org.apache.ignite.events

Class TaskWithAttributesEvent

java.lang.Object

org.apache.ignite.events.EventAdapter

org.apache.ignite.events.TaskEvent

org.apache.ignite.events.TaskWithAttributesEvent

All Implemented Interfaces:

Serializable, Comparable<Event>, Event

public class TaskWithAttributesEvent
extends TaskEvent

Grid task event.

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

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

User can also wait for events using method IgniteEvents.waitForLocal(org.apache.ignite.lang.IgnitePredicate, int...).

Events and Performance

Note that by default all events in Ignite are enabled and therefore generated and stored by whatever event storage SPI is configured. Ignite 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 IgniteConfiguration.getIncludeEventTypes() method in Ignite configuration. Note that certain events are required for Ignite's internal operations and such events will still be generated but not stored by event storage SPI if they are disabled in Ignite configuration.

See Also:

EventType.EVT_TASK_FAILED, EventType.EVT_TASK_FINISHED, EventType.EVT_TASK_REDUCED, EventType.EVT_TASK_STARTED, EventType.EVT_TASK_SESSION_ATTR_SET, EventType.EVT_TASK_TIMEDOUT, EventType.EVTS_TASK_EXECUTION, Serialized Form

Constructor Summary

Constructors

Constructor and Description
TaskWithAttributesEvent(ClusterNode node, String msg, int type, IgniteUuid sesId, String taskName, String taskClsName, boolean internal, @Nullable UUID subjId, Map<Object,Object> attributes)

Method Summary

Modifier and Type	Method and Description
Map<Object,Object>	attributes() Gets map of attributes from attached task session.
String	toString()

Methods inherited from class org.apache.ignite.events.TaskEvent

internal, shortDisplay, subjectId, taskClassName, taskName, taskSessionId

Methods inherited from class org.apache.ignite.events.EventAdapter

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

TaskWithAttributesEvent

public TaskWithAttributesEvent(ClusterNode node,
                               String msg,
                               int type,
                               IgniteUuid sesId,
                               String taskName,
                               String taskClsName,
                               boolean internal,
                               @Nullable
                               @Nullable UUID subjId,
                               Map<Object,Object> attributes)

Parameters:

node - Node.

msg - Optional message.

type - Event type.

sesId - Task session ID.

taskName - Task name.

taskClsName - Task class name.

internal - Task is internal.

subjId - Subject ID.

attributes - Task session attributes.

Method Detail

attributes

public Map<Object,Object> attributes()

Gets map of attributes from attached task session.

Returns:

Attributes from task session.

toString

public String toString()

Overrides:

toString in class TaskEvent