org.apache.flink.table.client.util

Class ClientWrapperClassLoader

java.lang.Object

java.lang.ClassLoader

java.security.SecureClassLoader

java.net.URLClassLoader

org.apache.flink.util.MutableURLClassLoader

org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader

org.apache.flink.table.client.util.ClientWrapperClassLoader

All Implemented Interfaces:

Closeable, AutoCloseable

@Experimental
 @Internal
public class ClientWrapperClassLoader
extends org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader

This class loader extends FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader, upon the addURL method, it also exposes a removeURL method which used to remove unnecessary jar from current classloader path. This class loader wraps a FlinkUserCodeClassLoader and an old classloader list, the class load is delegated to the inner FlinkUserCodeClassLoader.

This is only used to SqlClient for supporting REMOVE JAR clause currently. When remove a jar, get the registered jar url list from current FlinkUserCodeClassLoader firstly, then create a new instance of FlinkUserCodeClassLoader which urls doesn't include the removed jar, and the currentClassLoader point to new instance object, the old object is added to list to be closed when close ClientWrapperClassLoader.

Note: This classloader is not guaranteed to actually remove class or resource, any classes or resources in the removed jar that are already loaded, are still accessible.

Field Summary

Fields inherited from class org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader

inner

Constructor Summary

Constructors

Constructor and Description
ClientWrapperClassLoader(org.apache.flink.util.FlinkUserCodeClassLoader inner, org.apache.flink.configuration.Configuration configuration)

Method Summary

Modifier and Type	Method and Description
void	close()
void	removeURL(URL url)

Methods inherited from class org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader

addURL, getResource, getResources, getURLs, loadClass, loadClass

Methods inherited from class java.net.URLClassLoader

definePackage, findClass, findResource, findResources, getPermissions, getResourceAsStream, newInstance, newInstance

Methods inherited from class java.security.SecureClassLoader

defineClass, defineClass

Methods inherited from class java.lang.ClassLoader

clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners

Methods inherited from class java.lang.Object

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

Constructor Detail

ClientWrapperClassLoader

public ClientWrapperClassLoader(org.apache.flink.util.FlinkUserCodeClassLoader inner,
                                org.apache.flink.configuration.Configuration configuration)

Method Detail

removeURL

public void removeURL(URL url)

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader