hotbeans.support.SpringHotBeanContext.java Source code

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Here is the source code for hotbeans.support.SpringHotBeanContext.java

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/*
 * Copyright 2007 the project originators.
 * 
 * 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 hotbeans.support;

import hotbeans.HotBeanContext;

import java.beans.Introspector;

import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * HotBeanContext implementation that uses a Spring application context for definition of beans.
 * 
 * @author Tobias Lfstrand
 */
public class SpringHotBeanContext extends ClassPathXmlApplicationContext implements HotBeanContext {

    private ClassLoader classLoader;

    private volatile boolean initialized = false;

    /**
     * Creates a new SpringHotBeanContext.
     */
    public SpringHotBeanContext(ClassLoader classLoader) throws BeansException {
        super(new String[] { "hotBeanContext.xml" }, false);
        this.classLoader = classLoader;
    }

    /**
     * Overriden to set the class loader on the XmlBeanDefinitionReader.
     */
    protected void initBeanDefinitionReader(final XmlBeanDefinitionReader beanDefinitionReader) {
        super.initBeanDefinitionReader(beanDefinitionReader);

        // Set the bean class loader of beanDefinitionReader to the classloader used by the module
        beanDefinitionReader.setBeanClassLoader(this.classLoader);
    }

    /**
     * Gets the classloader used by this SpringHotBeanContext.
     */
    public ClassLoader getClassLoader() {
        return this.classLoader;
    }

    /**
     * Sets the classloader used by this SpringHotBeanContext.
     */
    public void setClassLoader(ClassLoader classLoader) {
        this.classLoader = classLoader;
    }

    /**
     * Initializes this context.
     */
    public void init() throws Exception {
        if (!this.initialized) {
            this.initialized = true;
            super.refresh();
        }
    }

    /**
     * Destroys this context.
     */
    public void destroy() {
        if (this.initialized) {
            super.destroy();

            LogFactory.release(this.classLoader);

            Introspector.flushCaches();

            this.initialized = false;
        }

        this.classLoader = null;
    }

    /**
     * Checks if this context contains the bean with the specified name.
     * 
     * @since 1.0.1 (20070302)
     */
    public boolean hasHotBean(final String beanName) {
        return super.containsBean(beanName);
    }

    /**
     * Gets the bean with the specified name.
     */
    public Object getHotBean(final String beanName) {
        return super.getBean(beanName);
    }

    /**
     * Gets the class name of the bean with the specified name from this context.
     * 
     * @since 1.0.1 (20070212)
     */
    public String getHotBeanClassName(final String beanName) {
        return ((AbstractBeanDefinition) super.getBeanFactory().getBeanDefinition(beanName)).getBeanClassName();
    }

    /**
     * Gets the class of the bean with the specified name from this context.
     * 
     * @since 1.0.1 (20070212)
     */
    public Class getHotBeanClass(final String beanName) {
        return super.getType(beanName);
    }
}