org.apache.cassandra.utils

Class ReflectionUtils

java.lang.Object

org.apache.cassandra.utils.ReflectionUtils

public class ReflectionUtils
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
ReflectionUtils()

Method Summary

Modifier and Type	Method and Description
static <K,V> void	clearMapField(java.lang.Class<?> clazz, java.lang.Object instance, java.lang.String mapName, java.util.function.Predicate<java.util.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 java.lang.reflect.Field	getField(java.lang.Class<?> clazz, java.lang.String fieldName)

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionUtils

public ReflectionUtils()

Method Detail

getField

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

Throws:

java.lang.NoSuchFieldException

clearMapField

public static <K,V> void clearMapField(java.lang.Class<?> clazz,
                                       java.lang.Object instance,
                                       java.lang.String mapName,
                                       java.util.function.Predicate<java.util.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