com.alibaba.dubbo.rpc.protocol.http.HttpProtocol Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of dubbo2 Show documentation
The all in one project of dubbo2
The newest version!
/*
 * Copyright 1999-2012 Alibaba Group.
 *  
 * 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 pehttpssions and
 * limitations under the License.
 */
package com.alibaba.dubbo.rpc.protocol.http;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.SocketTimeoutException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.remoting.RemoteAccessException;
import org.springframework.remoting.httpinvoker.CommonsHttpInvokerRequestExecutor;
import org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean;
import org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter;
import org.springframework.remoting.httpinvoker.SimpleHttpInvokerRequestExecutor;

import com.alibaba.dubbo.common.Constants;
import com.alibaba.dubbo.common.URL;
import com.alibaba.dubbo.remoting.http.HttpBinder;
import com.alibaba.dubbo.remoting.http.HttpHandler;
import com.alibaba.dubbo.remoting.http.HttpServer;
import com.alibaba.dubbo.rpc.RpcContext;
import com.alibaba.dubbo.rpc.RpcException;
import com.alibaba.dubbo.rpc.protocol.AbstractProxyProtocol;

/**
 * HttpProtocol
 * 
 * @author william.liangf
 */
public class HttpProtocol extends AbstractProxyProtocol {

    public static final int              DEFAULT_PORT = 80;

    private final Map serverMap = new ConcurrentHashMap();

    private final Map skeletonMap = new ConcurrentHashMap();

    private HttpBinder httpBinder;
    
    public HttpProtocol() {
        super(RemoteAccessException.class);
    }

    public void setHttpBinder(HttpBinder httpBinder) {
        this.httpBinder = httpBinder;
    }

    public int getDefaultPort() {
        return DEFAULT_PORT;
    }

    private class InternalHandler implements HttpHandler {
        
        public void handle(HttpServletRequest request, HttpServletResponse response)
                throws IOException, ServletException {
            String uri = request.getRequestURI();
            HttpInvokerServiceExporter skeleton = skeletonMap.get(uri);
            if (! request.getMethod().equalsIgnoreCase("POST")) {
                response.setStatus(500);
            } else {
                RpcContext.getContext().setRemoteAddress(request.getRemoteAddr(), request.getRemotePort());
                try {
                    skeleton.handleRequest(request, response);
                } catch (Throwable e) {
                    throw new ServletException(e);
                }
            }
        }
        
    }

    protected  Runnable doExport(final T impl, Class type, URL url) throws RpcException {
        String addr = url.getIp() + ":" + url.getPort();
        HttpServer server = serverMap.get(addr);
        if (server == null) {
            server = httpBinder.bind(url, new InternalHandler());
            serverMap.put(addr, server);
        }
        final HttpInvokerServiceExporter httpServiceExporter = new HttpInvokerServiceExporter();
        httpServiceExporter.setServiceInterface(type);
        httpServiceExporter.setService(impl);
        try {
            httpServiceExporter.afterPropertiesSet();
        } catch (Exception e) {
            throw new RpcException(e.getMessage(), e);
        }
        final String path = url.getAbsolutePath();
        skeletonMap.put(path, httpServiceExporter);
        return new Runnable() {
            public void run() {
                skeletonMap.remove(path);
            }
        };
    }

    @SuppressWarnings("unchecked")
    protected  T doRefer(final Class serviceType, final URL url) throws RpcException {
        final HttpInvokerProxyFactoryBean httpProxyFactoryBean = new HttpInvokerProxyFactoryBean();
        httpProxyFactoryBean.setServiceUrl(url.toIdentityString());
        httpProxyFactoryBean.setServiceInterface(serviceType);
        String client = url.getParameter(Constants.CLIENT_KEY);
        if (client == null || client.length() == 0 || "simple".equals(client)) {
        	SimpleHttpInvokerRequestExecutor httpInvokerRequestExecutor = new SimpleHttpInvokerRequestExecutor() {
				protected void prepareConnection(HttpURLConnection con,
						int contentLength) throws IOException {
					super.prepareConnection(con, contentLength);
					con.setReadTimeout(url.getParameter(Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT));
					con.setConnectTimeout(url.getParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT));
				}
        	};
        	httpProxyFactoryBean.setHttpInvokerRequestExecutor(httpInvokerRequestExecutor);
        } else if ("commons".equals(client)) {
        	CommonsHttpInvokerRequestExecutor httpInvokerRequestExecutor = new CommonsHttpInvokerRequestExecutor();
        	httpInvokerRequestExecutor.setReadTimeout(url.getParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT));
        	httpProxyFactoryBean.setHttpInvokerRequestExecutor(httpInvokerRequestExecutor);
        } else if (client != null && client.length() > 0) {
        	throw new IllegalStateException("Unsupported http protocol client " + client + ", only supported: simple, commons");
        }
        httpProxyFactoryBean.afterPropertiesSet();
        return (T) httpProxyFactoryBean.getObject();
    }

    protected int getErrorCode(Throwable e) {
        if (e instanceof RemoteAccessException) {
            e = e.getCause();
        }
        if (e != null) {
            Class cls = e.getClass();
            // 是根据测试Case发现的问题，对RpcException.setCode进行设置
            if (SocketTimeoutException.class.equals(cls)) {
                return RpcException.TIMEOUT_EXCEPTION;
            } else if (IOException.class.isAssignableFrom(cls)) {
                return RpcException.NETWORK_EXCEPTION;
            } else if (ClassNotFoundException.class.isAssignableFrom(cls)) {
                return RpcException.SERIALIZATION_EXCEPTION;
            }
        }
        return super.getErrorCode(e);
    }

}