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Small library allowing to efficiently assemble entities from querying/merging external datasources or aggregating microservices

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/*
 * Copyright 2024 Sebastien Pelletier
 *
 * 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 io.github.pellse.assembler.caching;

import java.util.function.Function;
import java.util.function.Predicate;

import static java.util.function.Function.identity;

public sealed interface CacheEvent {

    static  Updated updated(R value) {
        return new Updated<>(value);
    }

    static  Removed removed(R value) {
        return new Removed<>(value);
    }

    static  Function> toCacheEvent(Predicate isAddOrUpdateEvent) {
        return toCacheEvent(isAddOrUpdateEvent, identity());
    }

    static  Function> toCacheEvent(Predicate isAddOrUpdateEvent, Function cacheEventValueExtractor) {
        return source -> toCacheEvent(isAddOrUpdateEvent.test(source), cacheEventValueExtractor.apply(source));
    }

    static  CacheEvent toCacheEvent(boolean isAddOrUpdateEvent, R eventValue) {
        return isAddOrUpdateEvent ? updated(eventValue) : removed(eventValue);
    }

    R value();

    record Updated(R value) implements CacheEvent {
    }

    record Removed(R value) implements CacheEvent {
    }
}