org.apache.ignite.events

Class CacheQueryReadEvent<K,V>

java.lang.Object

org.apache.ignite.events.EventAdapter

org.apache.ignite.events.CacheQueryReadEvent<K,V>

All Implemented Interfaces:

Serializable, Comparable<Event>, Event

public class CacheQueryReadEvent<K,V>
extends EventAdapter

Cache query read 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_CACHE_QUERY_OBJECT_READ, EventType.EVTS_CACHE_QUERY, Serialized Form

Constructor Summary

Constructors

Constructor and Description
CacheQueryReadEvent(ClusterNode node, String msg, int type, String qryType, @Nullable String cacheName, @Nullable String clsName, @Nullable String clause, @Nullable IgniteBiPredicate<K,V> scanQryFilter, @Nullable CacheEntryEventSerializableFilter<K,V> contQryFilter, @Nullable Object[] args, @Nullable UUID subjId, @Nullable String taskName, K key, V val, V oldVal, @Nullable Object row)

Method Summary

Modifier and Type	Method and Description
@Nullable Object[]	arguments() Gets query arguments.
@Nullable String	cacheName() Gets cache name on which query was executed.
@Nullable String	className() Gets queried class name.
@Nullable String	clause() Gets query clause.
@Nullable CacheEntryEventSerializableFilter<K,V>	continuousQueryFilter() Gets continuous query filter.
K	key() Gets read entry key.
V	oldValue() Gets read entry old value (applicable for continuous queries).
String	queryType() Gets query type.
@Nullable Object	row() Gets read results set row.
@Nullable IgniteBiPredicate<K,V>	scanQueryFilter() Gets scan query filter.
@Nullable UUID	subjectId() Gets security subject ID.
@Nullable String	taskName() Gets the name of the task that executed the query (if any).
String	toString()
V	value() Gets read entry value.

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheQueryReadEvent

public CacheQueryReadEvent(ClusterNode node,
                           String msg,
                           int type,
                           String qryType,
                           @Nullable
                           @Nullable String cacheName,
                           @Nullable
                           @Nullable String clsName,
                           @Nullable
                           @Nullable String clause,
                           @Nullable
                           @Nullable IgniteBiPredicate<K,V> scanQryFilter,
                           @Nullable
                           @Nullable CacheEntryEventSerializableFilter<K,V> contQryFilter,
                           @Nullable
                           @Nullable Object[] args,
                           @Nullable
                           @Nullable UUID subjId,
                           @Nullable
                           @Nullable String taskName,
                           @Nullable
                           K key,
                           @Nullable
                           V val,
                           @Nullable
                           V oldVal,
                           @Nullable
                           @Nullable Object row)

Parameters:

node - Node where event was fired.

msg - Event message.

type - Event type.

cacheName - Cache name.

clsName - Class name.

clause - Clause.

scanQryFilter - Scan query filter.

args - Query arguments.

subjId - Security subject ID.

key - Key.

val - Value.

oldVal - Old value.

Method Detail

queryType

public String queryType()

Gets query type.

Returns:

Query type. Can be "SQL", "SQL_FIELDS", "FULL_TEXT", "SCAN", "CONTINUOUS" or "SPI".

cacheName

@Nullable
public @Nullable String cacheName()

Gets cache name on which query was executed.

Returns:

Cache name.

className

@Nullable
public @Nullable String className()

Gets queried class name.

Applicable for SQL and @{code full text} queries.

Returns:

Queried class name.

clause

@Nullable
public @Nullable String clause()

Gets query clause.

Applicable for SQL, SQL fields and @{code full text} queries.

Returns:

Query clause.

scanQueryFilter

@Nullable
public @Nullable IgniteBiPredicate<K,V> scanQueryFilter()

Gets scan query filter.

Applicable for scan queries.

Returns:

Scan query filter.

continuousQueryFilter

@Nullable
public @Nullable CacheEntryEventSerializableFilter<K,V> continuousQueryFilter()

Gets continuous query filter.

Applicable for continuous queries.

Returns:

Continuous query filter.

arguments

@Nullable
public @Nullable Object[] arguments()

Gets query arguments.

Applicable for SQL and SQL fields queries.

Returns:

Query arguments.

subjectId

@Nullable
public @Nullable UUID subjectId()

Gets security subject ID.

Returns:

Security subject ID.

taskName

@Nullable
public @Nullable String taskName()

Gets the name of the task that executed the query (if any).

Returns:

Task name.

key

@Nullable
public K key()

Gets read entry key.

Returns:

Key.

value

@Nullable
public V value()

Gets read entry value.

Returns:

Value.

oldValue

@Nullable
public V oldValue()

Gets read entry old value (applicable for continuous queries).

Returns:

Old value.

row

@Nullable
public @Nullable Object row()

Gets read results set row.

Returns:

Result row.

toString

public String toString()

Overrides:

toString in class EventAdapter