Proxies.java

package org.genedb.crawl.dao.proxy;

import java.io.IOException;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.ArrayUtils;
import org.apache.log4j.Logger;
import org.codehaus.jackson.type.JavaType;
import org.genedb.crawl.CrawlException;
import org.genedb.crawl.client.CrawlClient;
import org.springframework.util.Assert;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public class Proxies {
    
    static Logger logger = Logger.getLogger(Proxies.class);
    private static String[] resources;

    public String[] getResources() {
        return resources;
    }

    public void setResources(String[] resources) {
        logger.info("setting resources");
        logger.info(resources);
        Proxies.resources = resources;
    }
    
    public static <T extends Object> T proxyRequest(JavaType type) throws CrawlException {
        
        RequestAttributes attrs = RequestContextHolder.getRequestAttributes();
        Assert.isInstanceOf(ServletRequestAttributes.class, attrs);
        ServletRequestAttributes servletAttrs = (ServletRequestAttributes) attrs;
        HttpServletRequest request = servletAttrs.getRequest();
        
        @SuppressWarnings("unchecked")
        Map<String, String[]> parameters = request.getParameterMap();
        
        String[] uriSplit = request.getRequestURI().split("/");
        ArrayUtils.reverse(uriSplit);
        
        String method = uriSplit[0];
        String resource = uriSplit[1];
        
        String dot = ".";
        int dotPos = method.indexOf(dot);
        
        if (dotPos > 0)
            method = method.substring(0, dotPos);
        
        for (String url : resources) {
            
            logger.info(url + " - " + resource + " - " + method);
            
            CrawlClient client = new CrawlClient(url);
            
            try {
                
                T result = (T) client.request(type, resource, method, parameters);
                if (result != null) {
                    logger.info(type + " -- " + result.getClass());
                    logger.info("found result, returning");
                    return result;
                }
                    
            } catch (IOException e) {
                throw new RuntimeException(e);
            } catch (CrawlException e) {
                throw (e);
            }
            
        }
        
        return null;
    }
    
}