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

static java.lang.String

UPDATE_FOR_LOCK

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

COUNT_MISFIRED_TRIGGERS_IN_STATES, DELETE_BLOB_TRIGGER, DELETE_CALENDAR, DELETE_CRON_TRIGGER, DELETE_FIRED_TRIGGER, DELETE_FIRED_TRIGGERS, DELETE_INSTANCES_FIRED_TRIGGERS, DELETE_JOB_DETAIL, DELETE_JOB_LISTENERS, DELETE_NO_RECOVERY_FIRED_TRIGGERS, DELETE_PAUSED_TRIGGER_GROUP, DELETE_PAUSED_TRIGGER_GROUPS, DELETE_SCHEDULER_STATE, DELETE_SIMPLE_TRIGGER, DELETE_TRIGGER, DELETE_TRIGGER_LISTENERS, DELETE_VOLATILE_FIRED_TRIGGERS, INSERT_BLOB_TRIGGER, INSERT_CALENDAR, INSERT_CRON_TRIGGER, INSERT_FIRED_TRIGGER, INSERT_JOB_DETAIL, INSERT_JOB_LISTENER, INSERT_PAUSED_TRIGGER_GROUP, INSERT_SCHEDULER_STATE, INSERT_SIMPLE_TRIGGER, INSERT_TRIGGER, INSERT_TRIGGER_LISTENER, 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_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_LISTENERS, SELECT_JOB_STATEFUL, SELECT_JOBS_IN_GROUP, SELECT_MISFIRED_TRIGGERS, SELECT_MISFIRED_TRIGGERS_IN_GROUP_IN_STATE, SELECT_MISFIRED_TRIGGERS_IN_STATE, SELECT_MISFIRED_TRIGGERS_IN_STATES, 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_STATEFUL_JOBS_OF_TRIGGER_GROUP, SELECT_TRIGGER, SELECT_TRIGGER_DATA, SELECT_TRIGGER_EXISTENCE, SELECT_TRIGGER_FOR_FIRE_TIME, SELECT_TRIGGER_GROUPS, SELECT_TRIGGER_LISTENERS, SELECT_TRIGGER_STATE, SELECT_TRIGGER_STATUS, SELECT_TRIGGERS_FOR_CALENDAR, SELECT_TRIGGERS_FOR_JOB, SELECT_TRIGGERS_IN_GROUP, SELECT_TRIGGERS_IN_STATE, SELECT_VOLATILE_JOBS, SELECT_VOLATILE_TRIGGERS, TABLE_PREFIX_SUBST, UPDATE_BLOB_TRIGGER, UPDATE_CALENDAR, UPDATE_CRON_TRIGGER, UPDATE_INSTANCES_FIRED_TRIGGER_STATE, 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, UPDATE_TRIGGER_GROUP_STATE_FROM_STATE, UPDATE_TRIGGER_GROUP_STATE_FROM_STATES, UPDATE_TRIGGER_SKIP_DATA, UPDATE_TRIGGER_STATE, UPDATE_TRIGGER_STATE_FROM_OTHER_STATES_BEFORE_TIME, 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_STATEFUL, COL_IS_VOLATILE, COL_JOB_CLASS, COL_JOB_DATAMAP, COL_JOB_GROUP, COL_JOB_LISTENER, 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_START_TIME, COL_TIME_ZONE_ID, COL_TIMES_TRIGGERED, COL_TRIGGER_GROUP, COL_TRIGGER_LISTENER, 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_JOB_LISTENERS, TABLE_LOCKS, TABLE_PAUSED_TRIGGERS, TABLE_SCHEDULER_STATE, TABLE_SIMPLE_TRIGGERS, TABLE_TRIGGER_LISTENERS, TABLE_TRIGGERS, TTYPE_BLOB, TTYPE_CRON, TTYPE_SIMPLE

Constructor Summary

UpdateLockRowSemaphore()

Method Summary

protected void	executeSQL(java.sql.Connection conn, java.lang.String lockName, java.lang.String expandedSQL) 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, getSQL, getTablePrefix, isLockOwner, obtainLock, releaseLock, requiresConnection, 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

Constructor Detail

UpdateLockRowSemaphore

public UpdateLockRowSemaphore()

Method Detail

executeSQL

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