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/*
* 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;
import java.util.function.Supplier;
/**
* 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;
}
/**
* Convenience method for running the provided action enclosed in
* {@link Binder#clearCallingIdentity}/{@link Binder#restoreCallingIdentity} returning the
* result.
*
* <p>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, E extends Exception> T withCleanCallingIdentity(
@NonNull ThrowingSupplier<T, E> action) throws E {
final long callingIdentity = Binder.clearCallingIdentity();
try {
return action.get();
} finally {
Binder.restoreCallingIdentity(callingIdentity);
}
}
/**
* An equivalent of {@link Supplier}
*
* @param <T> The class which is declared to be returned.
* @param <E> The exception class which is declared to be thrown.
*/
@FunctionalInterface
public interface ThrowingSupplier<T, E extends Exception> {
/** @see java.util.function.Supplier */
T get() throws E;
}
}
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