kodo.jdbc.runtime
Class TableLockUpdateManagerImpl

java.lang.Object
  |
  +--kodo.jdbc.runtime.UpdateManagerImpl
        |
        +--kodo.jdbc.runtime.TableLockUpdateManagerImpl

All Implemented Interfaces:

Configurable, UpdateManager

public class TableLockUpdateManagerImpl

extends UpdateManagerImpl

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.

Constructor Summary

TableLockUpdateManagerImpl()

Method Summary

protected Collection	flush(RowManagerImpl rowMgr, kodo.jdbc.runtime.PreparedStatementManager psMgr, Collection exceps) Flush all rows of the given row manager.
protected Collection	sortTables(Collection trms) Sort tables.

Methods inherited from class kodo.jdbc.runtime.UpdateManagerImpl

addException, endConfiguration, flush, flush, getMaximizeBatchSize, setConfiguration, setMaximizeBatchSize, startConfiguration

Methods inherited from class java.lang.Object

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

Constructor Detail

TableLockUpdateManagerImpl

public TableLockUpdateManagerImpl()

Method Detail

flush

protected Collection flush(RowManagerImpl rowMgr,
                           kodo.jdbc.runtime.PreparedStatementManager psMgr,
                           Collection exceps)

Description copied from class: UpdateManagerImpl

Flush all rows of the given row manager. Add exceptions to exceps (which may start out as null) using UpdateManagerImpl.addException(java.util.Collection, java.lang.Exception). Return exceps.

Overrides:

flush in class UpdateManagerImpl

sortTables

protected Collection sortTables(Collection trms)

Sort tables. 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.