com.apple.foundationdb

Class TransactionOptions

java.lang.Object

com.apple.foundationdb.TransactionOptions

public class TransactionOptions
extends java.lang.Object

A set of options that can be set on a Transaction.

Constructor Summary

Constructors

Constructor and Description
TransactionOptions(OptionConsumer consumer)

Method Summary

Modifier and Type	Method and Description
OptionConsumer	getOptionConsumer() Returns the object on which these options are being set.
void	setAccessSystemKeys() Allows this transaction to read and modify system keys (those that start with the byte 0xFF).
void	setCausalReadDisable()
void	setCausalReadRisky() The read version will be committed, and usually will be the latest committed, but might not be the latest committed in the event of a fault or partition.
void	setCausalWriteRisky() The transaction, if not self-conflicting, may be committed a second time after commit succeeds, in the event of a fault.
void	setDebugRetryLogging(java.lang.String value)
void	setDebugTransactionIdentifier(java.lang.String value) Sets a client provided identifier for the transaction that will be used in scenarios like tracing or profiling.
void	setDurabilityDatacenter()
void	setDurabilityDevNullIsWebScale() Deprecated.
void	setDurabilityRisky()
void	setInitializeNewDatabase() This is a write-only transaction which sets the initial configuration.
void	setLockAware() The transaction can read and write to locked databases, and is resposible for checking that it took the lock.
void	setLogTransaction() Enables tracing for this transaction and logs results to the client trace logs.
void	setMaxRetryDelay(long value) Set the maximum amount of backoff delay incurred in the call to onError if the error is retryable.
void	setNextWriteNoWriteConflictRange() The next write performed on this transaction will not generate a write conflict range.
void	setPriorityBatch() Specifies that this transaction should be treated as low priority and that default priority transactions will be processed first.
void	setPrioritySystemImmediate() Specifies that this transaction should be treated as highest priority and that lower priority transactions should block behind this one.
void	setReadAheadDisable() Deprecated.
void	setReadLockAware() The transaction can read from locked databases.
void	setReadSystemKeys() Allows this transaction to read system keys (those that start with the byte 0xFF).
void	setReadYourWritesDisable() Reads performed by a transaction will not see any prior mutations that occured in that transaction, instead seeing the value which was in the database at the transaction's read version.
void	setRetryLimit(long value) Set a maximum number of retries after which additional calls to onError will throw the most recently seen error code.
void	setSnapshotRywDisable() Snapshot read operations will not see the results of writes done in the same transaction.
void	setSnapshotRywEnable() Snapshot read operations will see the results of writes done in the same transaction.
void	setTimeout(long value) Set a timeout in milliseconds which, when elapsed, will cause the transaction automatically to be cancelled.
void	setTransactionLoggingEnable(java.lang.String value) Deprecated.
void	setUsedDuringCommitProtectionDisable() By default, operations that are performed on a transaction while it is being committed will not only fail themselves, but they will attempt to fail other in-flight operations (such as the commit) as well.
void	setUseProvisionalProxies() This option should only be used by tools which change the database configuration.

Methods inherited from class java.lang.Object

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

Constructor Detail

TransactionOptions

public TransactionOptions(OptionConsumer consumer)

Method Detail

setCausalWriteRisky

public void setCausalWriteRisky()

The transaction, if not self-conflicting, may be committed a second time after commit succeeds, in the event of a fault.

setCausalReadRisky

public void setCausalReadRisky()

The read version will be committed, and usually will be the latest committed, but might not be the latest committed in the event of a fault or partition.

setNextWriteNoWriteConflictRange

public void setNextWriteNoWriteConflictRange()

The next write performed on this transaction will not generate a write conflict range. As a result, other transactions which read the key(s) being modified by the next write will not conflict with this transaction. Care needs to be taken when using this option on a transaction that is shared between multiple threads. When setting this option, write conflict ranges will be disabled on the next write operation, regardless of what thread it is on.

setReadYourWritesDisable

public void setReadYourWritesDisable()

Reads performed by a transaction will not see any prior mutations that occured in that transaction, instead seeing the value which was in the database at the transaction's read version. This option may provide a small performance benefit for the client, but also disables a number of client-side optimizations which are beneficial for transactions which tend to read and write the same keys within a single transaction.

setReadAheadDisable

@Deprecated
public void setReadAheadDisable()

Deprecated.

Deprecated.

setDurabilityDevNullIsWebScale

@Deprecated
public void setDurabilityDevNullIsWebScale()

Deprecated.

Deprecated.

setPrioritySystemImmediate

public void setPrioritySystemImmediate()

Specifies that this transaction should be treated as highest priority and that lower priority transactions should block behind this one. Use is discouraged outside of low-level tools.

setPriorityBatch

public void setPriorityBatch()

Specifies that this transaction should be treated as low priority and that default priority transactions will be processed first. Batch priority transactions will also be throttled at load levels smaller than for other types of transactions and may be fully cut off in the event of machine failures. Useful for doing batch work simultaneously with latency-sensitive work.

setInitializeNewDatabase

public void setInitializeNewDatabase()

This is a write-only transaction which sets the initial configuration. This option is designed for use by database system tools only.

setAccessSystemKeys

public void setAccessSystemKeys()

Allows this transaction to read and modify system keys (those that start with the byte 0xFF).

setReadSystemKeys

public void setReadSystemKeys()

Allows this transaction to read system keys (those that start with the byte 0xFF).

setTransactionLoggingEnable

@Deprecated
public void setTransactionLoggingEnable(java.lang.String value)

Deprecated.

Deprecated.

Parameters:

value - String identifier to be used in the logs when tracing this transaction. The identifier must not exceed 100 characters.

setDebugTransactionIdentifier

public void setDebugTransactionIdentifier(java.lang.String value)

Sets a client provided identifier for the transaction that will be used in scenarios like tracing or profiling. Client trace logging or transaction profiling must be separately enabled.

Parameters:

value - String identifier to be used when tracing or profiling this transaction. The identifier must not exceed 100 characters.

setLogTransaction

public void setLogTransaction()

Enables tracing for this transaction and logs results to the client trace logs. The DEBUG_TRANSACTION_IDENTIFIER option must be set before using this option, and client trace logging must be enabled and to get log output.

setTimeout

public void setTimeout(long value)

Set a timeout in milliseconds which, when elapsed, will cause the transaction automatically to be cancelled. Valid parameter values are [0, INT_MAX]. If set to 0, will disable all timeouts. All pending and any future uses of the transaction will throw an exception. The transaction can be used again after it is reset. Prior to API version 610, like all other transaction options, the timeout must be reset after a call to onError. If the API version is 610 or greater, the timeout is not reset after an onError call. This allows the user to specify a longer timeout on specific transactions than the default timeout specified through the transaction_timeout database option without the shorter database timeout cancelling transactions that encounter a retryable error. Note that at all API versions, it is safe and legal to set the timeout each time the transaction begins, so most code written assuming the older behavior can be upgraded to the newer behavior without requiring any modification, and the caller is not required to implement special logic in retry loops to only conditionally set this option.

Parameters:

value - value in milliseconds of timeout

setRetryLimit

public void setRetryLimit(long value)

Set a maximum number of retries after which additional calls to onError will throw the most recently seen error code. Valid parameter values are [-1, INT_MAX]. If set to -1, will disable the retry limit. Prior to API version 610, like all other transaction options, the retry limit must be reset after a call to onError. If the API version is 610 or greater, the retry limit is not reset after an onError call. Note that at all API versions, it is safe and legal to set the retry limit each time the transaction begins, so most code written assuming the older behavior can be upgraded to the newer behavior without requiring any modification, and the caller is not required to implement special logic in retry loops to only conditionally set this option.

Parameters:

value - number of times to retry

setMaxRetryDelay

public void setMaxRetryDelay(long value)

Set the maximum amount of backoff delay incurred in the call to onError if the error is retryable. Defaults to 1000 ms. Valid parameter values are [0, INT_MAX]. If the maximum retry delay is less than the current retry delay of the transaction, then the current retry delay will be clamped to the maximum retry delay. Prior to API version 610, like all other transaction options, the maximum retry delay must be reset after a call to onError. If the API version is 610 or greater, the retry limit is not reset after an onError call. Note that at all API versions, it is safe and legal to set the maximum retry delay each time the transaction begins, so most code written assuming the older behavior can be upgraded to the newer behavior without requiring any modification, and the caller is not required to implement special logic in retry loops to only conditionally set this option.

Parameters:

value - value in milliseconds of maximum delay

setSnapshotRywEnable

public void setSnapshotRywEnable()

Snapshot read operations will see the results of writes done in the same transaction. This is the default behavior.

setSnapshotRywDisable

public void setSnapshotRywDisable()

Snapshot read operations will not see the results of writes done in the same transaction. This was the default behavior prior to API version 300.

setLockAware

public void setLockAware()

The transaction can read and write to locked databases, and is resposible for checking that it took the lock.

setUsedDuringCommitProtectionDisable

public void setUsedDuringCommitProtectionDisable()

By default, operations that are performed on a transaction while it is being committed will not only fail themselves, but they will attempt to fail other in-flight operations (such as the commit) as well. This behavior is intended to help developers discover situations where operations could be unintentionally executed after the transaction has been reset. Setting this option removes that protection, causing only the offending operation to fail.

setReadLockAware

public void setReadLockAware()

The transaction can read from locked databases.

setUseProvisionalProxies

public void setUseProvisionalProxies()

This option should only be used by tools which change the database configuration.

setCausalReadDisable

public void setCausalReadDisable()

setDurabilityDatacenter

public void setDurabilityDatacenter()

setDurabilityRisky

public void setDurabilityRisky()

setDebugRetryLogging

public void setDebugRetryLogging(java.lang.String value)

getOptionConsumer

public OptionConsumer getOptionConsumer()

Returns the object on which these options are being set. Rarely used by client code, since all options should be top-level methods on extending classes.

Returns:

target of option set calls