1/*
2 * Copyright (C) 2017 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 android.hardware.neuralnetworks@1.0;
18
19import IExecutionCallback;
20
21/**
22 * IPreparedModel describes a model that has been prepared for execution and
23 * is used to launch executions.
24 */
25interface IPreparedModel {
26    /**
27     * Launches an asynchronous execution on a prepared model.
28     *
29     * The execution is performed asynchronously with respect to the caller.
30     * execute must verify the inputs to the function are correct. If there is
31     * an error, execute must immediately invoke the callback with the
32     * appropriate ErrorStatus value, then return with the same ErrorStatus. If
33     * the inputs to the function are valid and there is no error, execute must
34     * launch an asynchronous task to perform the execution in the background,
35     * and immediately return with ErrorStatus::NONE. If the asynchronous task
36     * fails to launch, execute must immediately invoke the callback with
37     * ErrorStatus::GENERAL_FAILURE, then return with
38     * ErrorStatus::GENERAL_FAILURE.
39     *
40     * When the asynchronous task has finished its execution, it must
41     * immediately invoke the callback object provided as an input to the
42     * execute function. This callback must be provided with the ErrorStatus of
43     * the execution.
44     *
45     * Multiple threads can call the execute function on the same IPreparedModel
46     * object concurrently with different requests.
47     *
48     * @param request The input and output information on which the prepared
49     *                model is to be executed.
50     * @param callback A callback object used to return the error status of
51     *                 the execution. The callback object's notify function must
52     *                 be called exactly once, even if the execution was
53     *                 unsuccessful.
54     * @return status Error status of the call, must be:
55     *                - NONE if task is successfully launched
56     *                - DEVICE_UNAVAILABLE if driver is offline or busy
57     *                - GENERAL_FAILURE if there is an unspecified error
58     *                - OUTPUT_INSUFFICIENT_SIZE if provided output buffer is
59     *                  not large enough to store the resultant values
60     *                - INVALID_ARGUMENT if one of the input arguments is
61     *                  invalid
62     */
63    execute(Request request, IExecutionCallback callback)
64        generates (ErrorStatus status);
65};
66