Package dev.frostlake.executor.udf

Class ChildFirstUdfClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

dev.frostlake.executor.udf.ChildFirstUdfClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

public final class ChildFirstUdfClassLoader
extends URLClassLoader

Classloader for IMPORTS handler jars that prefers the jar (and its stage-sibling dependency jars) over the engine's classpath — the equivalent of Snowflake running a UDF against the dependency set its PACKAGES clause supplies, not against whatever the warehouse happens to have loaded. Without this, a handler built against one library version silently ran against the engine's copy: the vendor plugin-output parsers (generated with ANTLR 4.11) picked up the engine's ANTLR 4.13 runtime, warning on every call and mis-recovering on inputs their own runtime parses cleanly.

Classes the handler must SHARE with the engine stay parent-first: JDK classes, the engine's own dev.frostlake types, the com.snowflake Snowpark bridge (a procedure's Session argument must be the engine's class, not a copy from the jar), and SLF4J so logging binds once.

Constructor Summary

Constructors

Constructor	Description
ChildFirstUdfClassLoader(URL[] urls, ClassLoader parent)

Method Summary

Modifier and Type	Method	Description
protected Class<?>	loadClass(String name, boolean resolve)

Methods inherited from class java.net.URLClassLoader

addURL, close, definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, getURLs, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Constructor Details

ChildFirstUdfClassLoader

public ChildFirstUdfClassLoader(URL[] urls,
 ClassLoader parent)

Method Details

loadClass

protected Class<?> loadClass(String name,
 boolean resolve)
                      throws ClassNotFoundException

Overrides:

loadClass in class ClassLoader

Throws:

ClassNotFoundException