gistfile1.java

package org.ivanursul.spark;

import static spark.Spark.delete;
import static spark.Spark.get;
import static spark.Spark.post;
import static spark.Spark.put;

import java.util.HashMap;
import java.util.Map;

import org.ivanursul.spark.dto.Person;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;


public class App {

	private static Long incrId = 1L;
	private static Map<Long, Person> personsMap = new HashMap<Long, Person>();
	private static Gson gson = new GsonBuilder().create();
	
    public static void main( final String[] args ) {
    	get("/persons", (request, response) -> {
    		Long id = Long.valueOf(request.queryParams("id"));
    		Person person = personsMap.get(id);
    		
    		return gson.toJson(person);
	});

	post("/persons", (request, response) -> {
		Long generatedId = getId();
		Person person = gson.fromJson(request.body(), Person.class);
		person.setId(generatedId);
		personsMap.put(generatedId, person);
		
		return gson.toJson(person);
	});

	put("/persons", (request, response) -> {
		Long id = Long.valueOf(request.queryParams("id"));
    	Person person = gson.fromJson(request.body(), Person.class);
		personsMap.put(id, person);
		
		return gson.toJson(person);   		
	});

	delete("/persons", (request, response) -> {
		Long id = Long.valueOf(request.queryParams("id"));
		personsMap.remove(id);
		
		return "Person removed";
	});    	
    }
    
    private static Long getId() {
    	synchronized (incrId) {
    		return incrId++;
		}
    }
}