org.apache.cassandra.service

Class SSTablesGlobalTracker

java.lang.Object

org.apache.cassandra.service.SSTablesGlobalTracker

All Implemented Interfaces:

INotificationConsumer

public class SSTablesGlobalTracker
extends java.lang.Object
implements INotificationConsumer

Tracks all sstables in use on the local node.

Each table tracks its own SSTables in ColumnFamilyStore (through Tracker) for most purposes, but this class groups information we need on all the sstables the node has.

Constructor Summary

Constructors

Constructor and Description
SSTablesGlobalTracker(SSTableFormat.Type currentSSTableFormat)

Method Summary

Modifier and Type	Method and Description
void	handleNotification(INotification notification, java.lang.Object sender)
boolean	register(INotificationConsumer subscriber) Register a new subscriber to this tracker.
boolean	unregister(INotificationConsumer subscriber) Unregister a subscriber from this tracker.
java.util.Set<VersionAndType>	versionsInUse() The set of all sstable versions currently in use on this node.

Methods inherited from class java.lang.Object

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

Constructor Detail

SSTablesGlobalTracker

public SSTablesGlobalTracker(SSTableFormat.Type currentSSTableFormat)

Method Detail

versionsInUse

public java.util.Set<VersionAndType> versionsInUse()

The set of all sstable versions currently in use on this node.

register

public boolean register(INotificationConsumer subscriber)

Register a new subscriber to this tracker. Registered subscribers are currently notified when the set of sstable versions in use changes, using a SSTablesVersionsInUseChangeNotification.

Parameters:

subscriber - the new subscriber to register. If this subscriber is already registered, this method does nothing (meaning that even if a subscriber is registered multiple times, it will only be notified once on every change).

Returns:

whether the subscriber was register (so whether it was not already registered).

unregister

public boolean unregister(INotificationConsumer subscriber)

Unregister a subscriber from this tracker.

Parameters:

subscriber - the subscriber to unregister. If this subscriber is not registered, this method does nothing.

Returns:

whether the subscriber was unregistered (so whether it was registered subscriber of this tracker).

handleNotification

public void handleNotification(INotification notification,
                               java.lang.Object sender)

Specified by:

handleNotification in interface INotificationConsumer