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      1 /*
      2  * Copyright 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package androidx.work.impl.background.systemalarm;
     18 
     19 import android.content.Context;
     20 import android.content.Intent;
     21 import android.support.annotation.NonNull;
     22 import android.support.annotation.RestrictTo;
     23 import android.util.Log;
     24 
     25 import androidx.work.impl.Scheduler;
     26 import androidx.work.impl.model.WorkSpec;
     27 
     28 /**
     29  * A {@link Scheduler} that schedules work using {@link android.app.AlarmManager}.
     30  *
     31  * @hide
     32  */
     33 @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
     34 public class SystemAlarmScheduler implements Scheduler {
     35 
     36     private static final String TAG = "SystemAlarmScheduler";
     37 
     38     private final Context mContext;
     39 
     40     public SystemAlarmScheduler(@NonNull Context context) {
     41         mContext = context.getApplicationContext();
     42     }
     43 
     44     @Override
     45     public void schedule(WorkSpec... workSpecs) {
     46         for (WorkSpec workSpec : workSpecs) {
     47             scheduleWorkSpec(workSpec);
     48         }
     49     }
     50 
     51     @Override
     52     public void cancel(@NonNull String workSpecId) {
     53         Intent cancelIntent = CommandHandler.createStopWorkIntent(mContext, workSpecId);
     54         mContext.startService(cancelIntent);
     55     }
     56 
     57     /**
     58      * Periodic work is rescheduled using one-time alarms after each run. This allows the delivery
     59      * times to drift to guarantee that the interval duration always elapses between alarms.
     60      */
     61     private void scheduleWorkSpec(@NonNull WorkSpec workSpec) {
     62         Log.d(TAG, String.format("Scheduling work with workSpecId %s", workSpec.id));
     63         Intent scheduleIntent = CommandHandler.createScheduleWorkIntent(mContext, workSpec.id);
     64         mContext.startService(scheduleIntent);
     65     }
     66 }
     67