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/*
* Copyright 2015 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.server.camera;
import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.UserInfo;
import android.hardware.ICameraService;
import android.hardware.ICameraServiceProxy;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.UserManager;
import com.android.server.SystemService;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* CameraService is the system_server analog to the camera service running in mediaserver.
*
* @hide
*/
public class CameraService extends SystemService {
/**
* This must match the ICameraService.aidl definition
*/
private static final String CAMERA_SERVICE_BINDER_NAME = "media.camera";
public static final String CAMERA_SERVICE_PROXY_BINDER_NAME = "media.camera.proxy";
// Event arguments to use with the camera service notifySystemEvent call:
public static final int NO_EVENT = 0; // NOOP
public static final int USER_SWITCHED = 1; // User changed, argument is the new user handle
private final Context mContext;
private UserManager mUserManager;
private final Object mLock = new Object();
private Set<Integer> mEnabledCameraUsers;
private final ICameraServiceProxy.Stub mCameraServiceProxy = new ICameraServiceProxy.Stub() {
@Override
public void pingForUserUpdate() {
// Binder call
synchronized(mLock) {
if (mEnabledCameraUsers != null) {
notifyMediaserver(USER_SWITCHED, mEnabledCameraUsers);
}
}
}
};
public CameraService(Context context) {
super(context);
mContext = context;
}
@Override
public void onStart() {
mUserManager = UserManager.get(mContext);
if (mUserManager == null) {
// Should never see this unless someone messes up the SystemServer service boot order.
throw new IllegalStateException("UserManagerService must start before CameraService!");
}
publishBinderService(CAMERA_SERVICE_PROXY_BINDER_NAME, mCameraServiceProxy);
}
@Override
public void onStartUser(int userHandle) {
synchronized(mLock) {
if (mEnabledCameraUsers == null) {
// Initialize mediaserver, or update mediaserver if we are recovering from a crash.
switchUserLocked(userHandle);
}
}
}
@Override
public void onSwitchUser(int userHandle) {
synchronized(mLock) {
switchUserLocked(userHandle);
}
}
private void switchUserLocked(int userHandle) {
Set<Integer> currentUserHandles = getEnabledUserHandles(userHandle);
if (mEnabledCameraUsers == null || !mEnabledCameraUsers.equals(currentUserHandles)) {
// Some user handles have been added or removed, update mediaserver.
mEnabledCameraUsers = currentUserHandles;
notifyMediaserver(USER_SWITCHED, currentUserHandles);
}
}
private Set<Integer> getEnabledUserHandles(int currentUserHandle) {
List<UserInfo> userProfiles = mUserManager.getEnabledProfiles(currentUserHandle);
Set<Integer> handles = new HashSet<>(userProfiles.size());
for (UserInfo i : userProfiles) {
handles.add(i.id);
}
return handles;
}
private void notifyMediaserver(int eventType, Set<Integer> updatedUserHandles) {
// Forward the user switch event to the native camera service running in the mediaserver
// process.
IBinder cameraServiceBinder = getBinderService(CAMERA_SERVICE_BINDER_NAME);
if (cameraServiceBinder == null) {
return; // Camera service not active, cannot evict user clients.
}
ICameraService cameraServiceRaw = ICameraService.Stub.asInterface(cameraServiceBinder);
try {
cameraServiceRaw.notifySystemEvent(eventType, toArray(updatedUserHandles));
} catch (RemoteException e) {
// Not much we can do if camera service is dead.
}
}
private static int[] toArray(Collection<Integer> c) {
int len = c.size();
int[] ret = new int[len];
int idx = 0;
for (Integer i : c) {
ret[idx++] = i;
}
return ret;
}
}
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