1 files changed, 166 insertions, 0 deletions
diff --git a/spring-context-support/src/main/java/org/springframework/cache/caffeine/CaffeineCache.java b/spring-context-support/src/main/java/org/springframework/cache/caffeine/CaffeineCache.java
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index 00000000..d9fcec58
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+++ b/spring-context-support/src/main/java/org/springframework/cache/caffeine/CaffeineCache.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright 2002-2016 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
+ *
+ *      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 org.springframework.cache.caffeine;
+
+import java.util.concurrent.Callable;
+import java.util.function.Function;
+
+import com.github.benmanes.caffeine.cache.LoadingCache;
+
+import org.springframework.cache.support.AbstractValueAdaptingCache;
+import org.springframework.lang.UsesJava8;
+import org.springframework.util.Assert;
+
+/**
+ * Spring {@link org.springframework.cache.Cache} adapter implementation
+ * on top of a Caffeine {@link com.github.benmanes.caffeine.cache.Cache} instance.
+ *
+ * <p>Requires Caffeine 2.1 or higher.
+ *
+ * @author Ben Manes
+ * @author Juergen Hoeller
+ * @author Stephane Nicoll
+ * @since 4.3
+ */
+@UsesJava8
+public class CaffeineCache extends AbstractValueAdaptingCache {
+
+	private final String name;
+
+	private final com.github.benmanes.caffeine.cache.Cache<Object, Object> cache;
+
+
+	/**
+	 * Create a {@link CaffeineCache} instance with the specified name and the
+	 * given internal {@link com.github.benmanes.caffeine.cache.Cache} to use.
+	 * @param name the name of the cache
+	 * @param cache the backing Caffeine Cache instance
+	 */
+	public CaffeineCache(String name, com.github.benmanes.caffeine.cache.Cache<Object, Object> cache) {
+		this(name, cache, true);
+	}
+
+	/**
+	 * Create a {@link CaffeineCache} instance with the specified name and the
+	 * given internal {@link com.github.benmanes.caffeine.cache.Cache} to use.
+	 * @param name the name of the cache
+	 * @param cache the backing Caffeine Cache instance
+	 * @param allowNullValues whether to accept and convert {@code null}
+	 * values for this cache
+	 */
+	public CaffeineCache(String name, com.github.benmanes.caffeine.cache.Cache<Object, Object> cache,
+			boolean allowNullValues) {
+
+		super(allowNullValues);
+		Assert.notNull(name, "Name must not be null");
+		Assert.notNull(cache, "Cache must not be null");
+		this.name = name;
+		this.cache = cache;
+	}
+
+
+	@Override
+	public final String getName() {
+		return this.name;
+	}
+
+	@Override
+	public final com.github.benmanes.caffeine.cache.Cache<Object, Object> getNativeCache() {
+		return this.cache;
+	}
+
+	@Override
+	public ValueWrapper get(Object key) {
+		if (this.cache instanceof LoadingCache) {
+			Object value = ((LoadingCache<Object, Object>) this.cache).get(key);
+			return toValueWrapper(value);
+		}
+		return super.get(key);
+	}
+
+	@SuppressWarnings("unchecked")
+	@Override
+	public <T> T get(Object key, final Callable<T> valueLoader) {
+		return (T) fromStoreValue(this.cache.get(key, new LoadFunction(valueLoader)));
+	}
+
+	@Override
+	protected Object lookup(Object key) {
+		return this.cache.getIfPresent(key);
+	}
+
+	@Override
+	public void put(Object key, Object value) {
+		this.cache.put(key, toStoreValue(value));
+	}
+
+	@Override
+	public ValueWrapper putIfAbsent(Object key, final Object value) {
+		PutIfAbsentFunction callable = new PutIfAbsentFunction(value);
+		Object result = this.cache.get(key, callable);
+		return (callable.called ? null : toValueWrapper(result));
+	}
+
+	@Override
+	public void evict(Object key) {
+		this.cache.invalidate(key);
+	}
+
+	@Override
+	public void clear() {
+		this.cache.invalidateAll();
+	}
+
+
+	private class PutIfAbsentFunction implements Function<Object, Object> {
+
+		private final Object value;
+
+		private boolean called;
+
+		public PutIfAbsentFunction(Object value) {
+			this.value = value;
+		}
+
+		@Override
+		public Object apply(Object key) {
+			this.called = true;
+			return toStoreValue(this.value);
+		}
+	}
+
+
+	private class LoadFunction implements Function<Object, Object> {
+
+		private final Callable<?> valueLoader;
+
+		public LoadFunction(Callable<?> valueLoader) {
+			this.valueLoader = valueLoader;
+		}
+
+		@Override
+		public Object apply(Object o) {
+			try {
+				return toStoreValue(valueLoader.call());
+			}
+			catch (Exception ex) {
+				throw new ValueRetrievalException(o, valueLoader, ex);
+			}
+		}
+	}
+
+}