));mJobSet = new ArraySet<JobStatus>();readJobMapFromDisk(mJobSet);}
小米手机的jobs.xml
root@Xiaomi:/data/system/job # cat jobs.xml
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
<job-info version="0"><job jobid="137303610" package="com.google.android.apps.maps" class="com.google.android.apps.gmm.offline.OfflineAutoUpdateJobService" uid="10099"><constraints connectivity="true" idle="true" charging="true" /><periodic period="86400000" delay="1485554596322" /><extras /></job><job jobid="137303609" package="com.google.android.apps.maps" class="com.google.android.apps.gmm.offline.OfflineAutoUpdateJobService" uid="10099"><constraints connectivity="true" idle="true" charging="true" /><one-off delay="1485444550825" /><extras /></job><job jobid="1" package="com.example.wfcvs" class="com.example.wfcvs.wenfengService" uid="10146"><constraints charging="true" /><one-off delay="1485348887275" /><extras /></job><job jobid="20537" package="android" class="com.android.server.backup.KeyValueBackupJob" uid="1000"><constraints connectivity="true" charging="true" /><one-off deadline="1485591350955" delay="1485519812187" /><extras /></job><job jobid="808" package="android" class="com.android.server.MountServiceIdler" uid="1000"><constraints idle="true" charging="true" /><one-off delay="1485417599095" /><extras /></job>
</job-info>
二、job参数解释
| 参数 | 解释 |
|---|---|
| jobid | 每个job的id，android.app.job.JobInfo.Builder.Builder(int jobId, ComponentName jobService) 指定 |
| package | 包名 |
| class | job的类名，这个类继承于JobService |
| uid | 应用uid |
| constraints | job被调度的条件 |
| one-off | 跟时间相关，记录job的deadline，和延时执行的时间，注意这个是时间点，由函数systemclock.elapsedrealtime()生成，即系统启动的时间，到这个时间点job会被触发 |
例如: <constraints connectivity=“true” charging=“true” /> 代表网络连接并且在充电状态下，job会被调度 <one-off delay=“1485348887275” /> 代表job在满足条件的情况下，必须要等到1485348887275这个时间点才会被执行
jobs.xml文件需要手机root情况下才能查看，没有root要怎么查看呢？当然有方法，执行adb shell dumpsys jobscheduler
三、adb shell dumpsys jobscheduler
void dump(IndentingPrintWriter pw) {pw.println("Settings:");pw.increaseIndent();pw.print(KEY_MIN_READY_NON_ACTIVE_JOBS_COUNT,MIN_READY_NON_ACTIVE_JOBS_COUNT).println();pw.print(KEY_MAX_NON_ACTIVE_JOB_BATCH_DELAY_MS,MAX_NON_ACTIVE_JOB_BATCH_DELAY_MS).println();pw.print(KEY_HEAVY_USE_FACTOR, HEAVY_USE_FACTOR).println();pw.print(KEY_MODERATE_USE_FACTOR, MODERATE_USE_FACTOR).println();pw.print(KEY_MIN_LINEAR_BACKOFF_TIME_MS, MIN_LINEAR_BACKOFF_TIME_MS).println();pw.print(KEY_MIN_EXP_BACKOFF_TIME_MS, MIN_EXP_BACKOFF_TIME_MS).println();pw.print(KEY_CONN_CONGESTION_DELAY_FRAC, CONN_CONGESTION_DELAY_FRAC).println();pw.print(KEY_CONN_PREFETCH_RELAX_FRAC, CONN_PREFETCH_RELAX_FRAC).println();pw.print(KEY_ENABLE_API_QUOTAS, ENABLE_API_QUOTAS).println();pw.print(KEY_API_QUOTA_SCHEDULE_COUNT, API_QUOTA_SCHEDULE_COUNT).println();pw.print(KEY_API_QUOTA_SCHEDULE_WINDOW_MS, API_QUOTA_SCHEDULE_WINDOW_MS).println();pw.print(KEY_API_QUOTA_SCHEDULE_THROW_EXCEPTION,API_QUOTA_SCHEDULE_THROW_EXCEPTION).println();pw.print(KEY_API_QUOTA_SCHEDULE_RETURN_FAILURE_RESULT,API_QUOTA_SCHEDULE_RETURN_FAILURE_RESULT).println();pw.print(KEY_RUNTIME_MIN_GUARANTEE_MS, RUNTIME_MIN_GUARANTEE_MS).println();pw.print(KEY_RUNTIME_MIN_EJ_GUARANTEE_MS, RUNTIME_MIN_EJ_GUARANTEE_MS).println();pw.print(KEY_RUNTIME_FREE_QUOTA_MAX_LIMIT_MS, RUNTIME_FREE_QUOTA_MAX_LIMIT_MS).println();pw.decreaseIndent();
}