ClientWrapperClassLoader (Flink : Table : SQL Client 1.19.3-cp3 API)

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method Description

void close()

void removeURL(URL url)
- Methods inherited from class org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader
  addURL, copy, 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, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, 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 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 AutoCloseable
    
    Specified by:
    
    close in interface Closeable
    
    Overrides:
    
    close in class org.apache.flink.util.FlinkUserCodeClassLoaders.SafetyNetWrapperClassLoader