org.apache.flink.api.java

Class ClosureCleaner

java.lang.Object

org.apache.flink.api.java.ClosureCleaner

@Internal
public class ClosureCleaner
extends Object

The closure cleaner is a utility that tries to truncate the closure (enclosing instance) of non-static inner classes (created for inline transformation functions). That makes non-static inner classes in many cases serializable, where Java's default behavior renders them non-serializable without good reason.

Constructor Summary

Constructors

Constructor and Description
ClosureCleaner()

Method Summary

Modifier and Type	Method and Description
static void	clean(Object func, boolean checkSerializable) Tries to clean the closure of the given object, if the object is a non-static inner class.
static void	ensureSerializable(Object obj)

Methods inherited from class java.lang.Object

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

Constructor Detail

ClosureCleaner

public ClosureCleaner()

Method Detail

clean

public static void clean(Object func,
                         boolean checkSerializable)

Tries to clean the closure of the given object, if the object is a non-static inner class.

Parameters:

func - The object whose closure should be cleaned.

checkSerializable - Flag to indicate whether serializability should be checked after the closure cleaning attempt.

Throws:

org.apache.flink.api.common.InvalidProgramException - Thrown, if 'checkSerializable' is true, and the object was not serializable after the closure cleaning.

RuntimeException - A RuntimeException may be thrown, if the code of the class could not be loaded, in order to process during teh closure cleaning.

ensureSerializable

public static void ensureSerializable(Object obj)