darks.grid.web.GridContextListener.java Source code

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Here is the source code for darks.grid.web.GridContextListener.java

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/**
 * 
 * Copyright 2015 The Darks Grid Project (Liu lihua)
 *
 * 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 darks.grid.web;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import darks.grid.GridRuntime;
import darks.grid.config.GridConfigFactory;
import darks.grid.config.GridConfiguration;
import darks.grid.spring.GridSpringContext;

public class GridContextListener implements ServletContextListener {

    private static final String DEFAULT_CONFIG_PATH = "/grid-config.xml";

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        GridRuntime.destroy();
    }

    @Override
    public void contextInitialized(ServletContextEvent ctx) {
        if (isSpringValid())
            GridSpringContext.loadContext(ctx.getServletContext());
        String configPath = ctx.getServletContext().getInitParameter("configPath");
        if (configPath == null || "".equals(configPath.trim()))
            configPath = DEFAULT_CONFIG_PATH;
        else
            configPath = configPath.trim();
        GridConfiguration config = GridConfigFactory.configure(this.getClass().getResourceAsStream(configPath));
        GridRuntime.initialize(config);
    }

    private boolean isSpringValid() {
        try {
            Class<?> clazz1 = Class.forName("org.springframework.context.ApplicationContext");
            Class<?> clazz2 = Class.forName("org.springframework.web.context.support.WebApplicationContextUtils");
            return clazz1 != null && clazz2 != null;
        } catch (ClassNotFoundException e) {
            return false;
        }
    }
}