Package org.apache.hadoop.hbase.util

Class ReflectionUtils

java.lang.Object

org.apache.hadoop.hbase.util.ReflectionUtils

@Private
public class ReflectionUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
private static long	previousLogTime
private static final ThreadMXBean	threadBean

Constructor Summary

Constructors

Constructor	Description
ReflectionUtils()

Method Summary

Modifier and Type	Method	Description
static <T> Constructor<T>	findConstructor(Class<T> type, Object... paramTypes)
static ClassLoader	getClassLoader()
static Field	getModifiersField()
static <I, R> Function<I,R>	getOneArgStaticMethodAsFunction(Class<?> lookupClazz, String methodName, Class<I> argumentClazz, Class<R> returnValueClass)	Creates a Function which can be called to performantly execute a reflected static method.
private static Class<?>[]	getParameterTypes(Object[] params)
private static String	getTaskName(long id, String name)
static <T> T	instantiate(String className, Constructor<T> ctor, Object... ctorArgs)
static <T> T	instantiateWithCustomCtor(String className, Class<?>[] ctorArgTypes, Object[] ctorArgs)
static Object	invokeMethod(Object obj, String methodName, Object... params)	Get and invoke the target method from the given object with given parameters
static void	logThreadInfo(org.slf4j.Logger log, String title, long minInterval)	Log the current thread stacks at INFO level.
static <T> T	newInstance(Class<T> type, Object... params)
static <T> T	newInstance(String className, Object... params)
(package private) static void	printThreadInfo(PrintStream stream, String title)	Print all of the thread's information and stack traces.

Methods inherited from class java.lang.Object

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

Field Details

previousLogTime

private static long previousLogTime

threadBean

private static final ThreadMXBean threadBean

Constructor Details

ReflectionUtils

public ReflectionUtils()

Method Details

instantiateWithCustomCtor

public static <T> T instantiateWithCustomCtor(String className,
 Class<?>[] ctorArgTypes,
 Object[] ctorArgs)

instantiate

public static <T> T instantiate(String className,
 Constructor<T> ctor,
 Object... ctorArgs)

newInstance

public static <T> T newInstance(String className,
 Object... params)

getClassLoader

public static ClassLoader getClassLoader()

newInstance

public static <T> T newInstance(Class<T> type,
 Object... params)

findConstructor

public static <T> Constructor<T> findConstructor(Class<T> type,
 Object... paramTypes)

logThreadInfo

public static void logThreadInfo(org.slf4j.Logger log,
 String title,
 long minInterval)

Log the current thread stacks at INFO level.

Parameters:

log - the logger that logs the stack trace

title - a descriptive title for the call stacks

minInterval - the minimum time from the last

printThreadInfo

static void printThreadInfo(PrintStream stream,
 String title)

Print all of the thread's information and stack traces.

Parameters:

stream - the stream to

title - a string title for the stack trace

getTaskName

private static String getTaskName(long id,
 String name)

getOneArgStaticMethodAsFunction

public static <I,
R> Function<I,R> getOneArgStaticMethodAsFunction(Class<?> lookupClazz,
 String methodName,
 Class<I> argumentClazz,
 Class<R> returnValueClass)
                                                           throws Throwable

Creates a Function which can be called to performantly execute a reflected static method. The creation of the Function itself may not be fast, but executing that method thereafter should be much faster than invokeMethod(Object, String, Object...).

Parameters:

lookupClazz - the class to find the static method in

methodName - the method name

argumentClazz - the type of the argument

returnValueClass - the type of the return value

Returns:

a function which when called executes the requested static method.

Throws:

Throwable - exception types from the underlying reflection

invokeMethod

@NonNull
public static Object invokeMethod(Object obj,
 String methodName,
 Object... params)

Get and invoke the target method from the given object with given parameters

Parameters:

obj - the object to get and invoke method from

methodName - the name of the method to invoke

params - the parameters for the method to invoke

Returns:

the return value of the method invocation

getParameterTypes

private static Class<?>[] getParameterTypes(Object[] params)

getModifiersField

public static Field getModifiersField()
                               throws IllegalAccessException,
NoSuchFieldException

Throws:

IllegalAccessException

NoSuchFieldException