org.quartz.impl.jdbcjobstore

Class UpdateLockRowSemaphore

java.lang.Object

org.quartz.impl.jdbcjobstore.DBSemaphore

org.quartz.impl.jdbcjobstore.UpdateLockRowSemaphore

All Implemented Interfaces:

Constants, Semaphore, StdJDBCConstants, TablePrefixAware

public class UpdateLockRowSemaphore
extends DBSemaphore

Provide thread/resource locking in order to protect resources from being altered by multiple threads at the same time using a db row update.

Note: This Semaphore implementation is useful for databases that do not support row locking via "SELECT FOR UPDATE" type syntax, for example Microsoft SQLServer (MSSQL).

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	INSERT_LOCK
static java.lang.String	UPDATE_FOR_LOCK

Fields inherited from interface org.quartz.impl.jdbcjobstore.StdJDBCConstants

COUNT_MISFIRED_TRIGGERS_IN_STATE, DELETE_ALL_BLOB_TRIGGERS, DELETE_ALL_CALENDARS, DELETE_ALL_CRON_TRIGGERS, DELETE_ALL_JOB_DETAILS, DELETE_ALL_PAUSED_TRIGGER_GRPS, DELETE_ALL_SIMPLE_TRIGGERS, DELETE_ALL_SIMPROP_TRIGGERS, DELETE_ALL_TRIGGERS, DELETE_BLOB_TRIGGER, DELETE_CALENDAR, DELETE_CRON_TRIGGER, DELETE_FIRED_TRIGGER, DELETE_FIRED_TRIGGERS, DELETE_INSTANCES_FIRED_TRIGGERS, DELETE_JOB_DETAIL, DELETE_NO_RECOVERY_FIRED_TRIGGERS, DELETE_PAUSED_TRIGGER_GROUP, DELETE_PAUSED_TRIGGER_GROUPS, DELETE_SCHEDULER_STATE, DELETE_SIMPLE_TRIGGER, DELETE_TRIGGER, INSERT_BLOB_TRIGGER, INSERT_CALENDAR, INSERT_CRON_TRIGGER, INSERT_FIRED_TRIGGER, INSERT_JOB_DETAIL, INSERT_PAUSED_TRIGGER_GROUP, INSERT_SCHEDULER_STATE, INSERT_SIMPLE_TRIGGER, INSERT_TRIGGER, SCHED_NAME_SUBST, SELECT_BLOB_TRIGGER, SELECT_CALENDAR, SELECT_CALENDAR_EXISTENCE, SELECT_CALENDARS, SELECT_CRON_TRIGGER, SELECT_FIRED_TRIGGER, SELECT_FIRED_TRIGGER_GROUP, SELECT_FIRED_TRIGGER_INSTANCE_NAMES, SELECT_FIRED_TRIGGERS, SELECT_FIRED_TRIGGERS_OF_JOB, SELECT_FIRED_TRIGGERS_OF_JOB_GROUP, SELECT_HAS_MISFIRED_TRIGGERS_IN_STATE, SELECT_INSTANCES_FIRED_TRIGGERS, SELECT_INSTANCES_RECOVERABLE_FIRED_TRIGGERS, SELECT_JOB_DETAIL, SELECT_JOB_EXECUTION_COUNT, SELECT_JOB_EXISTENCE, SELECT_JOB_FOR_TRIGGER, SELECT_JOB_GROUPS, SELECT_JOB_NONCONCURRENT, SELECT_JOBS_IN_GROUP, SELECT_JOBS_IN_GROUP_LIKE, SELECT_MISFIRED_TRIGGERS, SELECT_MISFIRED_TRIGGERS_IN_GROUP_IN_STATE, SELECT_MISFIRED_TRIGGERS_IN_STATE, SELECT_NEXT_FIRE_TIME, SELECT_NEXT_TRIGGER_TO_ACQUIRE, SELECT_NUM_CALENDARS, SELECT_NUM_JOBS, SELECT_NUM_TRIGGERS, SELECT_NUM_TRIGGERS_FOR_JOB, SELECT_NUM_TRIGGERS_IN_GROUP, SELECT_PAUSED_TRIGGER_GROUP, SELECT_PAUSED_TRIGGER_GROUPS, SELECT_REFERENCED_CALENDAR, SELECT_SCHEDULER_STATE, SELECT_SCHEDULER_STATES, SELECT_SIMPLE_TRIGGER, SELECT_TRIGGER, SELECT_TRIGGER_DATA, SELECT_TRIGGER_EXISTENCE, SELECT_TRIGGER_FOR_FIRE_TIME, SELECT_TRIGGER_GROUPS, SELECT_TRIGGER_GROUPS_FILTERED, SELECT_TRIGGER_STATE, SELECT_TRIGGER_STATUS, SELECT_TRIGGERS_FOR_CALENDAR, SELECT_TRIGGERS_FOR_JOB, SELECT_TRIGGERS_IN_GROUP, SELECT_TRIGGERS_IN_GROUP_LIKE, SELECT_TRIGGERS_IN_STATE, TABLE_PREFIX_SUBST, UPDATE_BLOB_TRIGGER, UPDATE_CALENDAR, UPDATE_CRON_TRIGGER, UPDATE_FIRED_TRIGGER, UPDATE_JOB_DATA, UPDATE_JOB_DETAIL, UPDATE_JOB_TRIGGER_STATES, UPDATE_JOB_TRIGGER_STATES_FROM_OTHER_STATE, UPDATE_SCHEDULER_STATE, UPDATE_SIMPLE_TRIGGER, UPDATE_TRIGGER, UPDATE_TRIGGER_GROUP_STATE_FROM_STATE, UPDATE_TRIGGER_GROUP_STATE_FROM_STATES, UPDATE_TRIGGER_SKIP_DATA, UPDATE_TRIGGER_STATE, UPDATE_TRIGGER_STATE_FROM_STATE, UPDATE_TRIGGER_STATE_FROM_STATES, UPDATE_TRIGGER_STATES_FROM_OTHER_STATES

Fields inherited from interface org.quartz.impl.jdbcjobstore.Constants

ALIAS_COL_NEXT_FIRE_TIME, ALL_GROUPS_PAUSED, COL_BLOB, COL_CALENDAR, COL_CALENDAR_NAME, COL_CHECKIN_INTERVAL, COL_CRON_EXPRESSION, COL_DESCRIPTION, COL_END_TIME, COL_ENTRY_ID, COL_ENTRY_STATE, COL_FIRED_TIME, COL_INSTANCE_NAME, COL_IS_DURABLE, COL_IS_NONCONCURRENT, COL_IS_UPDATE_DATA, COL_IS_VOLATILE, COL_JOB_CLASS, COL_JOB_DATAMAP, COL_JOB_GROUP, COL_JOB_NAME, COL_LAST_CHECKIN_TIME, COL_LOCK_NAME, COL_MISFIRE_INSTRUCTION, COL_NEXT_FIRE_TIME, COL_PREV_FIRE_TIME, COL_PRIORITY, COL_REPEAT_COUNT, COL_REPEAT_INTERVAL, COL_REQUESTS_RECOVERY, COL_SCHED_TIME, COL_SCHEDULER_NAME, COL_START_TIME, COL_TIME_ZONE_ID, COL_TIMES_TRIGGERED, COL_TRIGGER_GROUP, COL_TRIGGER_NAME, COL_TRIGGER_STATE, COL_TRIGGER_TYPE, DEFAULT_TABLE_PREFIX, STATE_ACQUIRED, STATE_BLOCKED, STATE_COMPLETE, STATE_DELETED, STATE_ERROR, STATE_EXECUTING, STATE_MISFIRED, STATE_PAUSED, STATE_PAUSED_BLOCKED, STATE_WAITING, TABLE_BLOB_TRIGGERS, TABLE_CALENDARS, TABLE_CRON_TRIGGERS, TABLE_FIRED_TRIGGERS, TABLE_JOB_DETAILS, TABLE_LOCKS, TABLE_PAUSED_TRIGGERS, TABLE_SCHEDULER_STATE, TABLE_SIMPLE_TRIGGERS, TABLE_TRIGGERS, TTYPE_BLOB, TTYPE_CAL_INT, TTYPE_CRON, TTYPE_DAILY_TIME_INT, TTYPE_SIMPLE

Constructor Summary

Constructors

Constructor and Description
UpdateLockRowSemaphore()

Method Summary

Modifier and Type	Method and Description
protected void	executeSQL(java.sql.Connection conn, java.lang.String lockName, java.lang.String expandedSQL, java.lang.String expandedInsertSQL) Execute the SQL select for update that will lock the proper database row.
protected java.lang.String	getUpdateLockRowSQL()
void	setUpdateLockRowSQL(java.lang.String updateLockRowSQL)

Methods inherited from class org.quartz.impl.jdbcjobstore.DBSemaphore

getLog, getSchedName, getSchedulerNameLiteral, getSQL, getTablePrefix, isLockOwner, obtainLock, releaseLock, requiresConnection, setInsertSQL, setSchedName, setSQL, setTablePrefix

Methods inherited from class java.lang.Object

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

Field Detail

UPDATE_FOR_LOCK

public static final java.lang.String UPDATE_FOR_LOCK

See Also:

Constant Field Values

INSERT_LOCK

public static final java.lang.String INSERT_LOCK

See Also:

Constant Field Values

Constructor Detail

UpdateLockRowSemaphore

public UpdateLockRowSemaphore()

Method Detail

executeSQL

protected void executeSQL(java.sql.Connection conn,
                          java.lang.String lockName,
                          java.lang.String expandedSQL,
                          java.lang.String expandedInsertSQL)
                   throws LockException

Execute the SQL select for update that will lock the proper database row.

Specified by:

executeSQL in class DBSemaphore

Throws:

LockException

getUpdateLockRowSQL

protected java.lang.String getUpdateLockRowSQL()

setUpdateLockRowSQL

public void setUpdateLockRowSQL(java.lang.String updateLockRowSQL)