be.iminds.iot.dianne.builder.DianneBuilder.java Source code

Introduction

Here is the source code for be.iminds.iot.dianne.builder.DianneBuilder.java

Source

/*******************************************************************************
 * DIANNE  - Framework for distributed artificial neural networks
 * Copyright (C) 2015  iMinds - IBCN - UGent
 *
 * This file is part of DIANNE.
 *
 * DIANNE is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Contributors:
 *     Tim Verbelen, Steven Bohez
 *******************************************************************************/
package be.iminds.iot.dianne.builder;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.component.annotations.ReferenceCardinality;
import org.osgi.service.component.annotations.ReferencePolicy;
import org.osgi.service.http.HttpService;

import be.iminds.iot.dianne.api.nn.module.dto.ModulePropertyDTO;
import be.iminds.iot.dianne.api.nn.module.dto.ModuleTypeDTO;
import be.iminds.iot.dianne.api.nn.module.factory.ModuleFactory;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.google.gson.JsonPrimitive;

@Component(service = { javax.servlet.Servlet.class }, property = { "alias:String=/dianne/builder",
        "osgi.http.whiteboard.servlet.pattern=/dianne/builder", "aiolos.proxy=false" }, immediate = true)
public class DianneBuilder extends HttpServlet {

    private static final long serialVersionUID = 1L;

    private List<ModuleFactory> factories = Collections.synchronizedList(new ArrayList<ModuleFactory>());

    @Reference(cardinality = ReferenceCardinality.AT_LEAST_ONE, policy = ReferencePolicy.DYNAMIC)
    void addModuleFactory(ModuleFactory factory) {
        factories.add(factory);
    }

    void removeModuleFactory(ModuleFactory factory) {
        factories.remove(factory);
    }

    @Reference
    void setHttpService(HttpService http) {
        try {
            // TODO How to register resources with whiteboard pattern?
            http.registerResources("/dianne/ui/builder", "res", null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.sendRedirect("/dianne/ui/builder/builder.html");
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("application/json");
        String action = request.getParameter("action");

        if (action.equals("available-modules")) {
            getAvailableModules(response.getWriter());
        } else if (action.equals("module-properties")) {
            String type = request.getParameter("type");
            getModuleProperties(type, response.getWriter());
        }
    }

    private void getAvailableModules(PrintWriter writer) {
        List<ModuleTypeDTO> moduleTypes = new ArrayList<ModuleTypeDTO>();
        synchronized (factories) {
            for (ModuleFactory f : factories) {
                moduleTypes.addAll(f.getAvailableModuleTypes());
            }
        }

        JsonArray jsonModules = new JsonArray();
        for (ModuleTypeDTO moduleType : moduleTypes) {
            JsonObject jsonModule = new JsonObject();
            jsonModule.add("type", new JsonPrimitive(moduleType.type));
            jsonModule.add("category", new JsonPrimitive(moduleType.category));
            if (moduleType.trainable) {
                jsonModule.add("trainable", new JsonPrimitive(true));
            }
            jsonModules.add(jsonModule);
        }
        writer.write(jsonModules.toString());
        writer.flush();
    }

    private void getModuleProperties(String type, PrintWriter writer) {
        ModuleTypeDTO module = null;
        synchronized (factories) {
            for (ModuleFactory f : factories) {
                module = f.getModuleType(type);
                if (module != null)
                    break;
            }
        }

        if (module == null) {
            // return;
        }

        JsonArray jsonProperties = new JsonArray();
        for (ModulePropertyDTO p : module.properties) {
            JsonObject jsonProperty = new JsonObject();
            jsonProperty.addProperty("id", p.id);
            jsonProperty.addProperty("name", p.name);

            jsonProperties.add(jsonProperty);
        }

        writer.write(jsonProperties.toString());
        writer.flush();
    }
}