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/*
 * Copyright 2018 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:
 *
 *   https://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 io.netty5.microbench.channel.epoll;

import io.netty5.bootstrap.Bootstrap;
import io.netty5.bootstrap.ServerBootstrap;
import io.netty5.buffer.Buffer;
import io.netty5.channel.Channel;
import io.netty5.channel.ChannelHandler;
import io.netty5.channel.ChannelHandlerContext;
import io.netty5.channel.ChannelInitializer;
import io.netty5.channel.EventLoopGroup;
import io.netty5.channel.MultithreadEventLoopGroup;
import io.netty5.channel.epoll.EpollHandler;
import io.netty5.channel.epoll.EpollServerSocketChannel;
import io.netty5.channel.epoll.EpollSocketChannel;
import io.netty5.microbench.util.AbstractMicrobenchmark;
import io.netty5.util.concurrent.Future;
import io.netty5.util.concurrent.Promise;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.GroupThreads;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.TearDown;

import java.util.concurrent.TimeUnit;

public class EpollSocketChannelBenchmark extends AbstractMicrobenchmark {
    private static final Runnable runnable = () -> { };

    private EventLoopGroup group;
    private Channel serverChan;
    private Channel chan;
    private Buffer abyte;
    private Future future;

    @Setup
    public void setup() throws Exception {
        group = new MultithreadEventLoopGroup(1, EpollHandler.newFactory());

        // add an arbitrary timeout to make the timer reschedule
        future = group.schedule((Runnable) () -> {
            throw new AssertionError();
        }, 5, TimeUnit.MINUTES);
        serverChan = new ServerBootstrap()
                .channel(EpollServerSocketChannel.class)
                .group(group)
                .childHandler(new ChannelInitializer<>() {
                    @Override
                    protected void initChannel(Channel ch) {
                        ch.pipeline().addLast(new ChannelHandler() {
                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) {
                                if (msg instanceof Buffer) {
                                    ctx.writeAndFlush(msg);
                                } else {
                                    throw new AssertionError();
                                }
                            }
                        });
                    }
                })
                .bind(0).asStage().get();
        chan = new Bootstrap()
                .channel(EpollSocketChannel.class)
                .handler(new ChannelInitializer<>() {
                    @Override
                    protected void initChannel(Channel ch) {
                        ch.pipeline().addLast(new ChannelHandler() {

                            private Promise lastWritePromise;

                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) {
                                if (msg instanceof Buffer) {
                                    try (Buffer buf = (Buffer) msg) {
                                        if (buf.readableBytes() == 1) {
                                            lastWritePromise.trySuccess(null);
                                            lastWritePromise = null;
                                        } else {
                                            throw new AssertionError();
                                        }
                                    }
                                } else {
                                    throw new AssertionError();
                                }
                            }

                            @Override
                            public Future write(ChannelHandlerContext ctx, Object msg) {
                                if (lastWritePromise != null) {
                                    throw new IllegalStateException();
                                }
                                lastWritePromise = ctx.newPromise();
                                return ctx.write(msg);
                            }
                        });
                    }
                })
                .group(group)
                .connect(serverChan.localAddress()).asStage().get();

        abyte = chan.bufferAllocator().allocate(1);
        abyte.writeByte((byte) 'a').makeReadOnly();
    }

    @TearDown
    public void tearDown() throws Exception {
        chan.close().asStage().sync();
        serverChan.close().asStage().sync();
        future.cancel();
        group.shutdownGracefully(0, 0, TimeUnit.SECONDS).asStage().sync();
        abyte.close();
    }

    @Benchmark
    public Object pingPong() throws Exception {
        return chan.pipeline().writeAndFlush(abyte.copy(true)).asStage().sync();
    }

    @Benchmark
    public Object executeSingle() throws Exception {
        return chan.executor().submit(runnable).asStage().get();
    }

    @Benchmark
    @GroupThreads(3)
    public Object executeMulti() throws Exception {
        return chan.executor().submit(runnable).asStage().get();
    }
}