org.apache.hadoop.util

类 ReflectionUtils

java.lang.Object

org.apache.hadoop.util.ReflectionUtils

public class ReflectionUtils
extends Object

General reflection utils

构造器概要

构造器

构造器和说明
ReflectionUtils()

方法概要

方法

限定符和类型	方法和说明
static void	cloneWritableInto(Writable dst, Writable src) 已过时。
static <T> T	copy(Configuration conf, T src, T dst) Make a copy of the writable object using serialization to a buffer
static <T> Class<T>	getClass(T o) Return the correctly-typed Class of the given object.
static void	logThreadInfo(org.apache.commons.logging.Log log, String title, long minInterval) Log the current thread stacks at INFO level.
static <T> T	newInstance(Class<T> theClass, Configuration conf) Create an object for the given class and initialize it from conf
static void	printThreadInfo(PrintWriter stream, String title) Print all of the thread's information and stack traces.
static void	setConf(Object theObject, Configuration conf) Check and set 'configuration' if necessary.
static void	setContentionTracing(boolean val)

从类继承的方法 java.lang.Object

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

构造器详细资料

ReflectionUtils

public ReflectionUtils()

方法详细资料

setConf

public static void setConf(Object theObject,
           Configuration conf)

Check and set 'configuration' if necessary.

参数:

theObject - object for which to set configuration

conf - Configuration

newInstance

public static <T> T newInstance(Class<T> theClass,
                Configuration conf)

Create an object for the given class and initialize it from conf

参数:

theClass - class of which an object is created

conf - Configuration

返回:

a new object

setContentionTracing

public static void setContentionTracing(boolean val)

printThreadInfo

public static void printThreadInfo(PrintWriter stream,
                   String title)

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

参数:

stream - the stream to

title - a string title for the stack trace

logThreadInfo

public static void logThreadInfo(org.apache.commons.logging.Log log,
                 String title,
                 long minInterval)

Log the current thread stacks at INFO level.

参数:

log - the logger that logs the stack trace

title - a descriptive title for the call stacks

minInterval - the minimum time from the last

getClass

public static <T> Class<T> getClass(T o)

Return the correctly-typed Class of the given object.

参数:

o - object whose correctly-typed Class is to be obtained

返回:

the correctly typed Class of the given object.

copy

public static <T> T copy(Configuration conf,
         T src,
         T dst)
              throws IOException

Make a copy of the writable object using serialization to a buffer

参数:

dst - the object to copy from

src - the object to copy into, which is destroyed

抛出:

IOException

cloneWritableInto

@Deprecated
public static void cloneWritableInto(Writable dst,
                                Writable src)
                              throws IOException

已过时。

抛出:

IOException