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    • io.fluxcapacitor.javaclient.persisting.caching.SelectiveCache Maven / Gradle / Ivy

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    /*
 * Copyright (c) Flux Capacitor IP B.V. or its affiliates. All Rights Reserved.
 *
 * 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.fluxcapacitor.javaclient.persisting.caching;

import io.fluxcapacitor.common.Registration;
import io.fluxcapacitor.common.caching.Cache;
import io.fluxcapacitor.common.caching.CacheEvictionEvent;
import io.fluxcapacitor.common.caching.DefaultCache;
import io.fluxcapacitor.javaclient.modeling.Entity;
import lombok.AllArgsConstructor;

import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;

@AllArgsConstructor
public class SelectiveCache implements Cache {
    public static Predicate aggregateSelector(Class type) {
        return v -> {
            if (v instanceof Entity aggregateRoot) {
                return Optional.ofNullable(aggregateRoot.get()).map(r -> type.isAssignableFrom(r.getClass()))
                        .orElseGet(() -> type.isAssignableFrom(aggregateRoot.type()));
            }
            return false;
        };
    }

    private final Cache delegate;
    private final Predicate selector;
    private final Cache nextCache;

    public SelectiveCache(Cache nextCache, Predicate selector) {
        this(new DefaultCache(), selector, nextCache);
    }

    @Override
    public Object put(Object id, Object value) {
        if (selector.test(value)) {
            Object delegateValue = delegate.put(id, value);
            Object nextCacheValue = nextCache.remove(id);
            return delegateValue == null ? nextCacheValue : delegateValue;
        }
        Object nextCacheValue = nextCache.put(id, value);
        Object delegateValue = delegate.remove(id);
        return nextCacheValue == null ? delegateValue : nextCacheValue;
    }

    @Override
    public Object putIfAbsent(Object id, Object value) {
        if (selector.test(value)) {
            Object delegateValue = delegate.putIfAbsent(id, value);
            Object nextCacheValue = nextCache.remove(id);
            return delegateValue == null ? nextCacheValue : delegateValue;
        }
        Object nextCacheValue = nextCache.putIfAbsent(id, value);
        Object delegateValue = delegate.remove(id);
        return nextCacheValue == null ? delegateValue : nextCacheValue;
    }

    @Override
    public  T computeIfAbsent(Object id, Function mappingFunction) {
        return compute(id, (k, v) -> v == null ? mappingFunction.apply(id) : v);
    }

    @Override
    public  T computeIfPresent(Object id, BiFunction mappingFunction) {
        return compute(id, (k, v) -> v == null ? null : mappingFunction.apply(k, v));
    }

    @Override
    public  T compute(Object id, BiFunction mappingFunction) {
        AtomicReference result = new AtomicReference<>();
        T nextCacheResult = nextCache.compute(id, (k, v) -> {
            T delegateResult = delegate.compute(id, (k2, v2) -> {
                T r = mappingFunction.apply(id, v2 == null ? v : v2);
                result.set(r);
                if (selector.test(r)) {
                    return r;
                }
                return null;
            });
            if (selector.test(delegateResult)) {
                result.set(delegateResult);
                return null;
            }
            return result.get();
        });
        return nextCacheResult == null ? result.get() : nextCacheResult;
    }

    @Override
    public  T get(Object id) {
        return Optional.ofNullable(delegate.get(id)).orElseGet(() -> nextCache.get(id));
    }

    @Override
    public boolean containsKey(Object id) {
        return delegate.containsKey(id) || nextCache.containsKey(id);
    }

    @Override
    public  T remove(Object id) {
        T delegateValue = delegate.remove(id);
        T nextCacheValue = nextCache.remove(id);
        return delegateValue == null ? nextCacheValue : delegateValue;
    }

    @Override
    public void clear() {
        delegate.clear();
        nextCache.clear();
    }

    @Override
    public  void modifyEach(BiFunction modifierFunction) {
        delegate.modifyEach(modifierFunction);
        nextCache.modifyEach(modifierFunction);
    }

    @Override
    public int size() {
        return delegate.size() + nextCache.size();
    }

    @Override
    public Registration registerEvictionListener(Consumer listener) {
        return delegate.registerEvictionListener(listener).merge(nextCache.registerEvictionListener(listener));
    }

    @Override
    public void close() {
        delegate.close();
        nextCache.close();
    }
}
    
    
    
    

    




    
    
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