| /* |
| * Copyright (C) 2011 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.util; |
| |
| import android.compat.annotation.UnsupportedAppUsage; |
| |
| /** |
| * Interface that provides trusted time information, possibly coming from an NTP |
| * server. Implementations may cache answers until {@link #forceRefresh()}. |
| * |
| * @hide |
| */ |
| public interface TrustedTime { |
| /** |
| * Force update with an external trusted time source, returning {@code true} |
| * when successful. |
| */ |
| @UnsupportedAppUsage |
| public boolean forceRefresh(); |
| |
| /** |
| * Check if this instance has cached a response from a trusted time source. |
| */ |
| @UnsupportedAppUsage |
| public boolean hasCache(); |
| |
| /** |
| * Return time since last trusted time source contact, or |
| * {@link Long#MAX_VALUE} if never contacted. |
| */ |
| @UnsupportedAppUsage |
| public long getCacheAge(); |
| |
| /** |
| * Return certainty of cached trusted time in milliseconds, or |
| * {@link Long#MAX_VALUE} if never contacted. Smaller values are more |
| * precise. |
| */ |
| public long getCacheCertainty(); |
| |
| /** |
| * Return current time similar to {@link System#currentTimeMillis()}, |
| * possibly using a cached authoritative time source. |
| */ |
| @UnsupportedAppUsage |
| public long currentTimeMillis(); |
| } |