kodo.jdbc.kernel
Class TableLockUpdateManager

java.lang.Object
  org.apache.openjpa.jdbc.kernel.AbstractUpdateManager
      kodo.jdbc.kernel.AutoOrderUpdateManager
          kodo.jdbc.kernel.TableLockUpdateManager

All Implemented Interfaces:

UpdateManager, Configurable

public class TableLockUpdateManager
extends AutoOrderUpdateManager

Example update manager, capable of statement batching, that ignores foreign keys and autoincrement, but optimizes for table level locking. Esp. important when using table level locking and trying to avoid deadlocks.

Nested Class Summary

protected static class

TableLockUpdateManager.TableRows Rows for a particular table.

Nested classes/interfaces inherited from class kodo.jdbc.kernel.AutoOrderUpdateManager

AutoOrderUpdateManager.SQLComparator

Nested classes/interfaces inherited from class org.apache.openjpa.jdbc.kernel.AbstractUpdateManager

AbstractUpdateManager.CustomMapping

Field Summary

Fields inherited from class kodo.jdbc.kernel.AutoOrderUpdateManager

batch, maxBatch, sqlComparator

Fields inherited from class org.apache.openjpa.jdbc.kernel.AbstractUpdateManager

conf, dict

Constructor Summary

TableLockUpdateManager()

Method Summary

protected Collection	flush(RowManager rowMgr, PreparedStatementManager psMgr, Collection exceps)
protected RowManager	newRowManager()
boolean	orderDirty()
protected Collection	sortTables(Collection trs) Sort TableLockUpdateManager.TableRows by table.

Methods inherited from class kodo.jdbc.kernel.AutoOrderUpdateManager

flush, getMaximizeBatchSize, newPreparedStatementManager, setConfiguration, setMaximizeBatchSize

Methods inherited from class org.apache.openjpa.jdbc.kernel.AbstractUpdateManager

addException, delete, endConfiguration, flush, insert, populateRowManager, startConfiguration, update, updateIndicators

Methods inherited from class java.lang.Object

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

Constructor Detail

TableLockUpdateManager

public TableLockUpdateManager()

Method Detail

orderDirty

public boolean orderDirty()

newRowManager

protected RowManager newRowManager()

Specified by:

newRowManager in class AbstractUpdateManager

flush

protected Collection flush(RowManager rowMgr,
                           PreparedStatementManager psMgr,
                           Collection exceps)

Specified by:

flush in class AbstractUpdateManager

sortTables

protected Collection sortTables(Collection trs)

Sort TableLockUpdateManager.TableRows by table. This implementation sorts tables lexically by table name. This is good for avoiding deadlocks in systems with table level locking. Some orderings may avoid deadlocks and be more scalable. E.g. sorting such that certain tables always come last will reduce the amount of time that those tables are locked. Sort order should probably be constant, though, in order to avoid deadlocks.