1/*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package [email protected];
18
19import IGarbageCollectCallback;
20
21/**
22 * IStorage is an interface that provides operations on underlying storage
23 * devices, including flash memory.
24 */
25interface IStorage {
26    /**
27     * Start garbage collection on the driver of storage devices.
28     *
29     * Garbage collection must be started at regular intervals when it is a good
30     * time for a longer-running cleanup tasks, roughly daily.
31     *
32     * When garbage collection finishes or encounters an error before the
33     * specified timeout, the implementation must call IGarbageCollect.finish
34     * immediately with appropriate result.
35     *
36     * If garbage collection does not finish within the specified timeout,
37     * the implementation must stop garbage collection, and must not call
38     * IGarbageCollect.finish.
39     *
40     * @param timeoutSeconds timeout in seconds. The implementation must
41     *     return after the timeout is reached.
42     *
43     * @param callback callback interface. Callback must be null if the client
44     *     does not need to receive any callbacks.
45     *
46     */
47    oneway garbageCollect(uint64_t timeoutSeconds,
48                          IGarbageCollectCallback callback);
49};
50