Package dev.restate.sdk.common.syscalls

Class Result<T>

java.lang.Object

dev.restate.sdk.common.syscalls.Result<T>

Type Parameters:

T - result type

public abstract class Result<T>
extends Object

Result can be 3 valued:

• Empty
• Value
• Failure

Empty and Value are used to distinguish the logical empty with the null result.

Failure in a ready result is always a user failure, and never a syscall failure, as opposed to SyscallCallback.onCancel(Throwable).

Method Summary

Modifier and Type	Method	Description
static <T> Result<T>	empty()
static <T> Result<T>	failure(TerminalException t)
abstract @Nullable TerminalException	getFailure()
abstract @Nullable T	getValue()
abstract boolean	isEmpty()
abstract boolean	isSuccess()
<U> Result<U>	mapSuccess(Function<T,U> mapper)	Map this result success value.
static <T> Result<T>	success(T value)

Methods inherited from class java.lang.Object

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

Method Details

isSuccess

public abstract boolean isSuccess()

Returns:

true if there is no failure.

isEmpty

public abstract boolean isEmpty()

getValue

public abstract @Nullable T getValue()

Returns:

The success value, or null in case is empty.

getFailure

public abstract @Nullable TerminalException getFailure()

mapSuccess

public <U> Result<U> mapSuccess(Function<T,U> mapper)

Map this result success value. If the mapper throws an exception, this exception will be converted to TerminalException and return a new failed Result.

empty

public static <T> Result<T> empty()

success

public static <T> Result<T> success(T value)

failure

public static <T> Result<T> failure(TerminalException t)