org.ualerts.fixed.service.SpringPrototypeBeanCommandService.java Source code

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Here is the source code for org.ualerts.fixed.service.SpringPrototypeBeanCommandService.java

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/*
 * File created on May 1, 2013 
 *
 * Copyright 2008-2013 Virginia Polytechnic Institute and State University
 *
 * 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.ualerts.fixed.service;

import javax.annotation.Resource;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * An implementation of {@link CommandService} that utilizes the Spring
 * Framework's prototype bean concept.  Commands using this service must
 * be annotated with {@link CommandComponent}.
 *
 * @author Carl Harris
 */
@Service("commandService")
public class SpringPrototypeBeanCommandService implements CommandService, ApplicationContextAware {

    private ApplicationContext applicationContext;
    private CommandInvoker commandInvoker;

    /**
     * Gets the {@code applicationContext} property.
     * @return property value
     */
    public ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * ${@inheritDoc}
     */
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    /**
     * Sets the {@code commandInvoker} property.
     * @param commandInvoker the property value to set
     */
    @Resource
    public void setCommandInvoker(CommandInvoker commandInvoker) {
        this.commandInvoker = commandInvoker;
    }

    /**
     * {@inheritDoc}
     * <strong>NOTE</strong>: The command must be annotated with 
     * {@link CommandComponent}
     */
    @SuppressWarnings("rawtypes")
    public <T extends Command> T newCommand(Class<T> commandClass) throws Exception {
        return getApplicationContext().getBean(commandClass);
    }

    /**
     * {@inheritDoc}
     * <strong>NOTE</strong>: The command must be annotated with 
     * {@link CommandComponent}
     */
    @SuppressWarnings({ "rawtypes" })
    public <T extends Command> T newCommand(String beanName, Class<T> commandClass) throws Exception {
        return getApplicationContext().getBean(beanName, commandClass);
    }

    /**
     * {@inheritDoc}
     */
    @Transactional(rollbackFor = { java.lang.Exception.class })
    public <T> T invoke(Command<T> command) throws Exception {
        return commandInvoker.invoke(command);
    }

}