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/*
 * Copyright 2002-2020 the original author or authors.
 *
 * 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
 *
 *      https://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.
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package org.springframework.cache.concurrent;

import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.springframework.cache.support.AbstractValueAdaptingCache;
import org.springframework.core.serializer.support.SerializationDelegate;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

/**
 * Simple {@link org.springframework.cache.Cache} implementation based on the
 * core JDK {@code java.util.concurrent} package.
 *
 * 

Useful for testing or simple caching scenarios, typically in combination * with {@link org.springframework.cache.support.SimpleCacheManager} or * dynamically through {@link ConcurrentMapCacheManager}. * *

Note: As {@link ConcurrentHashMap} (the default implementation used) * does not allow for {@code null} values to be stored, this class will replace * them with a predefined internal object. This behavior can be changed through the * {@link #ConcurrentMapCache(String, ConcurrentMap, boolean)} constructor. * * @author Costin Leau * @author Juergen Hoeller * @author Stephane Nicoll * @since 3.1 * @see ConcurrentMapCacheManager */ public class ConcurrentMapCache extends AbstractValueAdaptingCache { private final String name; private final ConcurrentMap store; @Nullable private final SerializationDelegate serialization; /** * Create a new ConcurrentMapCache with the specified name. * @param name the name of the cache */ public ConcurrentMapCache(String name) { this(name, new ConcurrentHashMap<>(256), true); } /** * Create a new ConcurrentMapCache with the specified name. * @param name the name of the cache * @param allowNullValues whether to accept and convert {@code null} * values for this cache */ public ConcurrentMapCache(String name, boolean allowNullValues) { this(name, new ConcurrentHashMap<>(256), allowNullValues); } /** * Create a new ConcurrentMapCache with the specified name and the * given internal {@link ConcurrentMap} to use. * @param name the name of the cache * @param store the ConcurrentMap to use as an internal store * @param allowNullValues whether to allow {@code null} values * (adapting them to an internal null holder value) */ public ConcurrentMapCache(String name, ConcurrentMap store, boolean allowNullValues) { this(name, store, allowNullValues, null); } /** * Create a new ConcurrentMapCache with the specified name and the * given internal {@link ConcurrentMap} to use. If the * {@link SerializationDelegate} is specified, * {@link #isStoreByValue() store-by-value} is enabled * @param name the name of the cache * @param store the ConcurrentMap to use as an internal store * @param allowNullValues whether to allow {@code null} values * (adapting them to an internal null holder value) * @param serialization the {@link SerializationDelegate} to use * to serialize cache entry or {@code null} to store the reference * @since 4.3 */ protected ConcurrentMapCache(String name, ConcurrentMap store, boolean allowNullValues, @Nullable SerializationDelegate serialization) { super(allowNullValues); Assert.notNull(name, "Name must not be null"); Assert.notNull(store, "Store must not be null"); this.name = name; this.store = store; this.serialization = serialization; } /** * Return whether this cache stores a copy of each entry ({@code true}) or * a reference ({@code false}, default). If store by value is enabled, each * entry in the cache must be serializable. * @since 4.3 */ public final boolean isStoreByValue() { return (this.serialization != null); } @Override public final String getName() { return this.name; } @Override public final ConcurrentMap getNativeCache() { return this.store; } @Override @Nullable protected Object lookup(Object key) { return this.store.get(key); } @SuppressWarnings("unchecked") @Override @Nullable public T get(Object key, Callable valueLoader) { return (T) fromStoreValue(this.store.computeIfAbsent(key, k -> { try { return toStoreValue(valueLoader.call()); } catch (Throwable ex) { throw new ValueRetrievalException(key, valueLoader, ex); } })); } @Override public void put(Object key, @Nullable Object value) { this.store.put(key, toStoreValue(value)); } @Override @Nullable public ValueWrapper putIfAbsent(Object key, @Nullable Object value) { Object existing = this.store.putIfAbsent(key, toStoreValue(value)); return toValueWrapper(existing); } @Override public void evict(Object key) { this.store.remove(key); } @Override public boolean evictIfPresent(Object key) { return (this.store.remove(key) != null); } @Override public void clear() { this.store.clear(); } @Override public boolean invalidate() { boolean notEmpty = !this.store.isEmpty(); this.store.clear(); return notEmpty; } @Override protected Object toStoreValue(@Nullable Object userValue) { Object storeValue = super.toStoreValue(userValue); if (this.serialization != null) { try { return this.serialization.serializeToByteArray(storeValue); } catch (Throwable ex) { throw new IllegalArgumentException("Failed to serialize cache value '" + userValue + "'. Does it implement Serializable?", ex); } } else { return storeValue; } } @Override protected Object fromStoreValue(@Nullable Object storeValue) { if (storeValue != null && this.serialization != null) { try { return super.fromStoreValue(this.serialization.deserializeFromByteArray((byte[]) storeValue)); } catch (Throwable ex) { throw new IllegalArgumentException("Failed to deserialize cache value '" + storeValue + "'", ex); } } else { return super.fromStoreValue(storeValue); } } }





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