Package aQute.bnd.memoize

Class RefreshingMemoizingSupplier<T>

java.lang.Object

aQute.bnd.memoize.RefreshingMemoizingSupplier<T>

All Implemented Interfaces:

Memoize<T>, java.util.function.Supplier<T>

class RefreshingMemoizingSupplier<T>
extends java.lang.Object
implements Memoize<T>

The object can exist in one of two states:

• expired which means that System.nanoTime is greater than timebound. memoized may hold an expired value or null. The object transitions to this state when time_to_live elapses. This is the initial state. From this state, the object transitions to valued when @{code get} is called.
• valued which means that System.nanoTime is less than timebound. memoized holds the current value.

Field Summary

Fields

Modifier and Type	Field	Description
private T	memoized
private java.util.function.Supplier<? extends T>	supplier
private long	time_to_live
private long	timebound

Constructor Summary

Constructors

Constructor	Description
RefreshingMemoizingSupplier(java.util.function.Supplier<? extends T> supplier, long time_to_live, java.util.concurrent.TimeUnit unit)

Method Summary

Modifier and Type	Method	Description
T	get()	Get the memoized value.
boolean	isPresent()	If a value is memoized, return true.
T	peek()	Peek the memoized value, if any.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface aQute.bnd.memoize.Memoize

accept, filter, flatMap, ifPresent, map

Field Detail

supplier

private final java.util.function.Supplier<? extends T> supplier

time_to_live

private final long time_to_live

timebound

private volatile long timebound

memoized

private T memoized

Constructor Detail

RefreshingMemoizingSupplier

RefreshingMemoizingSupplier(java.util.function.Supplier<? extends T> supplier,
                            long time_to_live,
                            java.util.concurrent.TimeUnit unit)

Method Detail

get

public T get()

Description copied from interface: Memoize

Get the memoized value.

Specified by:

get in interface Memoize<T>

Specified by:

get in interface java.util.function.Supplier<T>

Returns:

The memoized value.

peek

public T peek()

Description copied from interface: Memoize

Peek the memoized value, if any.

This method will not result in a call to the source supplier.

Specified by:

peek in interface Memoize<T>

Returns:

The memoized value if a value is memoized; otherwise null.

isPresent

public boolean isPresent()

Description copied from interface: Memoize

If a value is memoized, return true. Otherwise return false.

This method will not result in a call to the source supplier.

Specified by:

isPresent in interface Memoize<T>

Returns:

true if a value is memoized; otherwise false.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object