Package tech.guilhermekaua.spigotboot.inventoryapi.internal.state

Class LazyStateImpl<T>

java.lang.Object

tech.guilhermekaua.spigotboot.inventoryapi.internal.state.LazyStateImpl<T>

Type Parameters:

T - the value type

All Implemented Interfaces:

IdentifiableToken, State<T>, StateToken

@Internal
public final class LazyStateImpl<T>
extends Object
implements State<T>, IdentifiableToken

Read-only state token computed once per context on the first read and stored in the session's StateStore; a null result is cached via a private sentinel so the computation never re-runs for that context.

Constructor Summary

Constructors

Constructor	Description
LazyStateImpl(@NotNull View owner, @NotNull TokenTable table, @NotNull Function<ViewContext,T> computation)	Creates and registers the token.

Method Summary

Modifier and Type	Method	Description
T	get(@NotNull ViewContext context)	Reads this token's value for the given context.
int	id()	Returns the table-assigned token id, the index into the per-session state store.
int	tokenId()

Methods inherited from class java.lang.Object

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

Constructor Details

LazyStateImpl

public LazyStateImpl(@NotNull
 @NotNull View owner,
 @NotNull
 @NotNull TokenTable table,
 @NotNull
 @NotNull Function<ViewContext,T> computation)

Creates and registers the token.

Parameters:

owner - the view declaring the token

table - the owner's token table

computation - the once-per-context computation

Throws:

IllegalStateException - when the table is already frozen

Method Details

id

public int id()

Returns the table-assigned token id, the index into the per-session state store.

Returns:

the token id

tokenId

public int tokenId()

Specified by:

tokenId in interface IdentifiableToken

Returns:

the token id assigned by the owning view's token table

get

@Nullable
public T get(@NotNull
 @NotNull ViewContext context)

Description copied from interface: State

Reads this token's value for the given context. Callable from any thread, but values are only coherent on the main thread.

Specified by:

get in interface State<T>

Parameters:

context - an active context of the owning view

Returns:

the current value, possibly null