org.apache.flink.table.runtime.generated

Class CompileUtils

java.lang.Object

org.apache.flink.table.runtime.generated.CompileUtils

public final class CompileUtils
extends Object

Utilities to compile a generated code to a Class.

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.flink.shaded.guava18.com.google.common.cache.Cache<String,org.apache.flink.shaded.guava18.com.google.common.cache.Cache<ClassLoader,Class>>	COMPILED_CACHE Cache of compile, Janino generates a new Class Loader and a new Class file every compile (guaranteeing that the class name will not be repeated).

Constructor Summary

Constructors

Constructor and Description
CompileUtils()

Method Summary

Modifier and Type	Method and Description
static <T> Class<T>	compile(ClassLoader cl, String name, String code) Compiles a generated code to a Class.

Methods inherited from class java.lang.Object

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

Field Detail

COMPILED_CACHE

protected static final org.apache.flink.shaded.guava18.com.google.common.cache.Cache<String,org.apache.flink.shaded.guava18.com.google.common.cache.Cache<ClassLoader,Class>> COMPILED_CACHE

Cache of compile, Janino generates a new Class Loader and a new Class file every compile (guaranteeing that the class name will not be repeated). This leads to multiple tasks of the same process that generate a large number of duplicate class, resulting in a large number of Meta zone GC (class unloading), resulting in performance bottlenecks. So we add a cache to avoid this problem.

Constructor Detail

CompileUtils

public CompileUtils()

Method Detail

compile

public static <T> Class<T> compile(ClassLoader cl,
                                   String name,
                                   String code)

Compiles a generated code to a Class.

Type Parameters:

T - the class type

Parameters:

cl - the ClassLoader used to load the class

name - the class name

code - the generated code

Returns:

the compiled class