org.apache.servicecomb.springboot2.starter.servlet.RestServletInitializer.java Source code

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Here is the source code for org.apache.servicecomb.springboot2.starter.servlet.RestServletInitializer.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *     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 org.apache.servicecomb.springboot2.starter.servlet;

import java.io.IOException;
import java.net.ServerSocket;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.apache.commons.configuration.Configuration;
import org.apache.servicecomb.transport.rest.servlet.ServletConfig;
import org.apache.servicecomb.transport.rest.servlet.ServletUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.server.AbstractConfigurableWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.boot.web.servlet.ServletContextInitializer;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import com.netflix.config.DynamicPropertyFactory;

@Component
public class RestServletInitializer
        implements WebServerFactoryCustomizer<AbstractConfigurableWebServerFactory>, ServletContextInitializer {
    private static final Logger LOGGER = LoggerFactory.getLogger(RestServletInitializer.class);

    private AbstractConfigurableWebServerFactory factory;

    @Override
    public void customize(AbstractConfigurableWebServerFactory factory) {
        this.factory = factory;
    }

    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        if (factory.getPort() == 0) {
            LOGGER.warn(
                    "spring boot embed web container listen port is 0, serviceComb will not use container's port to handler RESTful request.");
            return;
        }

        // web container did not did listen now.
        // so mock to listen, and then close.
        try (ServerSocket ss = new ServerSocket(factory.getPort(), 0, factory.getAddress())) {
            if (StringUtils.isEmpty(ServletConfig.getServletUrlPattern())) {
                // ensure the servlet will be instantiated
                Configuration configuration = (Configuration) DynamicPropertyFactory
                        .getBackingConfigurationSource();
                configuration.setProperty(ServletConfig.KEY_SERVLET_URL_PATTERN, ServletConfig.DEFAULT_URL_PATTERN);
            }

            ServletUtils.init(servletContext);
        } catch (IOException e) {
            throw new ServletException(e);
        }
    }
}