Package org.apache.solr.core

Interface CloseHook

public interface CloseHook
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)

  • Method Summary

    Modifier and Type
    Method
    Description
    default 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.
    default 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.

  • Method Details

    • preClose

      default 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 block the process of shutting down a given SolrCore instance.
      Parameters:
      core - SolrCore object that is shutting down / closing

    • postClose

      default 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 block the process of shutting down a given SolrCore instance.

      Parameters:
      core - SolrCore object that is shutting down / closing