org.apache.pulsar.functions.instance

Class JavaInstanceMain

java.lang.Object

org.apache.pulsar.functions.instance.JavaInstanceMain

public class JavaInstanceMain
extends Object

This is the initial class that gets called when starting a Java Function instance. Multiple class loaders are used to separate function instance dependencies from user code dependencies This class will create three classloaders: 1. The root classloader that will share interfaces between the function instance classloader and user code classloader. This classloader will contain the following dependencies - pulsar-functions-api - pulsar-client-api - log4j-slf4j-impl - slf4j-api - log4j-core - log4j-api 2. The Function instance classloader, a child of the root classloader, that loads all pulsar broker/worker dependencies 3. The user code classloader, a child of the root classloader, that loads all user code dependencies This class should not use any other dependencies!

Constructor Summary

Constructors

Constructor and Description
JavaInstanceMain()

Method Summary

Modifier and Type	Method and Description
static Object	createInstance(String userClassName, ClassLoader classLoader)
static boolean	isBlank(String str)
static ClassLoader	loadJar(ClassLoader parent, File[] jars)
static void	main(String[] args)

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaInstanceMain

public JavaInstanceMain()

Method Detail

main

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

Throws:

Exception

createInstance

public static Object createInstance(String userClassName,
                                    ClassLoader classLoader)

loadJar

public static ClassLoader loadJar(ClassLoader parent,
                                  File[] jars)
                           throws MalformedURLException

Throws:

MalformedURLException

isBlank

public static boolean isBlank(String str)