org.apache.flink.table.runtime.generated

类 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.

字段概要

字段

限定符和类型	字段和说明
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).

构造器概要

构造器

构造器和说明
CompileUtils()

方法概要

限定符和类型	方法和说明
static <T> Class<T>	compile(ClassLoader cl, String name, String code) Compiles a generated code to a Class.

从类继承的方法 java.lang.Object

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

字段详细资料

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.

构造器详细资料

CompileUtils

public CompileUtils()

方法详细资料

compile

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

Compiles a generated code to a Class.

类型参数:

T - the class type

参数:

cl - the ClassLoader used to load the class

name - the class name

code - the generated code

返回:

the compiled class