com.nokia.dempsy.spring.RunAppInVm.java Source code

Introduction

Here is the source code for com.nokia.dempsy.spring.RunAppInVm.java

Source

/*
 * Copyright 2012 the original author or 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 com.nokia.dempsy.spring;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MarkerFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.nokia.dempsy.Dempsy;
import com.nokia.dempsy.DempsyException;

public class RunAppInVm {
    protected static Logger logger = LoggerFactory.getLogger(RunAppInVm.class);
    protected static final String appdefParam = "appdef";
    protected static final String applicationParam = "application";

    public static void main(String[] args) {
        try {
            run(args);
        } catch (Throwable e) {
            e.printStackTrace(System.err);
            System.err.flush();
            System.exit(1);
        }
        System.exit(0);
    }

    public static void run(String[] args) throws Throwable {
        //======================================================
        // Handle all of the options.
        String appCtxFilename = System.getProperty(appdefParam);
        if (appCtxFilename == null || appCtxFilename.length() == 0) {
            //         usage("the java vm option \"-D" + appdefParam + "\" wasn't specified.");
            String application = System.getProperty(applicationParam);
            if (application == null || application.length() == 0)
                usage("the java vm option \"-D" + appdefParam + "\" or the java vm option \"-D" + applicationParam
                        + "\" wasn't specified.");
            appCtxFilename = "DempsyApplicationContext-" + application + ".xml";
        }
        //======================================================

        String contextFile = "classpath:Dempsy-localVm.xml";
        ClassPathXmlApplicationContext context = null;
        try {
            // Initialize Spring
            context = new ClassPathXmlApplicationContext(new String[] { appCtxFilename, contextFile });
            context.registerShutdownHook();
        } catch (Throwable e) {
            logger.error(MarkerFactory.getMarker("FATAL"), "Failed to start the application ", e);
            throw e;
        }
        if (context != null) {
            try {
                context.getBean(Dempsy.class).waitToBeStopped();
            } catch (InterruptedException e) {
                logger.error("Interrupted . . . ", e);
            } finally {
                context.stop();
            }

            logger.info("Shut down dempsy appliction " + appCtxFilename + ", bye!");
        }
    }

    public static void usage(String errorMessage) throws DempsyException {
        StringBuilder sb = new StringBuilder();
        if (errorMessage != null)
            sb.append("ERROR:" + errorMessage + "\n");
        sb.append("usage example: java [-D" + appdefParam + "=MyAppDefinition.xml|-D" + applicationParam
                + "=testApp ] -cp (classpath) " + RunAppInVm.class.getName() + "\n");
        sb.append("    -D" + appdefParam
                + " must be supplied to indicate the Dempsy application definition's spring application context xml file.\n");
        sb.append(
                "           A file with the name given that contains a spring application context xml must be on the classpath.\n");
        sb.append("           OR ");
        sb.append("    -D" + applicationParam
                + " must be supplied to indicate the Dempsy application name defined in spring application context xml file.\n");
        sb.append(
                "           A file with the name DempsyApplicationContext-${applicaitonName}.xml that contains a spring applicaiton context xml must be on the classpath.");

        logger.error(MarkerFactory.getMarker("FATAL"), sb.toString());
        throw new DempsyException(sb.toString());
    }

}