io.snice.networking.examples.echo.EchoServer Maven / Gradle / Ivy

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package io.snice.networking.examples.echo;

import io.snice.networking.app.BasicNetworkApplication;
import io.snice.networking.app.NetworkAppConfig;
import io.snice.networking.app.NetworkApplication;
import io.snice.networking.app.NetworkBootstrap;
import io.snice.networking.common.Connection;

/**
 * This is a simple echo server that deals with Strings. I.e., it expects to receive
 * {@link String} from the underlying networking stack and expects to be able to
 * send strings back to the remote party.
 *
 * Also, it does slightly more than just echo:ing back the same string it got. During the
 * {@link NetworkApplication#initialize(NetworkBootstrap)} phase, it sets up some additional
 * rules in order to lookout for some basic keywords, such as "hello" etc and only if
 * it finds to match, it has a default match-all that does the echo part.
 *
 */
public class EchoServer extends BasicNetworkApplication {

    public EchoServer() {
        super(String.class);
    }

    @Override
    public void initialize(final NetworkBootstrap, String, NetworkAppConfig> bootstrap) {
        bootstrap.onConnection(con -> true).save(c -> {
            // save the connection if we want to re-use the same one
            // without having to ask to it to be re-established (note: under the hood, it may still
            // be around and re-used but from an application point-of-view, you would have to "fetch" it again
            // by asking to have it re-established)
        }).accept(builder -> {
            builder.match(s -> s.startsWith("hello")).consume((connection, str) -> connection.send("hello world!\n"));
            builder.match(s -> true).map(String::strip).consume((c, str) -> c.send(str));
        });
    }

    public static void main(final String... args) throws Exception {
        new EchoServer().run(new NetworkAppConfig());
    }
}