io.reactivesocket.netty.tcp.server.ReactiveSocketServerHandler.java Source code

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Here is the source code for io.reactivesocket.netty.tcp.server.ReactiveSocketServerHandler.java

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/**
 * Copyright 2015 Netflix, Inc.
 *
 * 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 io.reactivesocket.netty.tcp.server;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelId;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.reactivesocket.ConnectionSetupHandler;
import io.reactivesocket.DefaultReactiveSocket;
import io.reactivesocket.Frame;
import io.reactivesocket.LeaseGovernor;
import io.reactivesocket.ReactiveSocket;
import io.reactivesocket.netty.MutableDirectByteBuf;
import org.agrona.BitUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ConcurrentHashMap;

@ChannelHandler.Sharable
public class ReactiveSocketServerHandler extends ChannelInboundHandlerAdapter {
    private Logger logger = LoggerFactory.getLogger(ReactiveSocketServerHandler.class);

    private ConcurrentHashMap<ChannelId, ServerTcpDuplexConnection> duplexConnections = new ConcurrentHashMap<>();

    private ConnectionSetupHandler setupHandler;

    private LeaseGovernor leaseGovernor;

    protected ReactiveSocketServerHandler(ConnectionSetupHandler setupHandler, LeaseGovernor leaseGovernor) {
        this.setupHandler = setupHandler;
        this.leaseGovernor = leaseGovernor;
    }

    public static ReactiveSocketServerHandler create(ConnectionSetupHandler setupHandler) {
        return create(setupHandler, LeaseGovernor.UNLIMITED_LEASE_GOVERNOR);
    }

    public static ReactiveSocketServerHandler create(ConnectionSetupHandler setupHandler,
            LeaseGovernor leaseGovernor) {
        return new ReactiveSocketServerHandler(setupHandler, leaseGovernor);

    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        ChannelPipeline cp = ctx.pipeline();
        if (cp.get(LengthFieldBasedFrameDecoder.class) == null) {
            ctx.pipeline().addBefore(ctx.name(), LengthFieldBasedFrameDecoder.class.getName(),
                    new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE >> 1, 0, BitUtil.SIZE_OF_INT,
                            -1 * BitUtil.SIZE_OF_INT, 0));
        }

    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        ByteBuf content = (ByteBuf) msg;
        try {
            MutableDirectByteBuf mutableDirectByteBuf = new MutableDirectByteBuf(content);
            Frame from = Frame.from(mutableDirectByteBuf, 0, mutableDirectByteBuf.capacity());
            channelRegistered(ctx);
            ServerTcpDuplexConnection connection = duplexConnections.computeIfAbsent(ctx.channel().id(), i -> {
                logger.info("No connection found for channel id: " + i + " from host "
                        + ctx.channel().remoteAddress().toString());
                ServerTcpDuplexConnection c = new ServerTcpDuplexConnection(ctx);
                ReactiveSocket reactiveSocket = DefaultReactiveSocket.fromServerConnection(c, setupHandler,
                        leaseGovernor, throwable -> throwable.printStackTrace());
                reactiveSocket.startAndWait();
                return c;
            });
            if (connection != null) {
                connection.getSubscribers().forEach(o -> o.onNext(from));
            }
        } finally {
            content.release();
        }
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        super.exceptionCaught(ctx, cause);

        logger.error("caught an unhandled exception", cause);
    }
}