Package org.apache.cassandra.utils

Class ReflectionUtils

java.lang.Object

org.apache.cassandra.utils.ReflectionUtils

public class ReflectionUtils
extends Object

Method Summary

Modifier and Type	Method	Description
static <K, V> void	clearMapField(Class<?> clazz, Object instance, String mapName, Predicate<Map.Entry<K,V>> shouldRemove)	Used by the in-jvm dtest framework to remove entries from private map fields that otherwise would prevent collection of classloaders (which causes metaspace OOMs) or otherwise interfere with instance restart.
static Field	getField(Class<?> clazz, String fieldName)
static Field	getModifiersField()

Methods inherited from class java.lang.Object

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

Method Details

getModifiersField

public static Field getModifiersField()
                               throws NoSuchFieldException

Throws:

NoSuchFieldException

getField

public static Field getField(Class<?> clazz,
 String fieldName)
                      throws NoSuchFieldException

Throws:

NoSuchFieldException

clearMapField

public static <K,
V> void clearMapField(Class<?> clazz,
 Object instance,
 String mapName,
 Predicate<Map.Entry<K,V>> shouldRemove)

Used by the in-jvm dtest framework to remove entries from private map fields that otherwise would prevent collection of classloaders (which causes metaspace OOMs) or otherwise interfere with instance restart.

Type Parameters:

K - The type of the map key

V - The type of the map value

Parameters:

clazz - The class which has the map field to clear

instance - an instance of the class to clear (pass null for a static member)

mapName - the name of the map field to clear

shouldRemove - a predicate which determines if the entry in question should be removed