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The Dolphin Platform is a framework that implements the presentation model pattern and provides amodern way to create enterprise applications. The Platform provides several client implementations that all canbe used in combination with a general sever API.
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/*
 * Copyright 2015-2017 Canoo Engineering AG.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.canoo.dolphin.server.controller;

import com.canoo.dolphin.event.Subscription;
import com.canoo.dolphin.impl.ReflectionHelper;
import com.canoo.dolphin.internal.BeanRepository;
import com.canoo.dolphin.server.DolphinAction;
import com.canoo.dolphin.server.DolphinModel;
import com.canoo.dolphin.server.Param;
import com.canoo.dolphin.server.container.ContainerManager;
import com.canoo.dolphin.server.container.ModelInjector;
import com.canoo.dolphin.server.impl.ServerBeanBuilder;
import com.canoo.dolphin.server.impl.ServerControllerActionCallBean;
import com.canoo.dolphin.server.mbean.DolphinContextMBeanRegistry;
import com.canoo.dolphin.server.mbean.beans.ModelProvider;
import com.canoo.dolphin.util.Assert;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

/**
 * This class wrapps the complete Dolphin Platform controller handling.
 * It defines the methods to create or destroy controllers and to interact with them.
 */
public class ControllerHandler {

    private static final Logger LOG = LoggerFactory.getLogger(ControllerHandler.class);

    private final Map controllers = new HashMap<>();

    private final Map controllerClassMapping = new HashMap<>();

    private final Map mBeanSubscriptions = new HashMap<>();

    private final Map models = new HashMap<>();

    private final ContainerManager containerManager;

    private final ServerBeanBuilder beanBuilder;

    private final ControllerRepository controllerRepository;

    private final DolphinContextMBeanRegistry mBeanRegistry;

    private final BeanRepository beanRepository;

    public ControllerHandler(DolphinContextMBeanRegistry mBeanRegistry, ContainerManager containerManager, ServerBeanBuilder beanBuilder, BeanRepository beanRepository, ControllerRepository controllerRepository) {
        this.mBeanRegistry = Assert.requireNonNull(mBeanRegistry, "mBeanRegistry");
        this.containerManager = Assert.requireNonNull(containerManager, "containerManager");
        this.beanBuilder = Assert.requireNonNull(beanBuilder, "beanBuilder");
        this.controllerRepository = Assert.requireNonNull(controllerRepository, "controllerRepository");
        this.beanRepository = Assert.requireNonNull(beanRepository, "beanRepository");
    }

    public Object getControllerModel(String id) {
        return models.get(id);
    }

    public String createController(final String name) {
        Assert.requireNonBlank(name, "name");
        Class controllerClass = controllerRepository.getControllerClassForName(name);

        if(controllerClass == null) {
            throw new ControllerCreationException("Can not find controller class for name " + name);
        }

        final String id = UUID.randomUUID().toString();
        Object instance = containerManager.createManagedController(controllerClass, new ModelInjector() {
            @Override
            public void inject(Object controller) {
                attachModel(id, controller);
            }
        });
        controllers.put(id, instance);
        controllerClassMapping.put(id, controllerClass);

        mBeanSubscriptions.put(id, mBeanRegistry.registerController(controllerClass, id, new ModelProvider() {
            @Override
            public Object getModel() {
                return models.get(id);
            }
        }));

        LOG.trace("Created Controller of type %s and id %s for name %s", controllerClass.getName(), id, name);

        return id;
    }

    public void destroyController(String id) {
        Object controller = controllers.remove(id);
        Class controllerClass = controllerClassMapping.remove(id);
        containerManager.destroyController(controller, controllerClass);

        Object model = models.remove(id);
        if (model != null) {
            beanRepository.delete(model);
        }

        Subscription subscription = mBeanSubscriptions.remove(id);
        if(subscription != null) {
            subscription.unsubscribe();
        }
    }

    public void destroyAllControllers() {
        List currentControllerIds = new ArrayList<>(getAllControllerIds());
        for(String id : currentControllerIds) {
            destroyController(id);
        }
    }

    private void attachModel(String controllerId, Object controller) {
        List allFields = ReflectionHelper.getInheritedDeclaredFields(controller.getClass());

        Field modelField = null;

        for (Field field : allFields) {
            if (field.isAnnotationPresent(DolphinModel.class)) {
                if (modelField != null) {
                    throw new RuntimeException("More than one Model was found for controller " + controller.getClass().getName());
                }
                modelField = field;
            }
        }

        if (modelField != null) {
            Object model = beanBuilder.createRootModel(modelField.getType());
            ReflectionHelper.setPrivileged(modelField, controller, model);
            models.put(controllerId, model);
        }
    }

    public void invokeAction(ServerControllerActionCallBean bean) throws InvokeActionException {
        Assert.requireNonNull(bean, "bean");
        Assert.requireNonBlank(bean.getControllerId(), "bean.getControllerId()");
        Assert.requireNonBlank(bean.getActionName(), "bean.getActionName()");
        try {
            final Object controller = controllers.get(bean.getControllerId());
            if(controller == null) {
                throw new InvokeActionException("No controller for id " + bean.getControllerId() + " found");
            }
            final Class controllerClass = controllerClassMapping.get(bean.getControllerId());
            if(controllerClass == null) {
                throw new InvokeActionException("No controllerClass for id " + bean.getControllerId() + " found");
            }
            final Method actionMethod = getActionMethod(controllerClass, bean.getActionName());
            if(actionMethod == null) {
                throw new InvokeActionException("No actionMethod with name " + bean.getActionName() + " in controller class " + controllerClass.getName() + " found");
            }
            final List