package com.maartenvolders.samples.gwt.inlinepreserializedpayload.server;

import com.google.gwt.user.client.rpc.SerializationException;
import com.google.gwt.user.server.rpc.RPC;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.velocity.context.Context;
import org.apache.velocity.tools.view.VelocityViewServlet;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;

/**
 * Author: maarten@maartenvolders.com
 */
public class DemoVelocityViewServlet extends VelocityViewServlet {

    private final Log log = LogFactory.getLog("DemoVelocityViewServlet");

    private static final String PAYLOAD_METHOD = "getSystemInfo";
    private static final String PAYLOAD_ID = "payload";

    @Override
    protected void fillContext(Context context, HttpServletRequest request) {
        try {
            Method method = DemoServiceImpl.class.getMethod(PAYLOAD_METHOD);
            String result = new DemoServiceImpl().getSystemInfo();
            String payload = RPC.encodeResponseForSuccess(method, result);
            context.put(PAYLOAD_ID, payload);
            log.info("Preserialized payload added to context: " + payload);
        } catch (NoSuchMethodException nsme) {
            log.error("Payload preserialization failed", nsme);
        } catch (SerializationException se) {
            log.error("Payload preserialization failed", se);
        }
    }
}