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/*
* Copyright (C) 2014 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.launcher3.pm;
import android.content.Context;
import android.content.Intent;
import android.os.UserHandle;
import android.os.UserManager;
import android.util.ArrayMap;
import android.util.LongSparseArray;
import com.android.launcher3.util.MainThreadInitializedObject;
import com.android.launcher3.util.SafeCloseable;
import com.android.launcher3.util.SimpleBroadcastReceiver;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* Class which manages a local cache of user handles to avoid system rpc
*/
public class UserCache {
public static final MainThreadInitializedObject<UserCache> INSTANCE =
new MainThreadInitializedObject<>(UserCache::new);
private final Context mContext;
private final UserManager mUserManager;
private final ArrayList<Runnable> mUserChangeListeners = new ArrayList<>();
private final SimpleBroadcastReceiver mUserChangeReceiver =
new SimpleBroadcastReceiver(this::onUsersChanged);
private LongSparseArray<UserHandle> mUsers;
// Create a separate reverse map as LongSparseArray.indexOfValue checks if objects are same
// and not {@link Object#equals}
private ArrayMap<UserHandle, Long> mUserToSerialMap;
private UserCache(Context context) {
mContext = context;
mUserManager = context.getSystemService(UserManager.class);
}
private void onUsersChanged(Intent intent) {
enableAndResetCache();
mUserChangeListeners.forEach(Runnable::run);
}
/**
* Adds a listener for user additions and removals
*/
public SafeCloseable addUserChangeListener(Runnable command) {
synchronized (this) {
if (mUserChangeListeners.isEmpty()) {
// Enable caching and start listening for user broadcast
mUserChangeReceiver.register(mContext,
Intent.ACTION_MANAGED_PROFILE_ADDED,
Intent.ACTION_MANAGED_PROFILE_REMOVED);
enableAndResetCache();
}
mUserChangeListeners.add(command);
return () -> removeUserChangeListener(command);
}
}
private void enableAndResetCache() {
synchronized (this) {
mUsers = new LongSparseArray<>();
mUserToSerialMap = new ArrayMap<>();
List<UserHandle> users = mUserManager.getUserProfiles();
if (users != null) {
for (UserHandle user : users) {
long serial = mUserManager.getSerialNumberForUser(user);
mUsers.put(serial, user);
mUserToSerialMap.put(user, serial);
}
}
}
}
private void removeUserChangeListener(Runnable command) {
synchronized (this) {
mUserChangeListeners.remove(command);
if (mUserChangeListeners.isEmpty()) {
// Disable cache and stop listening
mContext.unregisterReceiver(mUserChangeReceiver);
mUsers = null;
mUserToSerialMap = null;
}
}
}
/**
* @see UserManager#getSerialNumberForUser(UserHandle)
*/
public long getSerialNumberForUser(UserHandle user) {
synchronized (this) {
if (mUserToSerialMap != null) {
Long serial = mUserToSerialMap.get(user);
return serial == null ? 0 : serial;
}
}
return mUserManager.getSerialNumberForUser(user);
}
/**
* @see UserManager#getUserForSerialNumber(long)
*/
public UserHandle getUserForSerialNumber(long serialNumber) {
synchronized (this) {
if (mUsers != null) {
return mUsers.get(serialNumber);
}
}
return mUserManager.getUserForSerialNumber(serialNumber);
}
/**
* @see UserManager#getUserProfiles()
*/
public List<UserHandle> getUserProfiles() {
synchronized (this) {
if (mUsers != null) {
return new ArrayList<>(mUserToSerialMap.keySet());
}
}
List<UserHandle> users = mUserManager.getUserProfiles();
return users == null ? Collections.emptyList() : users;
}
}
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