org.apache.hadoop.metrics

类 ContextFactory

java.lang.Object

org.apache.hadoop.metrics.ContextFactory

已过时。

in favor of org.apache.hadoop.metrics2 usage.

@Deprecated
@InterfaceAudience.LimitedPrivate(value={"HDFS","MapReduce"})
@InterfaceStability.Evolving
public class ContextFactory
extends Object

Factory class for creating MetricsContext objects. To obtain an instance of this class, use the static getFactory() method.

构造器概要

构造器

限定符	构造器和说明
protected	ContextFactory() 已过时。 Creates a new instance of ContextFactory

方法概要

方法

限定符和类型	方法和说明
Collection<MetricsContext>	getAllContexts() 已过时。 Returns all MetricsContexts built by this factory.
Object	getAttribute(String attributeName) 已过时。 Returns the value of the named attribute, or null if there is no attribute of that name.
String[]	getAttributeNames() 已过时。 Returns the names of all the factory's attributes.
MetricsContext	getContext(String contextName) 已过时。
MetricsContext	getContext(String refName, String contextName) 已过时。 Returns the named MetricsContext instance, constructing it if necessary using the factory's current configuration attributes.
static ContextFactory	getFactory() 已过时。 Returns the singleton ContextFactory instance, constructing it if necessary.
static MetricsContext	getNullContext(String contextName) 已过时。 Returns a "null" context - one which does nothing.
void	removeAttribute(String attributeName) 已过时。 Removes the named attribute if it exists.
void	setAttribute(String attributeName, Object value) 已过时。 Sets the named factory attribute to the specified value, creating it if it did not already exist.

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

ContextFactory

protected ContextFactory()

已过时。

Creates a new instance of ContextFactory

方法详细资料

getAttribute

public Object getAttribute(String attributeName)

已过时。

Returns the value of the named attribute, or null if there is no attribute of that name.

参数:

attributeName - the attribute name

返回:

the attribute value

getAttributeNames

public String[] getAttributeNames()

已过时。

Returns the names of all the factory's attributes.

返回:

the attribute names

setAttribute

public void setAttribute(String attributeName,
                Object value)

已过时。

Sets the named factory attribute to the specified value, creating it if it did not already exist. If the value is null, this is the same as calling removeAttribute.

参数:

attributeName - the attribute name

value - the new attribute value

removeAttribute

public void removeAttribute(String attributeName)

已过时。

Removes the named attribute if it exists.

参数:

attributeName - the attribute name

getContext

public MetricsContext getContext(String refName,
                        String contextName)
                          throws IOException,
                                 ClassNotFoundException,
                                 InstantiationException,
                                 IllegalAccessException

已过时。

Returns the named MetricsContext instance, constructing it if necessary using the factory's current configuration attributes.

When constructing the instance, if the factory property contextName.class exists, its value is taken to be the name of the class to instantiate. Otherwise, the default is to create an instance of org.apache.hadoop.metrics.spi.NullContext, which is a dummy "no-op" context which will cause all metric data to be discarded.

参数:

contextName - the name of the context

返回:

the named MetricsContext

抛出:

IOException

ClassNotFoundException

InstantiationException

IllegalAccessException

getContext

public MetricsContext getContext(String contextName)
                          throws IOException,
                                 ClassNotFoundException,
                                 InstantiationException,
                                 IllegalAccessException

已过时。

抛出:

IOException

ClassNotFoundException

InstantiationException

IllegalAccessException

getAllContexts

public Collection<MetricsContext> getAllContexts()

已过时。

Returns all MetricsContexts built by this factory.

getNullContext

public static MetricsContext getNullContext(String contextName)

已过时。

Returns a "null" context - one which does nothing.

getFactory

public static ContextFactory getFactory()
                                 throws IOException

已过时。

Returns the singleton ContextFactory instance, constructing it if necessary.

When the instance is constructed, this method checks if the file hadoop-metrics.properties exists on the class path. If it exists, it must be in the format defined by java.util.Properties, and all the properties in the file are set as attributes on the newly created ContextFactory instance.

返回:

the singleton ContextFactory instance

抛出:

IOException