org.apache.solr.core

Class CloseHook

java.lang.Object

org.apache.solr.core.CloseHook

public abstract class CloseHook
extends Object

Used to request notification when the core is closed.

Call SolrCore.addCloseHook(org.apache.solr.core.CloseHook) during the SolrCoreAware.inform(SolrCore) method to add a close hook to your object.

The close hook can be useful for releasing objects related to the request handler (for instance, if you have a JDBC DataSource or something like that)

Constructor Summary

Constructors

Constructor and Description
CloseHook()

Method Summary

Modifier and Type	Method and Description
abstract void	postClose(SolrCore core) Method called when the given SolrCore object has been shut down and update handlers and searchers are closed Use this method for post-close clean up operations e.g.
abstract void	preClose(SolrCore core) Method called when the given SolrCore object is closing / shutting down but before the update handler and searcher(s) are actually closed Important: Keep the method implementation as short as possible.

Methods inherited from class java.lang.Object

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

Constructor Detail

CloseHook

public CloseHook()

Method Detail

preClose

public abstract void preClose(SolrCore core)

Method called when the given SolrCore object is closing / shutting down but before the update handler and searcher(s) are actually closed
Important: Keep the method implementation as short as possible. If it were to use any heavy i/o , network connections - it might be a better idea to launch in a separate Thread so as to not to block the process of shutting down a given SolrCore instance.

Parameters:

core - SolrCore object that is shutting down / closing

postClose

public abstract void postClose(SolrCore core)

Method called when the given SolrCore object has been shut down and update handlers and searchers are closed
Use this method for post-close clean up operations e.g. deleting the index from disk.
The core's passed to the method is already closed and therefore, its update handler or searcher should *NOT* be used Important: Keep the method implementation as short as possible. If it were to use any heavy i/o , network connections - it might be a better idea to launch in a separate Thread so as to not to block the process of shutting down a given SolrCore instance.