com.cloudera.cli.validator.Main.java Source code

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Here is the source code for com.cloudera.cli.validator.Main.java

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// Licensed to Cloudera, Inc. under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  Cloudera, Inc. licenses this file
// to you 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.cloudera.cli.validator;

import com.cloudera.cli.validator.components.CommandLineOptions;
import com.cloudera.cli.validator.components.Constants;
import com.cloudera.validation.ValidationRunner;

import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.commons.cli.ParseException;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.BeanInstantiationException;
import org.springframework.beans.factory.BeanCreationException;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * The Validator Main
 */
public class Main {

    private static final Logger LOG = LoggerFactory.getLogger(Main.class);

    private final OutputStream outStream;
    private final OutputStream errStream;
    private final String appName;

    /**
     * Create an application.
     */
    public Main(String appName, OutputStream outStream, OutputStream errStream) {
        this.outStream = outStream;
        this.errStream = errStream;
        this.appName = appName;
    }

    /**
     * From the arguments, run the validation.
     *
     * @param args command line arguments
     * @throws IOException anything goes wrong with streams.
     * @return exit code
     */
    public int run(String[] args) throws IOException {
        Writer writer = new OutputStreamWriter(outStream, Constants.CHARSET_UTF_8);
        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
        try {
            BeanDefinition cmdOptsbeanDefinition = BeanDefinitionBuilder
                    .rootBeanDefinition(CommandLineOptions.class).addConstructorArgValue(appName)
                    .addConstructorArgValue(args).getBeanDefinition();
            ctx.registerBeanDefinition(CommandLineOptions.BEAN_NAME, cmdOptsbeanDefinition);
            ctx.register(ApplicationConfiguration.class);
            ctx.refresh();
            CommandLineOptions cmdOptions = ctx.getBean(CommandLineOptions.BEAN_NAME, CommandLineOptions.class);
            CommandLineOptions.Mode mode = cmdOptions.getMode();
            if (mode == null) {
                throw new ParseException("No valid command line arguments");
            }
            ValidationRunner runner = ctx.getBean(mode.runnerName, ValidationRunner.class);
            boolean success = runner.run(cmdOptions.getCommandLineOptionActiveTarget(), writer);
            if (success) {
                writer.write("Validation succeeded.\n");
            }
            return success ? 0 : -1;
        } catch (BeanCreationException e) {
            String cause = e.getMessage();
            if (e.getCause() instanceof BeanInstantiationException) {
                BeanInstantiationException bie = (BeanInstantiationException) e.getCause();
                cause = bie.getMessage();
                if (bie.getCause() != null) {
                    cause = bie.getCause().getMessage();
                }
            }
            IOUtils.write(cause + "\n", errStream);
            CommandLineOptions.printUsageMessage(appName, errStream);
            return -2;
        } catch (ParseException e) {
            LOG.debug("Exception", e);
            IOUtils.write(e.getMessage() + "\n", errStream);
            CommandLineOptions.printUsageMessage(appName, errStream);
            return -2;
        } finally {
            if (ctx != null) {
                ctx.close();
            }
            writer.close();
        }
    }

    public static void main(String[] args) throws IOException {
        String appName = System.getProperty("app.name", "app");
        Main app = new Main(appName, System.out, System.err);
        int ret = app.run(args);
        System.exit(ret);
    }
}