| /* |
| * 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 android.hardware.location; |
| |
| import android.Manifest; |
| import android.content.Context; |
| import android.os.RemoteException; |
| import android.util.Log; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| |
| /** |
| * @hide |
| */ |
| public class ContextHubService extends IContextHubService.Stub { |
| |
| public static final String CONTEXTHUB_SERVICE = "contexthub_service"; |
| |
| private static final String TAG = "ContextHubService"; |
| private static final String HARDWARE_PERMISSION = Manifest.permission.LOCATION_HARDWARE; |
| private static final String ENFORCE_HW_PERMISSION_MESSAGE = "Permission '" |
| + HARDWARE_PERMISSION + "' not granted to access ContextHub Hardware"; |
| |
| |
| public static final int ANY_HUB = -1; |
| public static final int MSG_LOAD_NANO_APP = 3; |
| public static final int MSG_UNLOAD_NANO_APP = 4; |
| |
| private static final String PRE_LOADED_GENERIC_UNKNOWN = "Preloaded app, unknown"; |
| private static final String PRE_LOADED_APP_NAME = PRE_LOADED_GENERIC_UNKNOWN; |
| private static final String PRE_LOADED_APP_PUBLISHER = PRE_LOADED_GENERIC_UNKNOWN; |
| private static final int PRE_LOADED_APP_MEM_REQ = 0; |
| |
| private static final int MSG_HEADER_SIZE = 4; |
| private static final int MSG_FIELD_TYPE = 0; |
| private static final int MSG_FIELD_VERSION = 1; |
| private static final int MSG_FIELD_HUB_HANDLE = 2; |
| private static final int MSG_FIELD_APP_INSTANCE = 3; |
| |
| private static final int OS_APP_INSTANCE = -1; |
| |
| private final Context mContext; |
| |
| private HashMap<Integer, NanoAppInstanceInfo> mNanoAppHash; |
| private ContextHubInfo[] mContextHubInfo; |
| private IContextHubCallback mCallback; |
| |
| private native int nativeSendMessage(int[] header, byte[] data); |
| private native ContextHubInfo[] nativeInitialize(); |
| |
| |
| public ContextHubService(Context context) { |
| mContext = context; |
| mContextHubInfo = nativeInitialize(); |
| mNanoAppHash = new HashMap<Integer, NanoAppInstanceInfo>(); |
| |
| for (int i = 0; i < mContextHubInfo.length; i++) { |
| Log.d(TAG, "ContextHub[" + i + "] id: " + mContextHubInfo[i].getId() |
| + ", name: " + mContextHubInfo[i].getName()); |
| } |
| } |
| |
| @Override |
| public int registerCallback(IContextHubCallback callback) throws RemoteException { |
| checkPermissions(); |
| synchronized(this) { |
| mCallback = callback; |
| } |
| return 0; |
| } |
| |
| @Override |
| public int[] getContextHubHandles() throws RemoteException { |
| checkPermissions(); |
| int [] returnArray = new int[mContextHubInfo.length]; |
| |
| for (int i = 0; i < returnArray.length; ++i) { |
| returnArray[i] = i + 1; //valid handles from 1...n |
| Log.d(TAG, String.format("Hub %s is mapped to %d", |
| mContextHubInfo[i].getName(), returnArray[i])); |
| } |
| |
| return returnArray; |
| } |
| |
| @Override |
| public ContextHubInfo getContextHubInfo(int contextHubHandle) throws RemoteException { |
| checkPermissions(); |
| contextHubHandle -= 1; |
| if (!(contextHubHandle >= 0 && contextHubHandle < mContextHubInfo.length)) { |
| return null; // null means fail |
| } |
| |
| return mContextHubInfo[contextHubHandle]; |
| } |
| |
| @Override |
| public int loadNanoApp(int contextHubHandle, NanoApp app) throws RemoteException { |
| checkPermissions(); |
| contextHubHandle -= 1; |
| |
| if (!(contextHubHandle >= 0 && contextHubHandle < mContextHubInfo.length)) { |
| return -1; // negative handle are invalid, means failed |
| } |
| |
| // Call Native interface here |
| int[] msgHeader = new int[MSG_HEADER_SIZE]; |
| msgHeader[MSG_FIELD_HUB_HANDLE] = contextHubHandle; |
| msgHeader[MSG_FIELD_APP_INSTANCE] = OS_APP_INSTANCE; |
| msgHeader[MSG_FIELD_VERSION] = 0; |
| msgHeader[MSG_FIELD_TYPE] = MSG_LOAD_NANO_APP; |
| |
| if (nativeSendMessage(msgHeader, app.getAppBinary()) != 0) { |
| return -1; |
| } |
| // Do not add an entry to mNanoAppInstance Hash yet. The HAL may reject the app |
| return 0; |
| } |
| |
| @Override |
| public int unloadNanoApp(int nanoAppInstanceHandle) throws RemoteException { |
| checkPermissions(); |
| NanoAppInstanceInfo info = mNanoAppHash.get(nanoAppInstanceHandle); |
| if (info == null) { |
| return -1; //means failed |
| } |
| |
| // Call Native interface here |
| int[] msgHeader = new int[MSG_HEADER_SIZE]; |
| msgHeader[MSG_FIELD_HUB_HANDLE] = ANY_HUB; |
| msgHeader[MSG_FIELD_APP_INSTANCE] = OS_APP_INSTANCE; |
| msgHeader[MSG_FIELD_VERSION] = 0; |
| msgHeader[MSG_FIELD_TYPE] = MSG_UNLOAD_NANO_APP; |
| |
| if(nativeSendMessage(msgHeader, null) != 0) { |
| return -1; |
| } |
| |
| // Do not add an entry to mNanoAppInstance Hash yet. The HAL may reject the app |
| return 0; |
| } |
| |
| @Override |
| public NanoAppInstanceInfo getNanoAppInstanceInfo(int nanoAppInstanceHandle) |
| throws RemoteException { |
| checkPermissions(); |
| // This assumes that all the nanoAppInfo is current. This is reasonable |
| // for the use cases for tightly controlled nanoApps. |
| if (mNanoAppHash.containsKey(nanoAppInstanceHandle)) { |
| return mNanoAppHash.get(nanoAppInstanceHandle); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public int[] findNanoAppOnHub(int hubHandle, NanoAppFilter filter) throws RemoteException { |
| checkPermissions(); |
| ArrayList<Integer> foundInstances = new ArrayList<Integer>(); |
| |
| for(Integer nanoAppInstance : mNanoAppHash.keySet()) { |
| NanoAppInstanceInfo info = mNanoAppHash.get(nanoAppInstance); |
| |
| if (filter.testMatch(info)){ |
| foundInstances.add(nanoAppInstance); |
| } |
| } |
| |
| int[] retArray = new int[foundInstances.size()]; |
| for (int i = 0; i < foundInstances.size(); i++) { |
| retArray[i] = foundInstances.get(i).intValue(); |
| } |
| |
| return retArray; |
| } |
| |
| @Override |
| public int sendMessage(int hubHandle, int nanoAppHandle, ContextHubMessage msg) |
| throws RemoteException { |
| checkPermissions(); |
| |
| int[] msgHeader = new int[MSG_HEADER_SIZE]; |
| msgHeader[MSG_FIELD_HUB_HANDLE] = hubHandle; |
| msgHeader[MSG_FIELD_APP_INSTANCE] = nanoAppHandle; |
| msgHeader[MSG_FIELD_VERSION] = msg.getVersion(); |
| msgHeader[MSG_FIELD_TYPE] = msg.getMsgType(); |
| |
| return nativeSendMessage(msgHeader, msg.getData()); |
| } |
| |
| private void checkPermissions() { |
| mContext.enforceCallingPermission(HARDWARE_PERMISSION, ENFORCE_HW_PERMISSION_MESSAGE); |
| } |
| |
| private int onMessageReceipt(int[] header, byte[] data) { |
| if (header == null || data == null || header.length < MSG_HEADER_SIZE) { |
| return -1; |
| } |
| |
| synchronized(this) { |
| if (mCallback != null) { |
| ContextHubMessage msg = new ContextHubMessage(header[MSG_FIELD_TYPE], |
| header[MSG_FIELD_VERSION], |
| data); |
| |
| try { |
| mCallback.onMessageReceipt(header[MSG_FIELD_HUB_HANDLE], |
| header[MSG_FIELD_APP_INSTANCE], |
| msg); |
| } catch (Exception e) { |
| Log.w(TAG, "Exception " + e + " when calling remote callback"); |
| return -1; |
| } |
| } else { |
| Log.d(TAG, "Message Callback is NULL"); |
| } |
| } |
| |
| return 0; |
| } |
| |
| private int addAppInstance(int hubHandle, int appInstanceHandle, long appId, int appVersion) { |
| // App Id encodes vendor & version |
| NanoAppInstanceInfo appInfo = new NanoAppInstanceInfo(); |
| |
| appInfo.setAppId(appId); |
| appInfo.setAppVersion(appVersion); |
| appInfo.setName(PRE_LOADED_APP_NAME); |
| appInfo.setContexthubId(hubHandle); |
| appInfo.setHandle(appInstanceHandle); |
| appInfo.setPublisher(PRE_LOADED_APP_PUBLISHER); |
| appInfo.setNeededExecMemBytes(PRE_LOADED_APP_MEM_REQ); |
| appInfo.setNeededReadMemBytes(PRE_LOADED_APP_MEM_REQ); |
| appInfo.setNeededWriteMemBytes(PRE_LOADED_APP_MEM_REQ); |
| |
| mNanoAppHash.put(appInstanceHandle, appInfo); |
| Log.d(TAG, "Added app instance " + appInstanceHandle + " with id " + appId |
| + " version " + appVersion); |
| |
| return 0; |
| } |
| } |