org.gridgain.grid.events

Class GridSwapSpaceEvent

java.lang.Object

org.gridgain.grid.events.GridEventAdapter

org.gridgain.grid.events.GridSwapSpaceEvent

All Implemented Interfaces:

Serializable, Comparable<GridEvent>, GridEvent

public class GridSwapSpaceEvent
extends GridEventAdapter

Grid swap space event.

Grid events are used for notification about what happens within the grid. Note that by design GridGain keeps all events generated on the local node locally and it provides APIs for performing a distributed queries across multiple nodes:

• GridEvents.remoteQuery(GridPredicate, long, int...) - asynchronously querying events occurred on the nodes specified, including remote nodes.
• GridEvents.localQuery(GridPredicate, int...) - querying only local events stored on this local node.
• GridEvents.localListen(GridPredicate, int...) - listening to local grid events (events from remote nodes not included).

User can also wait for events using method GridEvents.waitForLocal(GridPredicate, int...).

Events and Performance

Note that by default all events in GridGain are enabled and therefore generated and stored by whatever event storage SPI is configured. GridGain can and often does generate thousands events per seconds under the load and therefore it creates a significant additional load on the system. If these events are not needed by the application this load is unnecessary and leads to significant performance degradation.

It is highly recommended to enable only those events that your application logic requires by using GridConfiguration.getIncludeEventTypes() method in GridGain configuration. Note that certain events are required for GridGain's internal operations and such events will still be generated but not stored by event storage SPI if they are disabled in GridGain configuration.

See Also:

GridEventType.EVT_SWAP_SPACE_DATA_READ, GridEventType.EVT_SWAP_SPACE_DATA_STORED, GridEventType.EVT_SWAP_SPACE_DATA_REMOVED, GridEventType.EVT_SWAP_SPACE_CLEARED, GridEventType.EVT_SWAP_SPACE_DATA_EVICTED, Serialized Form

Constructor Summary

Constructors

Constructor and Description
GridSwapSpaceEvent(GridNode node, String msg, int type, String space) Creates swap space event.

Method Summary

Methods

Modifier and Type	Method and Description
String	shortDisplay() Gets a shortened version of toString() result.
String	space() Gets swap space name.
String	toString()

Methods inherited from class org.gridgain.grid.events.GridEventAdapter

compareTo, equals, hashCode, id, localOrder, message, message, name, node, node, timestamp, type, type

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

GridSwapSpaceEvent

public GridSwapSpaceEvent(GridNode node,
                  String msg,
                  int type,
                  @Nullable
                  String space)

Creates swap space event.

Parameters:

node - Node.

msg - Optional message.

type - Event type.

space - Swap space name (null for default space).

Method Detail

space

@Nullable
public String space()

Gets swap space name.

Returns:

Swap space name or null for default space.

shortDisplay

public String shortDisplay()

Gets a shortened version of toString() result. Suitable for humans to read.

Specified by:

shortDisplay in interface GridEvent

Overrides:

shortDisplay in class GridEventAdapter

Returns:

Shortened version of toString() result.

toString

public String toString()

Overrides:

toString in class GridEventAdapter