| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.car; |
| |
| import android.car.Car; |
| import android.car.hardware.CarPropertyConfig; |
| import android.car.hardware.CarPropertyValue; |
| import android.car.hardware.property.CarPropertyEvent; |
| import android.car.hardware.property.ICarProperty; |
| import android.car.hardware.property.ICarPropertyEventListener; |
| import android.content.Context; |
| import android.os.IBinder; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import com.android.car.hal.PropertyHalServiceBase; |
| |
| import java.io.PrintWriter; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * This class implements the binder interface for ICarProperty.aidl to make it easier to create |
| * multiple managers that deal with Vehicle Properties. To create a new service, simply extend |
| * this class and call the super() constructor with the appropriate arguments for the new service. |
| * {@link CarHvacService} shows the basic usage. |
| */ |
| public class CarPropertyServiceBase extends ICarProperty.Stub |
| implements CarServiceBase, PropertyHalServiceBase.PropertyHalListener { |
| private final Context mContext; |
| private final boolean mDbg; |
| private final Map<IBinder, PropertyDeathRecipient> mDeathRecipientMap = |
| new ConcurrentHashMap<>(); |
| private final PropertyHalServiceBase mHal; |
| private final Map<IBinder, ICarPropertyEventListener> mListenersMap = new ConcurrentHashMap<>(); |
| private final String mPermission; |
| private final String mTag; |
| |
| private final Object mLock = new Object(); |
| |
| public CarPropertyServiceBase(Context context, PropertyHalServiceBase hal, String permission, |
| boolean dbg, String tag) { |
| mContext = context; |
| mHal = hal; |
| mPermission = permission; |
| mDbg = dbg; |
| mTag = tag + ".service"; |
| } |
| |
| class PropertyDeathRecipient implements IBinder.DeathRecipient { |
| private IBinder mListenerBinder; |
| |
| PropertyDeathRecipient(IBinder listenerBinder) { |
| mListenerBinder = listenerBinder; |
| } |
| |
| /** |
| * Client died. Remove the listener from HAL service and unregister if this is the last |
| * client. |
| */ |
| @Override |
| public void binderDied() { |
| if (mDbg) { |
| Log.d(mTag, "binderDied " + mListenerBinder); |
| } |
| CarPropertyServiceBase.this.unregisterListenerLocked(mListenerBinder); |
| } |
| |
| void release() { |
| mListenerBinder.unlinkToDeath(this, 0); |
| } |
| } |
| |
| @Override |
| public void init() { |
| } |
| |
| @Override |
| public void release() { |
| for (PropertyDeathRecipient recipient : mDeathRecipientMap.values()) { |
| recipient.release(); |
| } |
| mDeathRecipientMap.clear(); |
| mListenersMap.clear(); |
| } |
| |
| @Override |
| public void dump(PrintWriter writer) { |
| } |
| |
| @Override |
| public void registerListener(ICarPropertyEventListener listener) { |
| if (mDbg) { |
| Log.d(mTag, "registerListener"); |
| } |
| ICarImpl.assertPermission(mContext, mPermission); |
| if (listener == null) { |
| Log.e(mTag, "registerListener: Listener is null."); |
| throw new IllegalArgumentException("listener cannot be null."); |
| } |
| |
| IBinder listenerBinder = listener.asBinder(); |
| |
| synchronized (mLock) { |
| if (mListenersMap.containsKey(listenerBinder)) { |
| // Already registered, nothing to do. |
| return; |
| } |
| |
| PropertyDeathRecipient deathRecipient = new PropertyDeathRecipient(listenerBinder); |
| try { |
| listenerBinder.linkToDeath(deathRecipient, 0); |
| } catch (RemoteException e) { |
| Log.e(mTag, "Failed to link death for recipient. " + e); |
| throw new IllegalStateException(Car.CAR_NOT_CONNECTED_EXCEPTION_MSG); |
| } |
| mDeathRecipientMap.put(listenerBinder, deathRecipient); |
| |
| if (mListenersMap.isEmpty()) { |
| mHal.setListener(this); |
| } |
| |
| mListenersMap.put(listenerBinder, listener); |
| } |
| } |
| |
| @Override |
| public void unregisterListener(ICarPropertyEventListener listener) { |
| if (mDbg) { |
| Log.d(mTag, "unregisterListener"); |
| } |
| ICarImpl.assertPermission(mContext, mPermission); |
| if (listener == null) { |
| Log.e(mTag, "unregisterListener: Listener is null."); |
| throw new IllegalArgumentException("Listener is null"); |
| } |
| |
| IBinder listenerBinder = listener.asBinder(); |
| synchronized (mLock) { |
| if (!mListenersMap.containsKey(listenerBinder)) { |
| Log.e(mTag, "unregisterListener: Listener was not previously registered."); |
| } |
| unregisterListenerLocked(listenerBinder); |
| } |
| } |
| |
| // Removes the listenerBinder from the current state. |
| // The function assumes that binder will exist both in listeners and death recipients list. |
| private void unregisterListenerLocked(IBinder listenerBinder) { |
| boolean found = mListenersMap.remove(listenerBinder) != null; |
| |
| if (found) { |
| mDeathRecipientMap.get(listenerBinder).release(); |
| mDeathRecipientMap.remove(listenerBinder); |
| } |
| |
| if (mListenersMap.isEmpty()) { |
| mHal.setListener(null); |
| } |
| } |
| |
| @Override |
| public List<CarPropertyConfig> getPropertyList() { |
| ICarImpl.assertPermission(mContext, mPermission); |
| return mHal.getPropertyList(); |
| } |
| |
| @Override |
| public CarPropertyValue getProperty(int prop, int zone) { |
| ICarImpl.assertPermission(mContext, mPermission); |
| return mHal.getProperty(prop, zone); |
| } |
| |
| @Override |
| public void setProperty(CarPropertyValue prop) { |
| ICarImpl.assertPermission(mContext, mPermission); |
| mHal.setProperty(prop); |
| } |
| |
| private ICarPropertyEventListener[] getListeners() { |
| synchronized (mLock) { |
| int size = mListenersMap.values().size(); |
| return mListenersMap.values().toArray(new ICarPropertyEventListener[size]); |
| } |
| } |
| |
| // Implement PropertyHalListener interface |
| @Override |
| public void onPropertyChange(CarPropertyEvent event) { |
| for (ICarPropertyEventListener listener : getListeners()) { |
| try { |
| listener.onEvent(event); |
| } catch (RemoteException ex) { |
| // If we could not send a record, its likely the connection snapped. Let the binder |
| // death handle the situation. |
| Log.e(mTag, "onEvent calling failed: " + ex); |
| } |
| } |
| } |
| |
| @Override |
| public void onPropertySetError(int property, int area) { |
| for (ICarPropertyEventListener listener : getListeners()) { |
| try { |
| listener.onEvent(createErrorEvent(property, area)); |
| } catch (RemoteException ex) { |
| // If we could not send a record, its likely the connection snapped. Let the binder |
| // death handle the situation. |
| Log.e(mTag, "onEvent calling failed: " + ex); |
| } |
| } |
| } |
| |
| private static CarPropertyEvent createErrorEvent(int property, int area) { |
| return new CarPropertyEvent(CarPropertyEvent.PROPERTY_EVENT_ERROR, |
| new CarPropertyValue<>(property, area, null)); |
| } |
| } |