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      1 /*
      2  * Copyright 2018 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.support.annotation.WorkerThread;
     24 import android.util.Log;
     25 
     26 import androidx.work.impl.constraints.WorkConstraintsTracker;
     27 import androidx.work.impl.model.WorkSpec;
     28 
     29 import java.util.ArrayList;
     30 import java.util.List;
     31 
     32 /**
     33  * This is a command handler which handles the constraints changed event.
     34  * Typically this happens for WorkSpec's for which we have pending alarms.
     35  *
     36  * @hide
     37  */
     38 @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
     39 class ConstraintsCommandHandler {
     40 
     41     private static final String TAG = "ConstraintsCmdHandler";
     42 
     43     private final Context mContext;
     44     private final int mStartId;
     45     private final SystemAlarmDispatcher mDispatcher;
     46     private final List<WorkSpec> mEligibleWorkSpecs;
     47     private final WorkConstraintsTracker mWorkConstraintsTracker;
     48 
     49     ConstraintsCommandHandler(
     50             @NonNull Context context,
     51             int startId,
     52             @NonNull SystemAlarmDispatcher dispatcher) {
     53 
     54         mContext = context;
     55         mStartId = startId;
     56         mDispatcher = dispatcher;
     57         mWorkConstraintsTracker = new WorkConstraintsTracker(mContext, null);
     58         mEligibleWorkSpecs = new ArrayList<>();
     59     }
     60 
     61     @WorkerThread
     62     void handleConstraintsChanged() {
     63         int schedulerLimit = mDispatcher
     64                 .getWorkManager()
     65                 .getConfiguration()
     66                 .getMaxSchedulerLimit();
     67 
     68         List<WorkSpec> candidates = mDispatcher.getWorkManager().getWorkDatabase()
     69                 .workSpecDao()
     70                 .getEligibleWorkForScheduling(schedulerLimit);
     71 
     72         // Filter candidates that are marked as SCHEDULE_NOT_REQUESTED_AT
     73         List<WorkSpec> eligibleWorkSpecs = new ArrayList<>(candidates.size());
     74         for (WorkSpec candidate: candidates) {
     75             if (candidate.scheduleRequestedAt != WorkSpec.SCHEDULE_NOT_REQUESTED_YET) {
     76                 eligibleWorkSpecs.add(candidate);
     77             }
     78         }
     79 
     80         // Update constraint proxy to potentially disable proxies for previously
     81         // completed WorkSpecs.
     82         ConstraintProxy.updateAll(mContext, eligibleWorkSpecs);
     83         // This needs to be done to populate matching WorkSpec ids in every constraint
     84         // controller.
     85         mWorkConstraintsTracker.replace(eligibleWorkSpecs);
     86 
     87         for (WorkSpec workSpec : eligibleWorkSpecs) {
     88             String workSpecId = workSpec.id;
     89             if (!workSpec.hasConstraints()
     90                     || mWorkConstraintsTracker.areAllConstraintsMet(workSpecId)) {
     91                 mEligibleWorkSpecs.add(workSpec);
     92             }
     93         }
     94 
     95         for (WorkSpec workSpec : mEligibleWorkSpecs) {
     96             String workSpecId = workSpec.id;
     97             Intent intent = CommandHandler.createDelayMetIntent(mContext, workSpecId);
     98             Log.d(TAG, String.format(
     99                     "Creating a delay_met command for workSpec with id (%s)", workSpecId));
    100             mDispatcher.postOnMainThread(
    101                     new SystemAlarmDispatcher.AddRunnable(mDispatcher, intent, mStartId));
    102         }
    103         mWorkConstraintsTracker.reset();
    104     }
    105 }
    106