org.jowidgets.util

Interface IFutureValue<VALUE_TYPE>

Type Parameters:

VALUE_TYPE - The type of the value that will be initialized later

All Known Implementing Classes:

FutureValue

public interface IFutureValue<VALUE_TYPE>

A value of a specific type that will be initialized later.

Method Summary

Methods

Modifier and Type	Method and Description
void	addFutureCallback(IFutureValueCallback<VALUE_TYPE> callback) Adds a callback that will be invoked in the following manner: 1.
VALUE_TYPE	getValue() Gets the value if the future is initialized and throw a runtime exception otherwise
boolean	isInitialized()
void	removeFutureCallback(IFutureValueCallback<VALUE_TYPE> callback) Removes a creation callback if no longer interested on the value.

Method Detail

addFutureCallback

void addFutureCallback(IFutureValueCallback<VALUE_TYPE> callback)

Adds a callback that will be invoked in the following manner: 1. If the value is already initialized, the given callback will be invoked immediately 2. If the value was not already initialized, the given callback will be invoked later but immediately after the value was initialized Remark: After the initialize method was invoked on the callback, the callback reference will be cleared automatically on this future, because a future value can not be initialized twice. Clients of this interface may not remove the callback for initialized values manually

Parameters:

callback - The callback that gets the initialized value

removeFutureCallback

void removeFutureCallback(IFutureValueCallback<VALUE_TYPE> callback)

Removes a creation callback if no longer interested on the value.

Parameters:

callback - The callback to remove

isInitialized

boolean isInitialized()

Returns:

True if the value was already initialized, false otherwise

getValue

VALUE_TYPE getValue()

Gets the value if the future is initialized and throw a runtime exception otherwise

Returns:

The value of the future if initialized (may be null)

Throws:

java.lang.IllegalStateException - if the future is not already initialized