Package io.joshworks.snappy.loader

Class Launcher

java.lang.Object

io.joshworks.snappy.loader.Launcher

Direct Known Subclasses:

ExecutableArchiveLauncher, PropertiesLauncher

public abstract class Launcher
extends Object

Base class for launchers that can start an application with a fully configured classpath backed by one or more Archives.

Author:

Phillip Webb, Dave Syer

Field Summary

Fields

Modifier and Type	Field	Description
protected Logger	logger

Constructor Summary

Constructors

Constructor	Description
Launcher()

Method Summary

Modifier and Type	Method	Description
protected Archive	createArchive()
protected ClassLoader	createClassLoader(URL[] urls)	Create a classloader for the specified URLs.
protected ClassLoader	createClassLoader(List<Archive> archives)	Create a classloader for the specified archives.
protected Runnable	createMainMethodRunner(String mainClass, String[] args, ClassLoader classLoader)	Create the MainMethodRunner used to launch the application.
protected abstract List<Archive>	getClassPathArchives()	Returns the archives that will be used to construct the class path.
protected abstract String	getMainClass()	Returns the main class that should be launched.
protected void	launch(String[] args)	Launch the application.
protected void	launch(String[] args, String mainClass, ClassLoader classLoader)	Launch the application given the archive file and a fully configured classloader.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected Logger logger

Constructor Detail

Launcher

public Launcher()

Method Detail

launch

protected void launch(String[] args)

Launch the application. This method is the initial entry point that should be called by a subclass public static void main(String[] args) method.

Parameters:

args - the incoming arguments

createClassLoader

protected ClassLoader createClassLoader(List<Archive> archives)
                                 throws Exception

Create a classloader for the specified archives.

Parameters:

archives - the archives

Returns:

the classloader

Throws:

Exception - if the classloader cannot be created

createClassLoader

protected ClassLoader createClassLoader(URL[] urls)
                                 throws Exception

Create a classloader for the specified URLs.

Parameters:

urls - the URLs

Returns:

the classloader

Throws:

Exception - if the classloader cannot be created

launch

protected void launch(String[] args,
                      String mainClass,
                      ClassLoader classLoader)
               throws Exception

Launch the application given the archive file and a fully configured classloader.

Parameters:

args - the incoming arguments

mainClass - the main class to run

classLoader - the classloader

Throws:

Exception - if the launch fails

createMainMethodRunner

protected Runnable createMainMethodRunner(String mainClass,
                                          String[] args,
                                          ClassLoader classLoader)
                                   throws Exception

Create the MainMethodRunner used to launch the application.

Parameters:

mainClass - the main class

args - the incoming arguments

classLoader - the classloader

Returns:

a runnable used to start the application

Throws:

Exception - if the main method runner cannot be created

getMainClass

protected abstract String getMainClass()
                                throws Exception

Returns the main class that should be launched.

Returns:

the name of the main class

Throws:

Exception - if the main class cannot be obtained

getClassPathArchives

protected abstract List<Archive> getClassPathArchives()
                                               throws Exception

Returns the archives that will be used to construct the class path.

Returns:

the class path archives

Throws:

Exception - if the class path archives cannot be obtained

createArchive

protected final Archive createArchive()
                               throws Exception

Throws:

Exception