com.facebook.buck.util

Class MoreSuppliers

java.lang.Object

com.facebook.buck.util.MoreSuppliers

public final class MoreSuppliers
extends Object

Method Summary

Modifier and Type	Method and Description
static <T> java.util.function.Supplier<T>	memoize(java.util.function.Supplier<T> delegate) Returns a supplier which caches the instance retrieved during the first call to get() and returns that value on subsequent calls to get().
static <T,E extends Exception> ThrowingSupplier<T,E>	memoize(ThrowingSupplier<T,E> delegate, Class<E> exceptionClass) Returns a ThrowingSupplier that caches the result or the exception during the first call to get(), and returns or throws on subsequent calls to get()
static <T> java.util.function.Supplier<T>	weakMemoize(java.util.function.Supplier<T> delegate)

Methods inherited from class java.lang.Object

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

Method Detail

memoize

public static <T> java.util.function.Supplier<T> memoize(java.util.function.Supplier<T> delegate)

Returns a supplier which caches the instance retrieved during the first call to get() and returns that value on subsequent calls to get().

Unlike Guava's Suppliers.memoize(com.google.common.base.Supplier), this version removes the reference to the underlying Supplier once the value is computed. This frees up memory used in lambda captures, at the cost of causing the supplier to be not Serializable.

memoize

public static <T,E extends Exception> ThrowingSupplier<T,E> memoize(ThrowingSupplier<T,E> delegate,
                                                                    Class<E> exceptionClass)

Returns a ThrowingSupplier that caches the result or the exception during the first call to get(), and returns or throws on subsequent calls to get()

weakMemoize

public static <T> java.util.function.Supplier<T> weakMemoize(java.util.function.Supplier<T> delegate)