org.vaadin.spring.internal.VaadinSessionScope.java Source code

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Here is the source code for org.vaadin.spring.internal.VaadinSessionScope.java

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/*
 * Copyright 2014 The original authors
 *
 * 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 org.vaadin.spring.internal;

import com.vaadin.server.SessionDestroyEvent;
import com.vaadin.server.SessionDestroyListener;
import com.vaadin.server.VaadinSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.config.Scope;

/**
 * Implementation of Spring's {@link org.springframework.beans.factory.config.Scope} that binds the beans to the
 * current {@link com.vaadin.server.VaadinSession} (as opposed to the current Servlet session). Registered by default
 * as the scope "{@value #VAADIN_SESSION_SCOPE_NAME}".
 *
 * @author Petter Holmstrm (petter@vaadin.com)
 * @see org.vaadin.spring.VaadinSessionScope
 */
public class VaadinSessionScope implements Scope, BeanFactoryPostProcessor {

    public static final String VAADIN_SESSION_SCOPE_NAME = "vaadin-session";
    private static final Logger LOGGER = LoggerFactory.getLogger(VaadinSessionScope.class);

    private static BeanStoreRetrievalStrategy beanStoreRetrievalStrategy = new VaadinSessionBeanStoreRetrievalStrategy();

    /**
     * Sets the {@link BeanStoreRetrievalStrategy} to use.
     */
    public static synchronized void setBeanStoreRetrievalStrategy(
            BeanStoreRetrievalStrategy beanStoreRetrievalStrategy) {
        if (beanStoreRetrievalStrategy == null) {
            beanStoreRetrievalStrategy = new VaadinSessionBeanStoreRetrievalStrategy();
        }
        VaadinSessionScope.beanStoreRetrievalStrategy = beanStoreRetrievalStrategy;
    }

    /**
     * Returns the {@link BeanStoreRetrievalStrategy} to use.
     * By default, {@link org.vaadin.spring.internal.VaadinSessionScope.VaadinSessionBeanStoreRetrievalStrategy} is used.
     */
    public static synchronized BeanStoreRetrievalStrategy getBeanStoreRetrievalStrategy() {
        return beanStoreRetrievalStrategy;
    }

    @Override
    public Object get(String s, ObjectFactory<?> objectFactory) {
        return getBeanStore().get(s, objectFactory);
    }

    @Override
    public Object remove(String s) {
        return getBeanStore().remove(s);
    }

    @Override
    public void registerDestructionCallback(String s, Runnable runnable) {
        getBeanStore().registerDestructionCallback(s, runnable);
    }

    @Override
    public Object resolveContextualObject(String s) {
        return null;
    }

    @Override
    public String getConversationId() {
        return getBeanStoreRetrievalStrategy().getConversationId();
    }

    private BeanStore getBeanStore() {
        return getBeanStoreRetrievalStrategy().getBeanStore();
    }

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory)
            throws BeansException {
        LOGGER.debug("Registering VaadinSession scope with bean factory [{}]", configurableListableBeanFactory);
        configurableListableBeanFactory.registerScope(VAADIN_SESSION_SCOPE_NAME, this);
    }

    /**
     * Implementation of {@link BeanStoreRetrievalStrategy} that
     * stores the {@link BeanStore} in the current {@link com.vaadin.server.VaadinSession}.
     */
    public static class VaadinSessionBeanStoreRetrievalStrategy implements BeanStoreRetrievalStrategy {

        private VaadinSession getVaadinSession() {
            VaadinSession current = VaadinSession.getCurrent();
            if (current == null) {
                throw new IllegalStateException("No VaadinSession bound to current thread");
            }
            if (current.getState() != VaadinSession.State.OPEN) {
                throw new IllegalStateException("Current VaadinSession is not open");
            }
            return current;
        }

        @Override
        public BeanStore getBeanStore() {
            VaadinSession session = getVaadinSession();
            session.lock();
            try {
                BeanStore beanStore = session.getAttribute(BeanStore.class);
                if (beanStore == null) {
                    beanStore = new BeanStore("session " + session.getSession().getId());
                    session.setAttribute(BeanStore.class, beanStore);
                    final BeanStore theBeanStore = beanStore;
                    session.getService().addSessionDestroyListener(new SessionDestroyListener() {
                        @Override
                        public void sessionDestroy(SessionDestroyEvent event) {
                            theBeanStore.destroy();
                            event.getService().removeSessionDestroyListener(this);
                        }
                    });
                }
                return beanStore;
            } finally {
                session.unlock();
            }
        }

        @Override
        public String getConversationId() {
            return getVaadinSession().getSession().getId();
        }
    }
}