org.multiverse.api.exceptions
Class SpeculativeConfigurationError

java.lang.Object
  java.lang.Throwable
      java.lang.Error
          org.multiverse.api.exceptions.ControlFlowError
              org.multiverse.api.exceptions.SpeculativeConfigurationError

All Implemented Interfaces:

Serializable

public class SpeculativeConfigurationError
extends ControlFlowError

A ControlFlowError thrown for dealing with the speculative configuration mechanism.

Multiverse uses a speculative configuration mechanism if enabled makes certain optimizations possible. E.g. one of the optimizations is to use different Txn implementations that are optimized for certain transaction lengths. As long as the speculation is not violated, you will get better performance than when a more heavy weight transaction/configuration.

So ControlFlowErrors are not something bad, but just a way for the STM to figure out what the cheapest settings are for performance/scalability.

Unexpected retries

Because a transaction can fail on a speculative failure more than once, it could be that the transaction is retried. Normally this is not an issue, since the transaction will be retried, so is invisible. And once the TxnExecutor has learned, it will not make the same mistakes again, but if you do io (e.g. print to the System.out or do logging) you can expect to see aborts, even though there is no other reason to. Speculative behavior can be turned of (either on the Txn or STM level) but you will not get the best out of performance. For the speculative behavior to learn, it is important that the TxnExecutor is reused.

Author:

Peter Veentjer.

See Also:

TxnFactoryBuilder.setSpeculative(boolean), Serialized Form

Field Summary

static SpeculativeConfigurationError

INSTANCE

Constructor Summary

SpeculativeConfigurationError(boolean fillStackTrace)
Creates a SpeculativeConfigurationError.

SpeculativeConfigurationError(String message)
Creates a SpeculativeConfigurationError with the provided message.

SpeculativeConfigurationError(String message, Throwable cause)
Creates a SpeculativeConfigurationError with the provided message and cause.

Method Summary

Methods inherited from class org.multiverse.api.exceptions.ControlFlowError

getStackTrace

Methods inherited from class java.lang.Throwable

fillInStackTrace, getCause, getLocalizedMessage, getMessage, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final SpeculativeConfigurationError INSTANCE

Constructor Detail

SpeculativeConfigurationError

public SpeculativeConfigurationError(boolean fillStackTrace)

Creates a SpeculativeConfigurationError.

Parameters:

fillStackTrace - if the StackTrace should be filled.

SpeculativeConfigurationError

public SpeculativeConfigurationError(String message)

Creates a SpeculativeConfigurationError with the provided message.

Parameters:

message - the message of the exception.

SpeculativeConfigurationError

public SpeculativeConfigurationError(String message,
                                     Throwable cause)

Creates a SpeculativeConfigurationError with the provided message and cause.

Parameters:

message - the message of the exception.

cause - the cause of the exception.