org.quartz.impl.jdbcjobstore
Class UpdateLockRowSemaphore

java.lang.Object
  extended by org.quartz.impl.jdbcjobstore.DBSemaphore
      extended by 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)


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