HotRodRouter.java example

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infinispan-master
package org.infinispan.server.router.router.impl.hotrod;

import java.lang.invoke.MethodHandles;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;

import org.infinispan.commons.logging.LogFactory;
import org.infinispan.server.router.RoutingTable;
import org.infinispan.server.router.configuration.HotRodRouterConfiguration;
import org.infinispan.server.router.logging.RouterLogger;
import org.infinispan.server.router.router.Router;
import org.infinispan.server.router.router.impl.hotrod.handlers.SniHandlerInitializer;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.util.concurrent.DefaultThreadFactory;
import io.netty.util.concurrent.Future;

/**
 * {@link Router} implementation for Hot Rod.
 *
 * @author Sebastian Łaskawiec
 */
public class HotRodRouter implements Router {

    private static final RouterLogger logger = LogFactory.getLog(MethodHandles.lookup().lookupClass(), RouterLogger.class);

    private static final String THREAD_NAME_PREFIX = "MultiTenantRouter";

    private final NioEventLoopGroup masterGroup = new NioEventLoopGroup(1, new DefaultThreadFactory(THREAD_NAME_PREFIX + "-ServerMaster"));
    private final NioEventLoopGroup workerGroup = new NioEventLoopGroup(0, new DefaultThreadFactory(THREAD_NAME_PREFIX + "-ServerWorker"));
    private final HotRodRouterConfiguration configuration;
    private Optional<Integer> port = Optional.empty();
    private Optional<InetAddress> ip = Optional.empty();

    public HotRodRouter(HotRodRouterConfiguration configuration) {
        this.configuration = configuration;
    }

    @Override
    public void start(RoutingTable routingTable) {
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(masterGroup, workerGroup)
                    .childOption(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                    .childOption(ChannelOption.TCP_NODELAY, configuration.tcpNoDelay())
                    .childOption(ChannelOption.SO_KEEPALIVE, configuration.keepAlive())
                    .childHandler(new SniHandlerInitializer(routingTable))
                    .channel(NioServerSocketChannel.class);
            if (configuration.sendBufferSize() > 0)
                bootstrap.childOption(ChannelOption.SO_SNDBUF, configuration.sendBufferSize());
            if (configuration.receiveBufferSize() > 0)
                bootstrap.childOption(ChannelOption.SO_RCVBUF, configuration.receiveBufferSize());

            InetAddress ip = configuration.getIp();
            int port = configuration.getPort();

            Channel channel = bootstrap.bind(ip, port).sync().channel();
            InetSocketAddress localAddress = (InetSocketAddress) channel.localAddress();
            this.port = Optional.of(localAddress.getPort());
            this.ip = Optional.of(localAddress.getAddress());
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } catch (Exception e) {
            throw logger.hotrodRouterStartFailed(e);
        }

        logger.hotRodRouterStarted(ip + ":" + port);
    }

    @Override
    public void stop() {
        CompletableFuture<?> masterGroupShutdown = wrapShutdownFuture(masterGroup.shutdownGracefully());
        CompletableFuture<?> workerGroupShutdown = wrapShutdownFuture(workerGroup.shutdownGracefully());
        try {
            CompletableFuture.allOf(masterGroupShutdown, workerGroupShutdown).get();
        } catch (Exception e) {
            logger.errorWhileShuttingDown(e);
        }
        port = Optional.empty();
        ip = Optional.empty();
    }

    @Override
    public Optional<InetAddress> getIp() {
        return ip;
    }

    @Override
    public Optional<Integer> getPort() {
        return port;
    }

    @Override
    public Protocol getProtocol() {
        return Protocol.HOT_ROD;
    }

    private <U> CompletableFuture<U> wrapShutdownFuture(Future<U> shutdownFuture) {
        return CompletableFuture.supplyAsync(() -> {
            try {
                return shutdownFuture.get();
            } catch (Exception e) {
                throw new IllegalStateException(e);
            }
        });
    }
}