org.apache.accumulo.core.conf
Class ObservableConfiguration

java.lang.Object
  org.apache.accumulo.core.conf.AccumuloConfiguration
      org.apache.accumulo.core.conf.ObservableConfiguration

All Implemented Interfaces:

Iterable<Map.Entry<String,String>>

public abstract class ObservableConfiguration
extends AccumuloConfiguration

A configuration that can be observed. Handling of observers is thread-safe.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.accumulo.core.conf.AccumuloConfiguration

AccumuloConfiguration.AllFilter, AccumuloConfiguration.PrefixFilter, AccumuloConfiguration.PropertyFilter

Constructor Summary

ObservableConfiguration()
Creates a new observable configuration.

Method Summary

void	addObserver(ConfigurationObserver co) Adds an observer.
void	expireAllObservers() Expires all observers.
Collection<ConfigurationObserver>	getObservers() Gets the current set of observers.
void	propertiesChanged() Notifies all observers that properties changed.
void	propertyChanged(String key) Notifies all observers that a property changed.
void	removeObserver(ConfigurationObserver co) Removes an observer.

Methods inherited from class org.apache.accumulo.core.conf.AccumuloConfiguration

get, getAllPropertiesWithPrefix, getBoolean, getCount, getDefaultConfiguration, getFraction, getFraction, getMaxFilesPerTablet, getMemoryInBytes, getMemoryInBytes, getPath, getPort, getProperties, getTableConfiguration, getTimeInMillis, getTimeInMillis, instantiateClassProperty, invalidateCache, iterator

Methods inherited from class java.lang.Object

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

Constructor Detail

ObservableConfiguration

public ObservableConfiguration()

Creates a new observable configuration.

Method Detail

addObserver

public void addObserver(ConfigurationObserver co)

Adds an observer.

Parameters:

co - observer

Throws:

NullPointerException - if co is null

removeObserver

public void removeObserver(ConfigurationObserver co)

Removes an observer.

Parameters:

co - observer

getObservers

public Collection<ConfigurationObserver> getObservers()

Gets the current set of observers. The returned collection is a snapshot, and changes to it do not reflect back to the configuration.

Returns:

observers

expireAllObservers

public void expireAllObservers()

Expires all observers.

propertyChanged

public void propertyChanged(String key)

Notifies all observers that a property changed.

Parameters:

key - configuration property key

propertiesChanged

public void propertiesChanged()

Notifies all observers that properties changed.