VRaptor + MongoDb

package com.noname.dao;

import java.util.List;

import br.com.caelum.vraptor.ioc.Component;

import com.google.code.morphia.Datastore;
import com.google.code.morphia.Morphia;
import com.google.code.morphia.query.Query;
import com.mongodb.Mongo;

@Component
public class ConexaoDao {
	
	private static ConexaoDao myInstance = null;

	private Mongo mongo = null;
	private static Datastore datastore = null;
	
	private ConexaoDao() throws Exception {
		mongo = new Mongo();
		datastore = new Morphia().createDatastore(mongo, "noname");
		datastore.ensureIndexes();
	}
	
	public synchronized static ConexaoDao getInstance() throws Exception{
		if(myInstance == null){
			myInstance = new ConexaoDao();
		}
		return myInstance;
	}
	
	public Datastore getDatastore() throws Exception{
		if(datastore == null){
			getInstance();
		}
		return datastore;
	}

		
	public Object save(Object object){
		datastore.save(object);
		return object;
	}
}

package com.noname.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import static br.com.caelum.vraptor.view.Results.json;
import br.com.caelum.vraptor.Get;
import br.com.caelum.vraptor.Path;
import br.com.caelum.vraptor.Resource;
import br.com.caelum.vraptor.Result;

import com.google.code.morphia.Datastore;
import com.noname.dao.ConexaoDao;
import com.noname.entity.Product;

@Resource
public class ProductController {

	@Autowired
	private Result result;
	private Datastore ds;
	
	private void abreConexao() throws Exception{
		ds = ConexaoDao.getInstance().getDatastore();		
	}
	
	@Get
	@Path("/product/getProduct")
	public void getProduct(String nmProduct) throws Exception{
		abreConexao();
		List<Product> productList = ds.createQuery(Product.class).field("nmProduct").containsIgnoreCase(nmProduct).asList();
		result.use(json()).from(productList, "productList").serialize();
	}
	
	@Get
	@Path("/product/addProduct")
	public void addProduct(String nmProduct) throws Exception{
		abreConexao();
		Product product = null;
		if(nmProduct == null){
			throw new Exception("Product name cannot be null");
		}
		nmProduct = nmProduct.toUpperCase();
		product = getProductByName(nmProduct);
		if(product == null){
			product = new Product();
			product.setNmProduct(nmProduct);
			
			ConexaoDao.getInstance().save(product);
		}
		result.use(json()).from(product, "product").serialize();
	}
	
	private Product getProductByName(String nmProduct){
		return ds.createQuery(Product.class).field("nmProduct").equal(nmProduct).get();
	}
	
}