1 /* 2 * Copyright (C) 2020 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 17 package android.car.userlib; 18 19 import android.annotation.IntDef; 20 import android.annotation.Nullable; 21 22 import java.lang.annotation.Retention; 23 import java.lang.annotation.RetentionPolicy; 24 25 /** 26 * Callback used on async methods. 27 * 28 * @param <R> response type. 29 */ 30 public interface HalCallback<R> { 31 32 int STATUS_INVALID = -1; // Used for logging purposes only 33 int STATUS_OK = 1; 34 int STATUS_HAL_SET_TIMEOUT = 2; 35 int STATUS_HAL_RESPONSE_TIMEOUT = 3; 36 int STATUS_WRONG_HAL_RESPONSE = 4; 37 int STATUS_CONCURRENT_OPERATION = 5; 38 int STATUS_HAL_NOT_SUPPORTED = 6; 39 40 /** @hide */ 41 @IntDef(prefix = { "STATUS_" }, value = { 42 STATUS_OK, 43 STATUS_HAL_SET_TIMEOUT, 44 STATUS_HAL_RESPONSE_TIMEOUT, 45 STATUS_WRONG_HAL_RESPONSE, 46 STATUS_CONCURRENT_OPERATION, 47 STATUS_HAL_NOT_SUPPORTED 48 }) 49 @Retention(RetentionPolicy.SOURCE) 50 @interface HalCallbackStatus{} 51 52 /** 53 * Called when the HAL generated an event responding to that callback (or when an error 54 * occurred). 55 * 56 * @param status status of the request. 57 * @param response HAL response (or {@code null} in case of error). 58 */ onResponse(@alCallbackStatus int status, @Nullable R response)59 void onResponse(@HalCallbackStatus int status, @Nullable R response); 60 } 61