| /* |
| * Copyright (C) 2017 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.locksettings.recoverablekeystore.storage; |
| |
| import android.annotation.Nullable; |
| import android.security.keystore.recovery.KeyChainSnapshot; |
| import android.util.SparseArray; |
| |
| import com.android.internal.annotations.GuardedBy; |
| |
| /** |
| * In-memory storage for recovery snapshots. |
| * |
| * <p>Recovery snapshots are generated after a successful screen unlock. They are only generated if |
| * the recoverable keystore has been mutated since the previous snapshot. This class stores only the |
| * latest snapshot for each recovery agent. |
| * |
| * <p>This class is thread-safe. It is used both on the service thread and the |
| * {@link com.android.server.locksettings.recoverablekeystore.KeySyncTask} thread. |
| */ |
| public class RecoverySnapshotStorage { |
| @GuardedBy("this") |
| private final SparseArray<KeyChainSnapshot> mSnapshotByUid = new SparseArray<>(); |
| |
| /** |
| * Sets the latest {@code snapshot} for the recovery agent {@code uid}. |
| */ |
| public synchronized void put(int uid, KeyChainSnapshot snapshot) { |
| mSnapshotByUid.put(uid, snapshot); |
| } |
| |
| /** |
| * Returns the latest snapshot for the recovery agent {@code uid}, or null if none exists. |
| */ |
| @Nullable |
| public synchronized KeyChainSnapshot get(int uid) { |
| return mSnapshotByUid.get(uid); |
| } |
| |
| /** |
| * Removes any (if any) snapshot associated with recovery agent {@code uid}. |
| */ |
| public synchronized void remove(int uid) { |
| mSnapshotByUid.remove(uid); |
| } |
| } |