Package io.deephaven.kv

Class Transaction

java.lang.Object

io.deephaven.kv.Transaction

All Implemented Interfaces:

Composable, Request<TransactionResponse>

public final class Transaction
extends Object
implements Request<TransactionResponse>

A transaction is an if/else construct. On execution, if the getCondition() evaluates to true, then the request(s) as described by getOnConditionTrueOperation() are executed; otherwise, the request(s) as described by getOnConditionFalseOperation() are executed.

Transactions enable application logic to dictate desired atomicity, through the use of compare-and-set like constructions.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.kv.Composable

Composable.Empty

Method Summary

Modifier and Type	Method	Description
String	describe()	An unfiltered description of the Request.
String	describe(RequestVisitorFilter filter)
boolean	equals(Object o)
Condition	getCondition()
Composable	getOnConditionFalseOperation()
Composable	getOnConditionTrueOperation()
TransactionResponse	getResponse()	Should only be called after Request.hasResponse() is true.
int	hashCode()
boolean	hasResponse()
void	traverse(@NotNull RequestVisitor visitor)	Invokes the appropriately typed RequestVisitor method that corresponds to the concrete type of this Request.
static Transaction	txn(@NotNull Condition condition, @NotNull Composable onTrue, @NotNull Composable onFalse)

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.kv.Composable

isEmpty, traverseAll

Methods inherited from interface io.deephaven.kv.Request

getOperations

Method Details

txn

public static Transaction txn(@NotNull
 @NotNull Condition condition,
 @NotNull
 @NotNull Composable onTrue,
 @NotNull
 @NotNull Composable onFalse)

getCondition

public Condition getCondition()

getOnConditionTrueOperation

public Composable getOnConditionTrueOperation()

getOnConditionFalseOperation

public Composable getOnConditionFalseOperation()

traverse

public void traverse(@NotNull
 @NotNull RequestVisitor visitor)

Description copied from interface: Request

Invokes the appropriately typed RequestVisitor method that corresponds to the concrete type of this Request.

Thus, all implementations are essentially visitor.visit((ConcreteType)this).

Specified by:

traverse in interface Request<TransactionResponse>

Parameters:

visitor - the visitor

describe

public String describe()

Description copied from interface: Request

An unfiltered description of the Request. Meant to be used for debugging and development purposes.

Specified by:

describe in interface Request<TransactionResponse>

describe

public String describe(RequestVisitorFilter filter)

hasResponse

public boolean hasResponse()

Specified by:

hasResponse in interface Request<TransactionResponse>

Returns:

true iff the response has been set

getResponse

public TransactionResponse getResponse()

Description copied from interface: Request

Should only be called after Request.hasResponse() is true.

Specified by:

getResponse in interface Request<TransactionResponse>

Returns:

the response

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object