com.github.robozonky.internal.util.functional.Memoizer Maven / Gradle / Ivy
/*
* Copyright 2020 The RoboZonky Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.github.robozonky.internal.util.functional;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Supplier;
public final class Memoizer {
private final Map memoizationCache = new ConcurrentHashMap<>(0);
public static Function memoize(final Function function) {
return new Memoizer().doMemoize(function);
}
public static Supplier memoize(final Supplier supplier) {
Function memoized = memoize(input -> supplier.get());
return () -> memoized.apply(true);
}
private Function doMemoize(final Function function) {
return input -> memoizationCache.computeIfAbsent(input, function);
}
}