| Yifan Hong | 2cd440c | 2016-11-23 11:30:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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.hidl.base@1.0; |
| 18 | |
| 19 | /* |
| 20 | * The ancestor for all interfaces. |
| 21 | * |
| 22 | * All HAL files will have this interface implicitly imported. If an interface |
| 23 | * does not explicitly extend from another interface, it will implicitly extend |
| 24 | * from IBase. (This is like java.lang.Object in Java.) |
| 25 | * |
| 26 | * Methods defined here are shared by all interfaces (this is like |
| 27 | * java.lang.Object.notify(), for example.) However, the behavior of these |
| 28 | * functions cannot be overridden. |
| 29 | */ |
| 30 | interface IBase { |
| 31 | |
| 32 | /* |
| 33 | * Provides run-time type information for this object. |
| 34 | * For example, for the following interface definition: |
| 35 | * package android.hardware.foo@1.0; |
| 36 | * interface IParent {}; |
| 37 | * interface IChild {}; |
| 38 | * Calling interfaceChain on an IChild object will yield the following: |
| 39 | * ["android.hardware.foo@1.0::IChild", |
| 40 | * "android.hardware.foo@1.0::IParent" |
| 41 | * "android.hidl.base@1.0::IBase"] |
| 42 | * |
| 43 | * @return indicator a vector of descriptors of the run-time type of the |
| 44 | * object. |
| 45 | */ |
| 46 | interfaceChain() generates (vec<string> indicator); |
| 47 | |
| 48 | /* |
| 49 | * This method notifies the interface that one or more system properties |
| 50 | * have changed. The default implementation calls |
| 51 | * (C++) report_sysprop_change() in libcutils or |
| 52 | * (Java) android.os.SystemProperties.reportSyspropChanged, |
| 53 | * which in turn calls a set of registered callbacks (eg to update trace |
| 54 | * tags). |
| 55 | */ |
| 56 | oneway notifySyspropsChanged(); |
| 57 | }; |