package cz.znj.kvr.sw.exp.java.netty.netty;

/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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.
 */

import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelHandlerInvoker;
import io.netty.channel.ChannelPromise;
import io.netty.channel.DefaultChannelPromise;
import io.netty.channel.EventLoop;
import io.netty.channel.EventLoopGroup;
import io.netty.util.concurrent.AbstractScheduledEventExecutor;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;

import java.net.SocketAddress;
import java.util.ArrayDeque;
import java.util.Queue;
import java.util.concurrent.TimeUnit;

import static io.netty.channel.ChannelHandlerInvokerUtil.invokeBindNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelActiveNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelInactiveNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelReadCompleteNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelReadNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelRegisteredNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelUnregisteredNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeChannelWritabilityChangedNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeCloseNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeConnectNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeDeregisterNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeDisconnectNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeExceptionCaughtNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeFlushNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeReadNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeUserEventTriggeredNow;
import static io.netty.channel.ChannelHandlerInvokerUtil.invokeWriteNow;


public final class MyEmbeddedEventLoop extends AbstractScheduledEventExecutor implements ChannelHandlerInvoker, EventLoop
{
	public static MyEmbeddedEventLoop getInstance()
	{
		return instance;
	}

	private static MyEmbeddedEventLoop instance = new MyEmbeddedEventLoop();

	private final Queue<Runnable> tasks = new ArrayDeque<Runnable>(2);

	@Override
	public EventLoop unwrap() {
		return this;
	}

	@Override
	public EventLoopGroup parent() {
		return (EventLoopGroup) super.parent();
	}

	@Override
	public EventLoop next() {
		return (EventLoop) super.next();
	}

	@Override
	public void execute(Runnable command) {
		if (command == null) {
			throw new NullPointerException("command");
		}
		tasks.add(command);
	}

	void runTasks() {
		for (;;) {
			Runnable task = tasks.poll();
			if (task == null) {
				break;
			}

			task.run();
		}
	}

	long runScheduledTasks() {
		long time = AbstractScheduledEventExecutor.nanoTime();
		for (;;) {
			Runnable task = pollScheduledTask(time);
			if (task == null) {
				return nextScheduledTaskNano();
			}

			task.run();
		}
	}

	long nextScheduledTask() {
		return nextScheduledTaskNano();
	}

	@Override
	protected void cancelScheduledTasks() {
		super.cancelScheduledTasks();
	}

	@Override
	public Future<?> shutdownGracefully(long quietPeriod, long timeout, TimeUnit unit) {
		throw new UnsupportedOperationException();
	}

	@Override
	public Future<?> terminationFuture() {
		throw new UnsupportedOperationException();
	}

	@Override
	@Deprecated
	public void shutdown() {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean isShuttingDown() {
		return false;
	}

	@Override
	public boolean isShutdown() {
		return false;
	}

	@Override
	public boolean isTerminated() {
		return false;
	}

	@Override
	public boolean awaitTermination(long timeout, TimeUnit unit) {
		return false;
	}

	@Override
	public ChannelFuture register(Channel channel) {
		return register(channel, new DefaultChannelPromise(channel, this));
	}

	@Override
	public ChannelFuture register(Channel channel, ChannelPromise promise) {
		channel.unsafe().register(this, promise);
		return promise;
	}

	@Override
	public boolean inEventLoop() {
		return true;
	}

	@Override
	public boolean inEventLoop(Thread thread) {
		return true;
	}

	@Override
	public ChannelHandlerInvoker asInvoker() {
		return this;
	}

	@Override
	public EventExecutor executor() {
		return this;
	}

	@Override
	public void invokeChannelRegistered(ChannelHandlerContext ctx) {
		invokeChannelRegisteredNow(ctx);
	}

	@Override
	public void invokeChannelUnregistered(ChannelHandlerContext ctx) {
		invokeChannelUnregisteredNow(ctx);
	}

	@Override
	public void invokeChannelActive(ChannelHandlerContext ctx) {
		invokeChannelActiveNow(ctx);
	}

	@Override
	public void invokeChannelInactive(ChannelHandlerContext ctx) {
		invokeChannelInactiveNow(ctx);
	}

	@Override
	public void invokeExceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
		invokeExceptionCaughtNow(ctx, cause);
	}

	@Override
	public void invokeUserEventTriggered(ChannelHandlerContext ctx, Object event) {
		invokeUserEventTriggeredNow(ctx, event);
	}

	@Override
	public void invokeChannelRead(ChannelHandlerContext ctx, Object msg) {
		invokeChannelReadNow(ctx, msg);
	}

	@Override
	public void invokeChannelReadComplete(ChannelHandlerContext ctx) {
		invokeChannelReadCompleteNow(ctx);
	}

	@Override
	public void invokeChannelWritabilityChanged(ChannelHandlerContext ctx) {
		invokeChannelWritabilityChangedNow(ctx);
	}

	@Override
	public void invokeBind(ChannelHandlerContext ctx, SocketAddress localAddress, ChannelPromise promise) {
		invokeBindNow(ctx, localAddress, promise);
	}

	@Override
	public void invokeConnect(
		ChannelHandlerContext ctx,
		SocketAddress remoteAddress, SocketAddress localAddress, ChannelPromise promise) {
		invokeConnectNow(ctx, remoteAddress, localAddress, promise);
	}

	@Override
	public void invokeDisconnect(ChannelHandlerContext ctx, ChannelPromise promise) {
		invokeDisconnectNow(ctx, promise);
	}

	@Override
	public void invokeClose(ChannelHandlerContext ctx, ChannelPromise promise) {
		invokeCloseNow(ctx, promise);
	}

	@Override
	public void invokeDeregister(ChannelHandlerContext ctx, final ChannelPromise promise) {
		invokeDeregisterNow(ctx, promise);
	}

	@Override
	public void invokeRead(ChannelHandlerContext ctx) {
		invokeReadNow(ctx);
	}

	@Override
	public void invokeWrite(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) {
		invokeWriteNow(ctx, msg, promise);
	}

	@Override
	public void invokeFlush(ChannelHandlerContext ctx) {
		invokeFlushNow(ctx);
	}
}
