| /* |
| * Copyright (C) 2021 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 com.android.net.module.util; |
| |
| import android.annotation.NonNull; |
| import android.os.Binder; |
| |
| /** |
| * Collection of utilities for {@link Binder} and related classes. |
| * @hide |
| */ |
| public class BinderUtils { |
| /** |
| * Convenience method for running the provided action enclosed in |
| * {@link Binder#clearCallingIdentity}/{@link Binder#restoreCallingIdentity} |
| * |
| * Any exception thrown by the given action will be caught and rethrown after the call to |
| * {@link Binder#restoreCallingIdentity} |
| * |
| * Note that this is copied from Binder#withCleanCallingIdentity with minor changes |
| * since it is not public. |
| * |
| * @hide |
| */ |
| public static final <T extends Exception> void withCleanCallingIdentity( |
| @NonNull ThrowingRunnable<T> action) throws T { |
| final long callingIdentity = Binder.clearCallingIdentity(); |
| try { |
| action.run(); |
| } finally { |
| Binder.restoreCallingIdentity(callingIdentity); |
| } |
| } |
| |
| /** |
| * Like a Runnable, but declared to throw an exception. |
| * |
| * @param <T> The exception class which is declared to be thrown. |
| */ |
| @FunctionalInterface |
| public interface ThrowingRunnable<T extends Exception> { |
| /** @see java.lang.Runnable */ |
| void run() throws T; |
| } |
| } |