org.apache.hadoop.hive.metastore.utils

Class JavaUtils

java.lang.Object

org.apache.hadoop.hive.metastore.utils.JavaUtils

public class JavaUtils
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
JavaUtils()

Method Summary

Modifier and Type	Method and Description
static <T> Class<? extends T>	getClass(String className, Class<T> clazz)
static ClassLoader	getClassLoader() Standard way of getting classloader in Hive code (outside of Hadoop).
static String	hostname()
static String	lockIdToString(long extLockId) Utility method for ACID to normalize logging info.
static <T> T	newInstance(Class<T> theClass) Create an object of the given class using a no-args constructor
static <T> T	newInstance(Class<T> theClass, Class<?>[] parameterTypes, Object[] initargs) Create an object of the given class.
static String	txnIdToString(long txnId) Utility method for ACID to normalize logging info.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

JavaUtils

public JavaUtils()

Method Detail

getClassLoader

public static ClassLoader getClassLoader()

Standard way of getting classloader in Hive code (outside of Hadoop). Uses the context loader to get access to classpaths to auxiliary and jars added with 'add jar' command. Falls back to current classloader. In Hadoop-related code, we use Configuration.getClassLoader().

Returns:

the class loader

getClass

public static <T> Class<? extends T> getClass(String className,
                                              Class<T> clazz)
                                       throws org.apache.hadoop.hive.metastore.api.MetaException

Throws:

org.apache.hadoop.hive.metastore.api.MetaException

newInstance

public static <T> T newInstance(Class<T> theClass,
                                Class<?>[] parameterTypes,
                                Object[] initargs)

Create an object of the given class.

Parameters:

theClass -

parameterTypes - an array of parameterTypes for the constructor

initargs - the list of arguments for the constructor

newInstance

public static <T> T newInstance(Class<T> theClass)

Create an object of the given class using a no-args constructor

Type Parameters:

T - the type of the class to be returned

Parameters:

theClass - class to return new object of

Returns:

an object of the requested type

hostname

public static String hostname()

Returns:

name of current host

lockIdToString

public static String lockIdToString(long extLockId)

Utility method for ACID to normalize logging info. Matches org.apache.hadoop.hive.metastore.api.LockRequest#toString

txnIdToString

public static String txnIdToString(long txnId)

Utility method for ACID to normalize logging info. Matches org.apache.hadoop.hive.metastore.api.LockResponse#toString