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/*
 * Copyright 2012-2023 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * 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.aerospike.client.proxy.grpc;

import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import javax.annotation.Nonnull;

import org.checkerframework.checker.nullness.qual.NonNull;

import com.fasterxml.jackson.databind.util.ArrayIterator;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.ScheduledFuture;

/**
 * An event loop group containing a single event loop.
 * 
 * TODO: verify it is correct to delegate to the singleton event loop.
 */
class SingleEventLoopGroup implements EventLoopGroup {
	private final EventLoop eventLoop;

	SingleEventLoopGroup(EventLoop eventLoop) {
		this.eventLoop = eventLoop;
	}

	@Override
	public boolean isShuttingDown() {
		return eventLoop.isShuttingDown();
	}

	@Override
	public Future shutdownGracefully() {
		return eventLoop.shutdownGracefully();
	}

	@Override
	public Future shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
		return eventLoop.shutdownGracefully(quietPeriod, timeout, unit);
	}

	@Override
	public Future terminationFuture() {
		return eventLoop.terminationFuture();
	}

	@SuppressWarnings("deprecation")
	@Override
	public void shutdown() {
		eventLoop.shutdown();
	}

	@SuppressWarnings("deprecation")
	@Override
	public List shutdownNow() {
		return eventLoop.shutdownNow();
	}

	@Override
	public boolean isShutdown() {
		return eventLoop.isShutdown();
	}

	@Override
	public boolean isTerminated() {
		return eventLoop.isShutdown();
	}

	@Override
	public boolean awaitTermination(long timeout, @Nonnull TimeUnit unit) throws InterruptedException {
		return eventLoop.awaitTermination(timeout, unit);
	}

	@Override
	public EventLoop next() {
		return eventLoop;
	}

	@Override
	public Iterator iterator() {
		return new ArrayIterator<>(new EventExecutor[]{eventLoop});
	}

	@Override
	public Future submit(Runnable task) {
		return eventLoop.submit(task);
	}

	@NonNull
	@Override
	public  List> invokeAll(@NonNull Collection> tasks) throws InterruptedException {
		return eventLoop.invokeAll(tasks);
	}

	@NonNull
	@Override
	public  List> invokeAll(@NonNull Collection> tasks, long timeout, @NonNull TimeUnit unit) throws InterruptedException {
		return eventLoop.invokeAll(tasks, timeout, unit);
	}

	@NonNull
	@Override
	public  T invokeAny(@NonNull Collection> tasks) throws InterruptedException, ExecutionException {
		return eventLoop.invokeAny(tasks);
	}

	@Override
	public  T invokeAny(@NonNull Collection> tasks, long timeout, @NonNull TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
		return eventLoop.invokeAny(tasks, timeout, unit);
	}

	@Override
	public  Future submit(Runnable task, T result) {
		return eventLoop.submit(task, result);
	}

	@Override
	public  Future submit(Callable task) {
		return eventLoop.submit(task);
	}

	@Override
	public ScheduledFuture schedule(Runnable command, long delay, TimeUnit unit) {
		return eventLoop.schedule(command, delay, unit);
	}

	@Override
	public  ScheduledFuture schedule(Callable callable, long delay, TimeUnit unit) {
		return eventLoop.schedule(callable, delay, unit);
	}

	@Override
	public ScheduledFuture scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
		return eventLoop.scheduleAtFixedRate(command, initialDelay, period, unit);
	}

	@Override
	public ScheduledFuture scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
		return eventLoop.scheduleWithFixedDelay(command, initialDelay, delay, unit);
	}

	@Override
	public ChannelFuture register(io.netty.channel.Channel channel) {
		return eventLoop.register(channel);
	}

	@Override
	public ChannelFuture register(ChannelPromise promise) {
		return eventLoop.register(promise);
	}

	@SuppressWarnings("deprecation")
	@Override
	public ChannelFuture register(io.netty.channel.Channel channel, ChannelPromise promise) {
		return eventLoop.register(channel, promise);
	}

	@Override
	public void execute(@NonNull Runnable command) {
		eventLoop.execute(command);
	}
}