com.facebook.presto.common.block

Class MethodHandleUtil

java.lang.Object

com.facebook.presto.common.block.MethodHandleUtil

public final class MethodHandleUtil
extends Object

Method Summary

Modifier and Type	Method and Description
static MethodHandle	compose(MethodHandle f, MethodHandle g)
static MethodHandle	compose(MethodHandle f, MethodHandle g, MethodHandle h)
static MethodHandle	methodHandle(Class<?> clazz, String name, Class<?>... parameterTypes) Returns a MethodHandle corresponding to the specified method.
static MethodHandle	nativeValueGetter(Type type)
static MethodHandle	nativeValueWriter(Type type)

Methods inherited from class java.lang.Object

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

Method Detail

compose

public static MethodHandle compose(MethodHandle f,
                                   MethodHandle g)

Parameters:

f - (U, S1, S2, ..., Sm)R

g - (T1, T2, ..., Tn)U

Returns:

(T1, T2, ..., Tn, S1, S2, ..., Sm)R

compose

public static MethodHandle compose(MethodHandle f,
                                   MethodHandle g,
                                   MethodHandle h)

Parameters:

f - (U, V)R

g - (S1, S2, ..., Sm)U

h - (T1, T2, ..., Tn)V

Returns:

(S1, S2, ..., Sm, T1, T2, ..., Tn)R

methodHandle

public static MethodHandle methodHandle(Class<?> clazz,
                                        String name,
                                        Class<?>... parameterTypes)

Returns a MethodHandle corresponding to the specified method.

Warning: The way Oracle JVM implements producing MethodHandle for a method involves creating JNI global weak references. G1 processes such references serially. As a result, calling this method in a tight loop can create significant GC pressure and significantly increase application pause time.

nativeValueGetter

public static MethodHandle nativeValueGetter(Type type)

nativeValueWriter

public static MethodHandle nativeValueWriter(Type type)