com.shigengyu.hyperion.server.RestServer.java Source code

Introduction

Here is the source code for com.shigengyu.hyperion.server.RestServer.java

Source

/*******************************************************************************
 * Copyright 2013-2014 Gengyu Shi
 * 
 * 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.shigengyu.hyperion.server;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.TreeMap;

import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.Path;

import org.apache.cxf.jaxrs.JAXRSServerFactoryBean;
import org.apache.cxf.jaxrs.lifecycle.ResourceProvider;
import org.apache.cxf.jaxrs.lifecycle.SingletonResourceProvider;
import org.eclipse.jetty.http.HttpMethods;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

public class RestServer implements BeanPostProcessor {

    private static ClassPathXmlApplicationContext applicationContext;

    private static final Logger LOGGER = LoggerFactory.getLogger(RestServer.class);

    private static Collection<ControllerMethod> extractControllerMethods(
            Iterable<ResourceProvider> resourceProviders) {

        TreeMap<String, ControllerMethod> controllerMethods = Maps.newTreeMap(new Comparator<String>() {

            @Override
            public int compare(String first, String second) {
                return first.compareTo(second);
            }
        });

        for (ResourceProvider resourceProvider : resourceProviders) {
            String controllerPath = resourceProvider.getResourceClass().getAnnotation(Path.class).value();
            for (Method method : resourceProvider.getResourceClass().getMethods()) {
                if (!method.isAnnotationPresent(Path.class)) {
                    continue;
                }

                String methodPath = method.getAnnotation(Path.class).value();

                String httpMethod = null;
                if (method.isAnnotationPresent(GET.class)) {
                    httpMethod = HttpMethods.GET;
                } else if (method.isAnnotationPresent(POST.class)) {
                    httpMethod = HttpMethods.POST;
                }

                ControllerMethod controllerMethod = new ControllerMethod(httpMethod, controllerPath, methodPath);
                controllerMethods.put(controllerMethod.getUrl(), controllerMethod);
            }
        }

        return controllerMethods.values();
    }

    public static void main(final String args[]) throws Exception {

        applicationContext = new ClassPathXmlApplicationContext(
                "classpath:com/shigengyu/hyperion/config/application-context.xml");

        if (applicationContext.isActive()) {
            LOGGER.info("application-context.xml loaded");
        }

        applicationContext.getBean(RestServer.class).startServer();
    }

    private Collection<ControllerMethod> controllerMethods;

    private final List<ResourceProvider> resourceProviders = Lists.newArrayList();

    @Value("${hyperion.rest.server.host}")
    private String restServerHost;

    @Value("${hyperion.rest.server.port}")
    private int restServerPort;

    public final Collection<ControllerMethod> getControllerMethods() {
        return controllerMethods;
    }

    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (bean.getClass().isAnnotationPresent(HyperionController.class)) {
            resourceProviders.add(new SingletonResourceProvider(bean));
        }
        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    private void startServer() {
        controllerMethods = extractControllerMethods(resourceProviders);
        final JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
        sf.setResourceProviders(resourceProviders);
        final String address = "http://" + restServerHost + ":" + restServerPort + "/";
        sf.setAddress(address);
        sf.create();

        LOGGER.info("REST server started on " + address);
    }
}