com.techempower.gemini.lifecycle.InitDisplayEnvironment Maven / Gradle / Ivy

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 * Copyright (c) 2018, TechEmpower, Inc.
 * All rights reserved.
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package com.techempower.gemini.lifecycle;

import com.techempower.gemini.*;
import com.techempower.util.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Displays a start-up banner to the log.  Includes basic information about 
 * the Java virtual machine version, operating system, and the application 
 * itself.
 */
public class InitDisplayEnvironment
  implements InitializationTask
{
  private Logger log = LoggerFactory.getLogger(getClass());

  @Override
  public void taskInitialize(GeminiApplication app)
  {
    log.info("Environment details follow.");
    log.info(app.getVersion().getVerboseDescription());
    
    final String javaVm = System.getProperty("java.vm.name", "Unknown");
    final String javaVmVersion = System.getProperty("java.vm.version", "?");
    final String osName = System.getProperty("os.name", "Unknown");
    final String osVersion = System.getProperty("os.version", "?");
    final String osArch = System.getProperty("os.arch", "Unknown");
    
    log.info("{} (v{})", javaVm, javaVmVersion);
    log.info("{} (v{}; {})", osName, osVersion, osArch);

    if (app.getServletConfig() != null)
    {
      log.info("Servlet Container: {}",
          app.getServletConfig().getServerInfo());
    }
    
    log.info("JVM memory: {}Mb; free: {}Mb",
        Runtime.getRuntime().totalMemory() / UtilityConstants.MEGABYTE,
        Runtime.getRuntime().freeMemory() / UtilityConstants.MEGABYTE);
  }
  
}