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com.sigmadynamics.server.DataServices.DatabaseProvider
Class DefaultDeadlockHandler

java.lang.Object
com.sigmadynamics.server.DataServices.DatabaseProvider.DefaultDeadlockHandler

All Implemented Interfaces:

DeadlockHandler

public class DefaultDeadlockHandler

extends java.lang.Object

implements DeadlockHandler

Constructor Summary

DefaultDeadlockHandler()

Method Summary

void	clear()
java.sql.SQLException	deadlockCheck(java.sql.SQLException e) This method checks to see whether an exception is for a deadlock.
java.sql.SQLException	getDeadlockException()
int	getRetryCount()
boolean	isDeadlockException(java.sql.SQLException e)

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultDeadlockHandler

public DefaultDeadlockHandler()

Method Detail

isDeadlockException

public boolean isDeadlockException(java.sql.SQLException e)

Specified by:

isDeadlockException in interface DeadlockHandler

clear

public void clear()

Specified by:

clear in interface DeadlockHandler

getRetryCount

public int getRetryCount()

Specified by:

getRetryCount in interface DeadlockHandler

getDeadlockException

public java.sql.SQLException getDeadlockException()

Specified by:

getDeadlockException in interface DeadlockHandler

Returns:

Returns the deadlock exception if any

deadlockCheck

public java.sql.SQLException deadlockCheck(java.sql.SQLException e)

This method checks to see whether an exception is for a deadlock. If it isn't, then it just returns the exception. If it is for a deadlock, then it checks whether the number of retries has reached the maximum and, if so, returns the exception. If it still wants to retry, then it does any sleeping that it's going to do and then returns a null.

It is important that the caller either calls clear when the original operation has succeeded or if it receives an exception for which it doesn't call this method so that the count value is reset properly.

Specified by:

deadlockCheck in interface DeadlockHandler

Parameters:

e - the original exception that should be checked

Returns:

Either an exception that the caller will probably throw or null to indicate that it was a deadlock exception and the caller should retry the operation.

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