com.atlassian.confluence.impl.hibernate

Class ResettableTableHiLoGenerator

java.lang.Object

org.hibernate.id.enhanced.SequenceStyleGenerator

com.atlassian.confluence.impl.hibernate.ResettableTableHiLoGenerator

All Implemented Interfaces:

org.hibernate.boot.model.relational.ExportableProducer, org.hibernate.id.BulkInsertionCapableIdentifierGenerator, org.hibernate.id.Configurable, org.hibernate.id.IdentifierGenerator, org.hibernate.id.PersistentIdentifierGenerator

Direct Known Subclasses:

ResettableTableHiLoGeneratorV5

public class ResettableTableHiLoGenerator
extends org.hibernate.id.enhanced.SequenceStyleGenerator

An implementation of a resettable hi/lo IdentifierGenerator which is compatible with Hibernate 5.2.

hilo

An IdentifierGenerator that returns a Long, constructed using a hi/lo algorithm. The hi value MUST be fetched in a separate transaction to the Session transaction so the generator must be able to obtain a new connection and commit it. Hence this implementation may not be used when the user is supplying connections. In this case a SequenceHiLoGenerator would be a better choice (where supported).

Mapping parameters supported: table, column, max_lo

Note : This class is copied as it is from hibernate atlassian-hibernate5.2-extras (Except a couple of minor changes to replace public synchronization with a private lock. Refactor to make it unit testable)

Since:

7.17

Field Summary

Fields

Modifier and Type	Field and Description
static String	MAX_LO The max_lo parameter

Fields inherited from class org.hibernate.id.enhanced.SequenceStyleGenerator

CONFIG_PREFER_SEQUENCE_PER_ENTITY, CONFIG_SEQUENCE_PER_ENTITY_SUFFIX, DEF_SEQUENCE_NAME, DEF_SEQUENCE_SUFFIX, DEF_VALUE_COLUMN, DEFAULT_INCREMENT_SIZE, DEFAULT_INITIAL_VALUE, FORCE_TBL_PARAM, INCREMENT_PARAM, INITIAL_PARAM, OPT_PARAM, SEQUENCE_PARAM, VALUE_COLUMN_PARAM

Fields inherited from interface org.hibernate.id.PersistentIdentifierGenerator

CATALOG, IDENTIFIER_NORMALIZER, PK, SCHEMA, TABLE, TABLES

Fields inherited from interface org.hibernate.id.IdentifierGenerator

ENTITY_NAME, JPA_ENTITY_NAME

Constructor Summary

Constructors

Constructor and Description
ResettableTableHiLoGenerator()

Method Summary

Modifier and Type	Method and Description
void	configure(org.hibernate.type.Type type, Properties params, org.hibernate.service.ServiceRegistry serviceRegistry)
Serializable	generate(org.hibernate.engine.spi.SharedSessionContractImplementor session, Object obj)
int	getMaxLo() Get the max_lo value, so that we can calculate a valid value for the next_hi DB value, given the ids already allocated in the database.
void	reset() Set the lo value to more than maxLo to force a reset of the hi value.
String[]	sqlCreateStrings(org.hibernate.dialect.Dialect dialect)

Methods inherited from class org.hibernate.id.enhanced.SequenceStyleGenerator

buildDatabaseStructure, buildSequenceStructure, buildTableStructure, determineAdjustedIncrementSize, determineBulkInsertionIdentifierGenerationSelectFragment, determineIncrementSize, determineInitialValue, determineOptimizationStrategy, determineSequenceName, determineValueColumnName, generatorKey, getDatabaseStructure, getIdentifierType, getOptimizer, registerExportables, sqlDropStrings, supportsBulkInsertionIdentifierGeneration

Methods inherited from class java.lang.Object

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

Field Detail

MAX_LO

public static final String MAX_LO

The max_lo parameter

See Also:

Constant Field Values

Constructor Detail

ResettableTableHiLoGenerator

public ResettableTableHiLoGenerator()

Method Detail

configure

public void configure(org.hibernate.type.Type type,
                      Properties params,
                      org.hibernate.service.ServiceRegistry serviceRegistry)

Specified by:

configure in interface org.hibernate.id.Configurable

Overrides:

configure in class org.hibernate.id.enhanced.SequenceStyleGenerator

generate

public Serializable generate(org.hibernate.engine.spi.SharedSessionContractImplementor session,
                             Object obj)
                      throws org.hibernate.HibernateException

Specified by:

generate in interface org.hibernate.id.IdentifierGenerator

Overrides:

generate in class org.hibernate.id.enhanced.SequenceStyleGenerator

Throws:

org.hibernate.HibernateException

getMaxLo

public int getMaxLo()

Get the max_lo value, so that we can calculate a valid value for the next_hi DB value, given the ids already allocated in the database.

reset

public void reset()

Set the lo value to more than maxLo to force a reset of the hi value.

sqlCreateStrings

public String[] sqlCreateStrings(org.hibernate.dialect.Dialect dialect)

Specified by:

sqlCreateStrings in interface org.hibernate.id.PersistentIdentifierGenerator

Overrides:

sqlCreateStrings in class org.hibernate.id.enhanced.SequenceStyleGenerator