package net.helipilot50.stocktrade.server;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;
import com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.server.rpc.RPC;
import com.google.gwt.user.server.rpc.RPCRequest;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
@SuppressWarnings("serial")
public class SpringGwtRemoteServiceServlet extends RemoteServiceServlet {
private static final Logger LOG = Logger.getLogger(SpringGwtRemoteServiceServlet.class);
@Override
public void init() {
if (LOG.isDebugEnabled()) {
LOG.debug("Spring GWT service exporter deployed");
}
}
@Override
public String processCall(String payload) throws SerializationException {
try {
Object handler = getBean(getThreadLocalRequest());
RPCRequest rpcRequest = RPC.decodeRequest(payload, handler.getClass(), this);
onAfterRequestDeserialized(rpcRequest);
if (LOG.isDebugEnabled()) {
LOG.debug("Invoking " + handler.getClass().getName() + "." + rpcRequest.getMethod().getName());
}
return RPC.invokeAndEncodeResponse(handler, rpcRequest.getMethod(), rpcRequest.getParameters(), rpcRequest
.getSerializationPolicy());
} catch (IncompatibleRemoteServiceException ex) {
log("An IncompatibleRemoteServiceException was thrown while processing this call.", ex);
return RPC.encodeResponseForFailure(null, ex);
}
}
/**
* Determine Spring bean to handle request based on request URL, e.g. a
* request ending in /myService will be handled by bean with name
* "myService".
*
* @param request
* @return handler bean
*/
protected Object getBean(HttpServletRequest request) {
String service = getService(request);
Object bean = getBean(service);
if (!(bean instanceof RemoteService)) {
throw new IllegalArgumentException("Spring bean is not a GWT RemoteService: " + service + " (" + bean + ")");
}
if (LOG.isDebugEnabled()) {
LOG.debug("Bean for service " + service + " is " + bean);
}
return bean;
}
/**
* Parse the service name from the request URL.
*
* @param request
* @return bean name
*/
protected String getService(HttpServletRequest request) {
String url = request.getRequestURI();
String service = url.substring(url.lastIndexOf("/") + 1);
if (LOG.isDebugEnabled()) {
LOG.debug("Service for URL " + url + " is " + service);
}
return service;
}
/**
* Look up a spring bean with the specified name in the current web
* application context.
*
* @param name
* bean name
* @return the bean
*/
protected Object getBean(String name) {
WebApplicationContext applicationContext = WebApplicationContextUtils
.getWebApplicationContext(getServletContext());
if (applicationContext == null) {
throw new IllegalStateException("No Spring web application context found");
}
if (!applicationContext.containsBean(name)) {
{
throw new IllegalArgumentException("Spring bean not found: " + name);
}
}
return applicationContext.getBean(name);
}
}