Document job scheduler wakelock policy

import android.annotation.SystemService;

import android.content.ClipData;

import android.content.Context;

import android.content.Intent;

import android.os.Bundle;

import android.os.PersistableBundle;

 * and how to construct them. You will construct these JobInfo objects and pass them to the

 * JobScheduler with {@link #schedule(JobInfo)}. When the criteria declared are met, the

 * system will execute this job on your application's {@link android.app.job.JobService}.

 * You identify which JobService is meant to execute the logic for your job when you create the

 * JobInfo with

 * You identify the service component that implements the logic for your job when you

 * construct the JobInfo using

 * {@link android.app.job.JobInfo.Builder#JobInfo.Builder(int,android.content.ComponentName)}.

 * </p>

 * <p>

 * The framework will be intelligent about when you receive your callbacks, and attempt to batch

 * and defer them as much as possible. Typically if you don't specify a deadline on your job, it

 * can be run at any moment depending on the current state of the JobScheduler's internal queue,

 * however it might be deferred as long as until the next time the device is connected to a power

 * source.

 * The framework will be intelligent about when it executes jobs, and attempt to batch

 * and defer them as much as possible. Typically if you don't specify a deadline on a job, it

 * can be run at any moment depending on the current state of the JobScheduler's internal queue.

 * <p>

 * While a job is running, the system holds a wakelock on behalf of your app.  For this reason,

 * you do not need to take any action to guarantee that the device stays awake for the

 * duration of the job.

 * </p>

 * <p>You do not

 * instantiate this class directly; instead, retrieve it through

            int userId, String tag);

    /**

     * Cancel a job that is pending in the JobScheduler.

     * @param jobId unique identifier for this job. Obtain this value from the jobs returned by

     * {@link #getAllPendingJobs()}.

     * Cancel the specified job.  If the job is currently executing, it is stopped

     * immediately and the return value from its {@link JobService#onStopJob(JobParameters)}

     * method is ignored.

     *

     * @param jobId unique identifier for the job to be canceled, as supplied to

     *     {@link JobInfo.Builder#JobInfo.Builder(int, android.content.ComponentName)

     *     JobInfo.Builder(int, android.content.ComponentName)}.

     */

    public abstract void cancel(int jobId);

    /**

     * Cancel all jobs that have been registered with the JobScheduler by this package.

     * Cancel <em>all</em> jobs that have been scheduled by the calling application.

     */

    public abstract void cancelAll();

    /**

     * Retrieve all jobs for this package that are pending in the JobScheduler.

     * Retrieve all jobs that have been scheduled by the calling application.

     *

     * @return a list of all the jobs registered by this package that have not

     *         yet been executed.

     * @return a list of all of the app's scheduled jobs.  This includes jobs that are

     *     currently started as well as those that are still waiting to run.

     */

    public abstract @NonNull List<JobInfo> getAllPendingJobs();

    /**

     * Retrieve a specific job for this package that is pending in the

     * JobScheduler.

     * Look up the description of a scheduled job.

     *

     * @return job registered by this package that has not yet been executed.

     * @return The {@link JobInfo} description of the given scheduled job, or {@code null}

     *     if the supplied job ID does not correspond to any job.

     */

    public abstract @Nullable JobInfo getPendingJob(int jobId);

}

import android.app.Service;

import android.content.Intent;

import android.os.Handler;

import android.os.IBinder;

import android.os.Looper;

import android.os.Message;

import android.os.RemoteException;

import android.util.Log;

import com.android.internal.annotations.GuardedBy;

import java.lang.ref.WeakReference;

/**

 * <p>Entry point for the callback from the {@link android.app.job.JobScheduler}.</p>

     * </pre>

     *

     * <p>If a job service is declared in the manifest but not protected with this

     * permission, that service will be ignored by the OS.

     * permission, that service will be ignored by the system.

     */

    public static final String PERMISSION_BIND =

            "android.permission.BIND_JOB_SERVICE";

    }

    /**

     * Override this method with the callback logic for your job. Any such logic needs to be

     * performed on a separate thread, as this function is executed on your application's main

     * thread.

     * Called to indicate that the job has begun executing.  Override this method with the

     * logic for your job.  Like all other component lifecycle callbacks, this method executes

     * on your application's main thread.

     * <p>

     * Return {@code true} from this method if your job needs to continue running.  If you

     * do this, the job remains active until you call

     * {@link #jobFinished(JobParameters, boolean)} to tell the system that it has completed

     * its work, or until the job's required constraints are no longer satisfied.  For

     * example, if the job was scheduled using

     * {@link JobInfo.Builder#setRequiresCharging(boolean) setRequiresCharging(true)},

     * it will be immediately halted by the system if the user unplugs the device from power,

     * the job's {@link #onStopJob(JobParameters)} callback will be invoked, and the app

     * will be expected to shut down all ongoing work connected with that job.

     * <p>

     * The system holds a wakelock on behalf of your app as long as your job is executing.

     * This wakelock is acquired before this method is invoked, and is not released until either

     * you call {@link #jobFinished(JobParameters, boolean)}, or after the system invokes

     * {@link #onStopJob(JobParameters)} to notify your job that it is being shut down

     * prematurely.

     * <p>

     * Returning {@code false} from this method means your job is already finished.  The

     * system's wakelock for the job will be released, and {@link #onStopJob(JobParameters)}

     * will not be invoked.

     *

     * @param params Parameters specifying info about this job, including the extras bundle you

     *               optionally provided at job-creation time.

     * @return True if your service needs to process the work (on a separate thread). False if

     * there's no more work to be done for this job.

     * @param params Parameters specifying info about this job, including the optional

     *     extras configured with {@link JobInfo.Builder#setExtras(android.os.PersistableBundle).

     *     This object serves to identify this specific running job instance when calling

     *     {@link #jobFinished(JobParameters, boolean)}.

     * @return {@code true} if your service will continue running, using a separate thread

     *     when appropriate.  {@code false} means that this job has completed its work.

     */

    public abstract boolean onStartJob(JobParameters params);

     * {@link android.app.job.JobInfo.Builder#setRequiredNetworkType(int)}, yet while your

     * job was executing the user toggled WiFi. Another example is if you had specified

     * {@link android.app.job.JobInfo.Builder#setRequiresDeviceIdle(boolean)}, and the phone left its

     * idle maintenance window. You are solely responsible for the behaviour of your application

     * upon receipt of this message; your app will likely start to misbehave if you ignore it. One

     * immediate repercussion is that the system will cease holding a wakelock for you.</p>

     * idle maintenance window. You are solely responsible for the behavior of your application

     * upon receipt of this message; your app will likely start to misbehave if you ignore it.

     * <p>

     * Once this method returns, the system releases the wakelock that it is holding on

     * behalf of the job.</p>

     *

     * @param params Parameters specifying info about this job.

     * @return True to indicate to the JobManager whether you'd like to reschedule this job based

     * on the retry criteria provided at job creation-time. False to drop the job. Regardless of

     * the value returned, your job must stop executing.

     * @param params The parameters identifying this job, as supplied to

     *               the job in the {@link #onStartJob(JobParameters)} callback.

     * @return {@code true} to indicate to the JobManager whether you'd like to reschedule

     * this job based on the retry criteria provided at job creation-time; or {@code false}

     * to end the job entirely.  Regardless of the value returned, your job must stop executing.

     */

    public abstract boolean onStopJob(JobParameters params);

    /**

     * Call this to inform the JobManager you've finished executing. This can be called from any

     * thread, as it will ultimately be run on your application's main thread. When the system

     * receives this message it will release the wakelock being held.

     * Call this to inform the JobScheduler that the job has finished its work.  When the

     * system receives this message, it releases the wakelock being held for the job.

     * <p>

     *     You can specify post-execution behaviour to the scheduler here with

     *     <code>needsReschedule </code>. This will apply a back-off timer to your job based on

     *     the default, or what was set with

     *     {@link android.app.job.JobInfo.Builder#setBackoffCriteria(long, int)}. The original

     *     requirements are always honoured even for a backed-off job. Note that a job running in

     *     idle mode will not be backed-off. Instead what will happen is the job will be re-added

     *     to the queue and re-executed within a future idle maintenance window.

     * You can request that the job be scheduled again by passing {@code true} as

     * the <code>wantsReschedule</code> parameter. This will apply back-off policy

     * for the job; this policy can be adjusted through the

     * {@link android.app.job.JobInfo.Builder#setBackoffCriteria(long, int)} method

     * when the job is originally scheduled.  The job's initial

     * requirements are preserved when jobs are rescheduled, regardless of backed-off

     * policy.

     * <p class="note">

     * A job running while the device is dozing will not be rescheduled with the normal back-off

     * policy.  Instead, the job will be re-added to the queue and executed again during

     * a future idle maintenance window.

     * </p>

     *

     * @param params Parameters specifying system-provided info about this job, this was given to

     *               your application in {@link #onStartJob(JobParameters)}.

     * @param needsReschedule True if this job should be rescheduled according to the back-off

     *                        criteria specified at schedule-time. False otherwise.

     * @param params The parameters identifying this job, as supplied to

     *               the job in the {@link #onStartJob(JobParameters)} callback.

     * @param wantsReschedule {@code true} if this job should be rescheduled according

     *     to the back-off criteria specified when it was first scheduled; {@code false}

     *     otherwise.

     */

    public final void jobFinished(JobParameters params, boolean needsReschedule) {

        mEngine.jobFinished(params, needsReschedule);

    public final void jobFinished(JobParameters params, boolean wantsReschedule) {

        mEngine.jobFinished(params, wantsReschedule);

    }

}