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      1 /*
      2  * Copyright (C) 2016 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 package com.android.storagemanager.deletionhelper;
     17 
     18 import android.os.Handler;
     19 import android.os.Looper;
     20 import android.os.Message;
     21 
     22 import com.android.settingslib.applications.ApplicationsState;
     23 import com.android.settingslib.applications.ApplicationsState.AppEntry;
     24 import com.android.settingslib.applications.ApplicationsState.Session;
     25 
     26 import java.util.ArrayList;
     27 
     28 /**
     29  * Common base class for bridging information to ApplicationsState.
     30  */
     31 public abstract class AppStateBaseBridge implements ApplicationsState.Callbacks {
     32 
     33     protected final ApplicationsState mAppState;
     34     protected final Session mAppSession;
     35     protected final Callback mCallback;
     36     protected final BackgroundHandler mHandler;
     37     protected final MainHandler mMainHandler;
     38 
     39     public AppStateBaseBridge(ApplicationsState appState, Callback callback) {
     40         mAppState = appState;
     41         mAppSession = mAppState != null ? mAppState.newSession(this) : null;
     42         mCallback = callback;
     43         // Running on the same background thread as the ApplicationsState lets
     44         // us run in the background and make sure they aren't doing updates at
     45         // the same time as us as well.
     46         mHandler = new BackgroundHandler(mAppState != null ? mAppState.getBackgroundLooper()
     47                 : Looper.getMainLooper());
     48         mMainHandler = new MainHandler();
     49     }
     50 
     51     public void resume() {
     52         mHandler.sendEmptyMessage(BackgroundHandler.MSG_LOAD_ALL);
     53         mAppSession.resume();
     54     }
     55 
     56     public void pause() {
     57         mAppSession.pause();
     58     }
     59 
     60     public void release() {
     61         mAppSession.release();
     62     }
     63 
     64     public void forceUpdate(String pkg, int uid) {
     65         mHandler.obtainMessage(BackgroundHandler.MSG_FORCE_LOAD_PKG, uid, 0, pkg).sendToTarget();
     66     }
     67 
     68     @Override
     69     public void onPackageListChanged() {
     70         mHandler.sendEmptyMessage(BackgroundHandler.MSG_LOAD_ALL);
     71     }
     72 
     73     @Override
     74     public void onLoadEntriesCompleted() {
     75         mHandler.sendEmptyMessage(BackgroundHandler.MSG_LOAD_ALL);
     76     }
     77 
     78     @Override
     79     public void onRunningStateChanged(boolean running) {
     80         // No op.
     81     }
     82 
     83     @Override
     84     public void onRebuildComplete(ArrayList<AppEntry> apps) {
     85         // No op.
     86     }
     87 
     88     @Override
     89     public void onPackageIconChanged() {
     90         // No op.
     91     }
     92 
     93     @Override
     94     public void onPackageSizeChanged(String packageName) {
     95         // No op.
     96     }
     97 
     98     @Override
     99     public void onAllSizesComputed() {
    100         // No op.
    101     }
    102 
    103     @Override
    104     public void onLauncherInfoChanged() {
    105         // No op.
    106     }
    107 
    108     protected abstract void loadAllExtraInfo();
    109     protected abstract void updateExtraInfo(AppEntry app, String pkg, int uid);
    110 
    111     private class MainHandler extends Handler {
    112         private static final int MSG_INFO_UPDATED = 1;
    113 
    114         @Override
    115         public void handleMessage(Message msg) {
    116             switch (msg.what) {
    117                 case MSG_INFO_UPDATED:
    118                     mCallback.onExtraInfoUpdated();
    119                     break;
    120             }
    121         }
    122     }
    123 
    124     private class BackgroundHandler extends Handler {
    125         private static final int MSG_LOAD_ALL = 1;
    126         private static final int MSG_FORCE_LOAD_PKG = 2;
    127 
    128         public BackgroundHandler(Looper looper) {
    129             super(looper);
    130         }
    131 
    132         @Override
    133         public void handleMessage(Message msg) {
    134             switch (msg.what) {
    135                 case MSG_LOAD_ALL:
    136                     loadAllExtraInfo();
    137                     mMainHandler.sendEmptyMessage(MainHandler.MSG_INFO_UPDATED);
    138                     break;
    139                 case MSG_FORCE_LOAD_PKG:
    140                     ArrayList<AppEntry> apps = mAppSession.getAllApps();
    141                     final int N = apps.size();
    142                     String pkg = (String) msg.obj;
    143                     int uid = msg.arg1;
    144                     for (int i = 0; i < N; i++) {
    145                         AppEntry app = apps.get(i);
    146                         if (app.info.uid == uid && pkg.equals(app.info.packageName)) {
    147                             updateExtraInfo(app, pkg, uid);
    148                         }
    149                     }
    150                     mMainHandler.sendEmptyMessage(MainHandler.MSG_INFO_UPDATED);
    151                     break;
    152             }
    153         }
    154     }
    155 
    156 
    157     public interface Callback {
    158         void onExtraInfoUpdated();
    159     }
    160 }
    161