Package com.github.ambry.clustermap

Class CompositeDataNodeConfigSource

java.lang.Object

com.github.ambry.clustermap.CompositeDataNodeConfigSource

All Implemented Interfaces:

java.lang.AutoCloseable

public class CompositeDataNodeConfigSource
extends java.lang.Object

An implementation of DataNodeConfigSource that combines two sources. The "primary" acts as the source of truth for users of this class, but results obtained are compared against the "secondary" source. This class can be useful for safe migrations between different backing stores.

Constructor Summary

Constructors

Constructor	Description
CompositeDataNodeConfigSource(com.github.ambry.clustermap.DataNodeConfigSource primarySource, com.github.ambry.clustermap.DataNodeConfigSource secondarySource, com.github.ambry.utils.Time time, com.github.ambry.clustermap.DataNodeConfigSourceMetrics metrics)

Method Summary

Modifier and Type	Method	Description
void	addDataNodeConfigChangeListener(DataNodeConfigChangeListener listener)
void	close()
com.github.ambry.clustermap.DataNodeConfig	get(java.lang.String instanceName)
boolean	set(com.github.ambry.clustermap.DataNodeConfig config)

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeDataNodeConfigSource

public CompositeDataNodeConfigSource(com.github.ambry.clustermap.DataNodeConfigSource primarySource,
                                     com.github.ambry.clustermap.DataNodeConfigSource secondarySource,
                                     com.github.ambry.utils.Time time,
                                     com.github.ambry.clustermap.DataNodeConfigSourceMetrics metrics)

Parameters:

primarySource - the source of truth for users of this class.

secondarySource - all operations are also attempted against this source, but if the results of the operation differ from the primary, inconsistencies are just recorded with logs and metrics.

time - a Time instance used for consistency verification.

metrics - a DataNodeConfigSourceMetrics instance to use.

Method Detail

addDataNodeConfigChangeListener

public void addDataNodeConfigChangeListener(DataNodeConfigChangeListener listener)
                                     throws java.lang.Exception

Throws:

java.lang.Exception

set

public boolean set(com.github.ambry.clustermap.DataNodeConfig config)

get

public com.github.ambry.clustermap.DataNodeConfig get(java.lang.String instanceName)

close

public void close()

Specified by:

close in interface java.lang.AutoCloseable