org.elasticsearch.index.shard

Class RefreshListeners

java.lang.Object

org.elasticsearch.index.shard.RefreshListeners

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, org.apache.lucene.search.ReferenceManager.RefreshListener

public final class RefreshListeners
extends java.lang.Object
implements org.apache.lucene.search.ReferenceManager.RefreshListener, java.io.Closeable

Allows for the registration of listeners that are called when a change becomes visible for search. This functionality is exposed from IndexShard but kept here so it can be tested without standing up the entire thing. When Closeable.close()d it will no longer accept listeners and flush any existing listeners.

Constructor Summary

Constructors

Constructor and Description
RefreshListeners(java.util.function.IntSupplier getMaxRefreshListeners, java.lang.Runnable forceRefresh, java.util.concurrent.Executor listenerExecutor, org.apache.logging.log4j.Logger logger)

Method Summary

Modifier and Type	Method and Description
boolean	addOrNotify(Translog.Location location, java.util.function.Consumer<java.lang.Boolean> listener) Add a listener for refreshes, calling it immediately if the location is already visible.
void	afterRefresh(boolean didRefresh)
void	beforeRefresh()
void	close()
int	pendingCount() The number of pending listeners.
boolean	refreshNeeded() Returns true if there are pending listeners.
void	setTranslog(Translog translog) Setup the translog used to find the last refreshed location.

Methods inherited from class java.lang.Object

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

Constructor Detail

RefreshListeners

public RefreshListeners(java.util.function.IntSupplier getMaxRefreshListeners,
                        java.lang.Runnable forceRefresh,
                        java.util.concurrent.Executor listenerExecutor,
                        org.apache.logging.log4j.Logger logger)

Method Detail

addOrNotify

public boolean addOrNotify(Translog.Location location,
                           java.util.function.Consumer<java.lang.Boolean> listener)

Add a listener for refreshes, calling it immediately if the location is already visible. If this runs out of listener slots then it forces a refresh and calls the listener immediately as well.

Parameters:

location - the location to listen for

listener - for the refresh. Called with true if registering the listener ran it out of slots and forced a refresh. Called with false otherwise.

Returns:

did we call the listener (true) or register the listener to call later (false)?

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException

refreshNeeded

public boolean refreshNeeded()

Returns true if there are pending listeners.

pendingCount

public int pendingCount()

The number of pending listeners.

setTranslog

public void setTranslog(Translog translog)

Setup the translog used to find the last refreshed location.

beforeRefresh

public void beforeRefresh()
                   throws java.io.IOException

Specified by:

beforeRefresh in interface org.apache.lucene.search.ReferenceManager.RefreshListener

Throws:

java.io.IOException

afterRefresh

public void afterRefresh(boolean didRefresh)
                  throws java.io.IOException

Specified by:

afterRefresh in interface org.apache.lucene.search.ReferenceManager.RefreshListener

Throws:

java.io.IOException