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/*
* Copyright © 2018 Samuel Holland <samuel@sholland.org>
* Copyright © 2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.util;
import android.os.Handler;
import java.util.concurrent.Executor;
import java9.util.concurrent.CompletableFuture;
import java9.util.concurrent.CompletionStage;
/**
* Helper class for running asynchronous tasks and ensuring they are completed on the main thread.
*/
public class AsyncWorker {
private final Executor executor;
private final Handler handler;
public AsyncWorker(final Executor executor, final Handler handler) {
this.executor = executor;
this.handler = handler;
}
public CompletionStage<Void> runAsync(final AsyncRunnable<?> runnable) {
final CompletableFuture<Void> future = new CompletableFuture<>();
executor.execute(() -> {
try {
runnable.run();
handler.post(() -> future.complete(null));
} catch (final Throwable t) {
handler.post(() -> future.completeExceptionally(t));
}
});
return future;
}
public <T> CompletionStage<T> supplyAsync(final AsyncSupplier<T, ?> supplier) {
final CompletableFuture<T> future = new CompletableFuture<>();
executor.execute(() -> {
try {
final T result = supplier.get();
handler.post(() -> future.complete(result));
} catch (final Throwable t) {
handler.post(() -> future.completeExceptionally(t));
}
});
return future;
}
@FunctionalInterface
public interface AsyncRunnable<E extends Throwable> {
void run() throws E;
}
@FunctionalInterface
public interface AsyncSupplier<T, E extends Throwable> {
T get() throws E;
}
}
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