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      1 /*
      2  * Copyright (C) 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 com.android.internal.telephony.ims;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.ServiceConnection;
     23 import android.os.IBinder;
     24 import android.os.RemoteException;
     25 import android.telephony.ims.aidl.IImsServiceController;
     26 import android.telephony.ims.stub.ImsFeatureConfiguration;
     27 import android.util.Log;
     28 
     29 import java.util.HashMap;
     30 import java.util.Map;
     31 import java.util.Set;
     32 
     33 /**
     34  * Manages the querying of multiple ImsServices asynchronously in order to retrieve the ImsFeatures
     35  * they support.
     36  */
     37 
     38 public class ImsServiceFeatureQueryManager {
     39 
     40     private final class ImsServiceFeatureQuery implements ServiceConnection {
     41 
     42         private static final String LOG_TAG = "ImsServiceFeatureQuery";
     43 
     44         private final ComponentName mName;
     45         private final String mIntentFilter;
     46 
     47         ImsServiceFeatureQuery(ComponentName name, String intentFilter) {
     48             mName = name;
     49             mIntentFilter = intentFilter;
     50         }
     51 
     52         /**
     53          * Starts the bind to the ImsService specified ComponentName.
     54          * @return true if binding started, false if it failed and will not recover.
     55          */
     56         public boolean start() {
     57             Log.d(LOG_TAG, "start: intent filter=" + mIntentFilter + ", name=" + mName);
     58             Intent imsServiceIntent = new Intent(mIntentFilter).setComponent(mName);
     59             int serviceFlags = Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE
     60                     | Context.BIND_IMPORTANT;
     61             boolean bindStarted = mContext.bindService(imsServiceIntent, this, serviceFlags);
     62             if (!bindStarted) {
     63                 // Docs say to unbind if this fails.
     64                 cleanup();
     65             }
     66             return bindStarted;
     67         }
     68 
     69         @Override
     70         public void onServiceConnected(ComponentName name, IBinder service) {
     71             Log.i(LOG_TAG, "onServiceConnected for component: " + name);
     72             if (service != null) {
     73                 queryImsFeatures(IImsServiceController.Stub.asInterface(service));
     74             } else {
     75                 Log.w(LOG_TAG, "onServiceConnected: " + name + " binder null, cleaning up.");
     76                 cleanup();
     77             }
     78         }
     79 
     80         @Override
     81         public void onServiceDisconnected(ComponentName name) {
     82             Log.w(LOG_TAG, "onServiceDisconnected for component: " + name);
     83         }
     84 
     85         private void queryImsFeatures(IImsServiceController controller) {
     86             ImsFeatureConfiguration config;
     87             try {
     88                 config = controller.querySupportedImsFeatures();
     89             } catch (RemoteException e) {
     90                 Log.w(LOG_TAG, "queryImsFeatures - error: " + e);
     91                 cleanup();
     92                 mListener.onError(mName);
     93                 return;
     94             }
     95             Set<ImsFeatureConfiguration.FeatureSlotPair> servicePairs = config.getServiceFeatures();
     96             // Complete, remove from active queries and notify.
     97             cleanup();
     98             mListener.onComplete(mName, servicePairs);
     99         }
    100 
    101         private void cleanup() {
    102             mContext.unbindService(this);
    103             synchronized (mLock) {
    104                 mActiveQueries.remove(mName);
    105             }
    106         }
    107     }
    108 
    109     public interface Listener {
    110         /**
    111          * Called when a query has completed.
    112          * @param name The Package Name of the query
    113          * @param features A Set of slotid->feature pairs that the ImsService supports.
    114          */
    115         void onComplete(ComponentName name, Set<ImsFeatureConfiguration.FeatureSlotPair> features);
    116 
    117         /**
    118          * Called when a query has failed and should be retried.
    119          */
    120         void onError(ComponentName name);
    121     }
    122 
    123     // Maps an active ImsService query (by Package Name String) its query.
    124     private final Map<ComponentName, ImsServiceFeatureQuery> mActiveQueries = new HashMap<>();
    125     private final Context mContext;
    126     private final Listener mListener;
    127     private final Object mLock = new Object();
    128 
    129     public ImsServiceFeatureQueryManager(Context context, Listener listener) {
    130         mContext = context;
    131         mListener = listener;
    132     }
    133 
    134     /**
    135      * Starts an ImsService feature query for the ComponentName and Intent specified.
    136      * @param name The ComponentName of the ImsService being queried.
    137      * @param intentFilter The Intent filter that the ImsService specified.
    138      * @return true if the query started, false if it was unable to start.
    139      */
    140     public boolean startQuery(ComponentName name, String intentFilter) {
    141         synchronized (mLock) {
    142             if (mActiveQueries.containsKey(name)) {
    143                 // We already have an active query, wait for it to return.
    144                 return true;
    145             }
    146             ImsServiceFeatureQuery query = new ImsServiceFeatureQuery(name, intentFilter);
    147             mActiveQueries.put(name, query);
    148             return query.start();
    149         }
    150     }
    151 
    152     /**
    153      * @return true if there are any active queries, false if the manager is idle.
    154      */
    155     public boolean isQueryInProgress() {
    156         synchronized (mLock) {
    157             return !mActiveQueries.isEmpty();
    158         }
    159     }
    160 }
    161