org.abstracthorizon.extend.server
Class Bootstrap

java.lang.Object
  org.abstracthorizon.extend.server.Bootstrap

public class Bootstrap
extends Object

Bootstrap class. This class first tries to find home directory of the server:

• URL of this class is found
• then root of class path is taken where this class is in
• if url is jar then directory jar is in is taken
• directory's name is checked if it is "bin", if so - parent is taken

Then class loader with class path is created with all jar files from lib subdirectory (of the home directory), and lib directory itself is added to the class path.

After that server directory is determined from arguments (TODO) or if none present from &quit;server/default" directory of the home directory.

Last part is to load Server class (using reflection), pass home and server's urls to it (in constructor) and then to invoke it calling create() and start() methods.

Author:

Daniel Sendula

Constructor Summary

Bootstrap()

Method Summary

static Collection<URL>	collectFiles(URL url) Collects files from given url.
static Collection<URL>	collectFilesFromJar(URL original, JarFile jarFile) Collects files from jar file (root of)
static Collection<URL>	collectFilesFromPath(File path) Collects files from given path
static Collection<URL>	collectFilesFromURL(URL url) Collects files from give (generic) url
static URLClassLoader	createClassLoader(ClassLoader parent, URL lib) Creates class loader for given url.
static URL	getHomeLocation() Gets home location.
static void	invokeMethod(Object object, String methodName, boolean mustBePresent) Invokes parametherless method with given name.
static void	main(String[] args) Main method

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Bootstrap

public Bootstrap()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Main method

Parameters:

args - arguments

Throws:

Exception

getHomeLocation

public static URL getHomeLocation()
                           throws MalformedURLException

Gets home location.

Returns:

home location

Throws:

MalformedURLException

createClassLoader

public static URLClassLoader createClassLoader(ClassLoader parent,
                                               URL lib)
                                        throws IOException

Creates class loader for given url. If url is directory then it is scanned and all jar files from it added to classpath.

Parameters:

parent - parent class loader or null

lib - url class loader to be created for.

Returns:

URLClassLoader instance

Throws:

IOException

collectFiles

public static Collection<URL> collectFiles(URL url)
                                    throws IOException

Collects files from given url.

Parameters:

url - url

Returns:

collection of urls

Throws:

IOException

collectFilesFromPath

public static Collection<URL> collectFilesFromPath(File path)
                                            throws IOException

Collects files from given path

Parameters:

path - directory

Returns:

collection of urls

Throws:

IOException

collectFilesFromJar

public static Collection<URL> collectFilesFromJar(URL original,
                                                  JarFile jarFile)
                                           throws IOException

Collects files from jar file (root of)

Parameters:

original - original url

jarFile - jar file

Returns:

collection of urls

Throws:

IOException

collectFilesFromURL

public static Collection<URL> collectFilesFromURL(URL url)
                                           throws IOException

Collects files from give (generic) url

Parameters:

url - url

Returns:

collection of files

Throws:

IOException

invokeMethod

public static void invokeMethod(Object object,
                                String methodName,
                                boolean mustBePresent)

Invokes parametherless method with given name. If mustBePresent is set to true NoSuchMethodException is propagated wrapped in RuntimeException.

Parameters:

object - instance on which method is going to be executed

methodName - method name

mustBePresent - if set then method must be present or NoSuchMethodError is thrown

Throws:

RuntimeException - if NoSuchMethodException, IllegalArgumentException, IllegalAccessException or InvocationTargetException is thrown.