io.hypersistence.optimizer.hibernate.event.session

Class NPlusOneQueryEntityFetchingEvent

java.lang.Object

io.hypersistence.optimizer.core.event.AbstractEvent

io.hypersistence.optimizer.hibernate.event.session.SessionEvent

io.hypersistence.optimizer.hibernate.event.session.NPlusOneQueryEntityFetchingEvent

All Implemented Interfaces:

Event, Serializable

public class NPlusOneQueryEntityFetchingEvent
extends SessionEvent

The NPlusOneQueryEntityFetchingEvent indicates that an entity has been fetched several times using secondary SQL queries instead of being fetched in one query using a JOIN FETCH clause. N+1 query issues can cause significant performance issues because, even if each query is fast to execute, doing that tens or hundreds of times just adds up, and the more the data grows with time, the bigger the performance penalty will get.

Since:

2.6.0

Author:

Vlad Mihalcea

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface io.hypersistence.optimizer.core.event.Event

Event.Priority

Field Summary

Fields inherited from interface io.hypersistence.optimizer.core.event.Event

HIDDEN_DESCRIPTION

Constructor Summary

Constructors

Constructor and Description
NPlusOneQueryEntityFetchingEvent()

Method Summary

Modifier and Type	Method and Description
Event.Priority	getPriority() Get the Event.Priority of this Event

Methods inherited from class java.lang.Object

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

Constructor Detail

NPlusOneQueryEntityFetchingEvent

public NPlusOneQueryEntityFetchingEvent()

Method Detail

getPriority

public Event.Priority getPriority()

Get the Event.Priority of this Event

Specified by:

getPriority in interface Event

Overrides:

getPriority in class SessionEvent

Returns:

the Event.Priority of this Event