com.feedzai.commons.sql.abstraction.engine.handler

Class QueryExceptionHandler

java.lang.Object

com.feedzai.commons.sql.abstraction.engine.handler.QueryExceptionHandler

Direct Known Subclasses:

H2QueryExceptionHandler, MySqlQueryExceptionHandler, OracleQueryExceptionHandler, PostgresSqlQueryExceptionHandler

public class QueryExceptionHandler
extends java.lang.Object

A handler that can be used to disambiguate the meaning of an SQLException thrown when executing a JDBC method. The methods in this class can be used for example to tell whether an exception is retryable, or more in particular if it is a timeout (which can also be considered retryable).

Since:

2.5.1

Author:

José Fidalgo (jose.fidalgo@feedzai.com)

Constructor Summary

Constructors

Constructor and Description
QueryExceptionHandler()

Method Summary

Modifier and Type	Method and Description
DatabaseEngineException	handleException(java.lang.Exception exception, java.lang.String message) Handles the Exception, disambiguating it into a specific PDB Exception and throwing it.
boolean	isRetryableException(java.sql.SQLException exception) Checks if an Exception occurred due to serialization failures in concurrent transactions and may be retried on the client-side.
boolean	isTimeoutException(java.sql.SQLException exception) Indicates if a given exception is a timeout.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryExceptionHandler

public QueryExceptionHandler()

Method Detail

isTimeoutException

public boolean isTimeoutException(java.sql.SQLException exception)

Indicates if a given exception is a timeout. Logic for this may be driver-specific, so drivers that support query timeouts may have to override this method. A timeout exception can also be considered retryable.

Parameters:

exception - The exception to check.

Returns:

true if the exception is a timeout, false otherwise.

isRetryableException

public boolean isRetryableException(java.sql.SQLException exception)

Checks if an Exception occurred due to serialization failures in concurrent transactions and may be retried on the client-side.

Parameters:

exception - The exception to check.

Returns:

true if the exception is retryable, false otherwise.

handleException

public DatabaseEngineException handleException(java.lang.Exception exception,
                                               java.lang.String message)
                                        throws DatabaseEngineException

Handles the Exception, disambiguating it into a specific PDB Exception and throwing it.

If a specific type does not match the info in the provided Exception, throws a DatabaseEngineException.

Parameters:

exception - The exception to handle.

message - The message to associate with the thrown exception.

Returns:

a DatabaseEngineException (declared, but only to keep Java type system happy; this method will always throw an exception).

Throws:

DatabaseEngineException

Since:

2.5.1