com.example.config.ApplicationBuilder.java Source code

Introduction

Here is the source code for com.example.config.ApplicationBuilder.java

Source

/*
 * Copyright 2016-2017 the original author or authors.
 *
 * 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 com.example.config;

import java.time.Duration;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.http.server.reactive.HttpHandler;
import org.springframework.http.server.reactive.ReactorHttpHandlerAdapter;
import org.springframework.web.server.adapter.WebHttpHandlerBuilder;

import reactor.netty.http.server.HttpServer;

/**
 * @author Dave Syer
 *
 */
public class ApplicationBuilder {

    private static final String SHUTDOWN_LISTENER = "SHUTDOWN_LISTENER";
    public static final String STARTUP = "Benchmark app started";
    private static Log logger = LogFactory.getLog(StartupApplicationListener.class);

    public static void start(ConfigurableApplicationContext context) {
        if (!hasListeners(context)) {
            ((DefaultListableBeanFactory) context.getBeanFactory()).registerDisposableBean(SHUTDOWN_LISTENER,
                    new ShutdownApplicationListener());
            new BeanCountingApplicationListener().log(context);
            logger.info(STARTUP);
        }

        HttpHandler handler = WebHttpHandlerBuilder.applicationContext(context).build();
        ReactorHttpHandlerAdapter adapter = new ReactorHttpHandlerAdapter(handler);
        HttpServer httpServer = HttpServer.create().host("localhost")
                .port(context.getEnvironment().getProperty("server.port", Integer.class, 8080)).handle(adapter);
        httpServer.bindUntilJavaShutdown(Duration.ofSeconds(60), disposable -> disposable.dispose());
    }

    private static boolean hasListeners(ConfigurableApplicationContext context) {
        if (context.getBeanNamesForType(ShutdownApplicationListener.class).length != 0) {
            return true;
        }
        if (context instanceof AbstractApplicationContext) {
            if (((AbstractApplicationContext) context).getApplicationListeners().stream()
                    .anyMatch(l -> l instanceof ShutdownApplicationListener)) {
                return true;
            }
        }
        if ((DefaultListableBeanFactory) context.getBeanFactory().getSingleton(SHUTDOWN_LISTENER) != null) {
            return true;
        }
        return false;
    }

}