Polishing

spring-context-support/src/main/java/org/springframework/cache/caffeine/CaffeineCacheManager.java

@@ -110,7 +110,7 @@ public class CaffeineCacheManager implements CacheManager {
 	 * Set the Caffeine to use for building each individual
 	 * {@link CaffeineCache} instance.
 	 * @see #createNativeCaffeineCache
-	 * @see com.github.benmanes.caffeine.cache.Caffeine#build()
+	 * @see Caffeine#build()
 	 */
 	public void setCaffeine(Caffeine<Object, Object> caffeine) {
 		Assert.notNull(caffeine, "Caffeine must not be null");
@@ -121,7 +121,7 @@ public class CaffeineCacheManager implements CacheManager {
 	 * Set the {@link CaffeineSpec} to use for building each individual
 	 * {@link CaffeineCache} instance.
 	 * @see #createNativeCaffeineCache
-	 * @see com.github.benmanes.caffeine.cache.Caffeine#from(CaffeineSpec)
+	 * @see Caffeine#from(CaffeineSpec)
 	 */
 	public void setCaffeineSpec(CaffeineSpec caffeineSpec) {
 		doSetCaffeine(Caffeine.from(caffeineSpec));
@@ -132,7 +132,7 @@ public class CaffeineCacheManager implements CacheManager {
 	 * individual {@link CaffeineCache} instance. The given value needs to
 	 * comply with Caffeine's {@link CaffeineSpec} (see its javadoc).
 	 * @see #createNativeCaffeineCache
-	 * @see com.github.benmanes.caffeine.cache.Caffeine#from(String)
+	 * @see Caffeine#from(String)
 	 */
 	public void setCacheSpecification(String cacheSpecification) {
 		doSetCaffeine(Caffeine.from(cacheSpecification));
@@ -149,7 +149,7 @@ public class CaffeineCacheManager implements CacheManager {
 	 * Set the Caffeine CacheLoader to use for building each individual
 	 * {@link CaffeineCache} instance, turning it into a LoadingCache.
 	 * @see #createNativeCaffeineCache
-	 * @see com.github.benmanes.caffeine.cache.Caffeine#build(CacheLoader)
+	 * @see Caffeine#build(CacheLoader)
 	 * @see com.github.benmanes.caffeine.cache.LoadingCache
 	 */
 	public void setCacheLoader(CacheLoader<Object, Object> cacheLoader) {

spring-context-support/src/test/java/org/springframework/cache/caffeine/CaffeineCacheManagerTests.java

@@ -38,19 +38,17 @@ public class CaffeineCacheManagerTests {
 	@Test
 	public void testDynamicMode() {
 		CacheManager cm = new CaffeineCacheManager();
+
 		Cache cache1 = cm.getCache("c1");
-		boolean condition2 = cache1 instanceof CaffeineCache;
+		assertThat(cache1).isInstanceOf(CaffeineCache.class);
-		assertThat(condition2).isTrue();
 		Cache cache1again = cm.getCache("c1");
 		assertThat(cache1).isSameAs(cache1again);
 		Cache cache2 = cm.getCache("c2");
-		boolean condition1 = cache2 instanceof CaffeineCache;
+		assertThat(cache2).isInstanceOf(CaffeineCache.class);
-		assertThat(condition1).isTrue();
 		Cache cache2again = cm.getCache("c2");
 		assertThat(cache2).isSameAs(cache2again);
 		Cache cache3 = cm.getCache("c3");
-		boolean condition = cache3 instanceof CaffeineCache;
+		assertThat(cache3).isInstanceOf(CaffeineCache.class);
-		assertThat(condition).isTrue();
 		Cache cache3again = cm.getCache("c3");
 		assertThat(cache3).isSameAs(cache3again);
 
@@ -62,19 +60,23 @@ public class CaffeineCacheManagerTests {
 		assertThat(cache1.get("key3").get()).isNull();
 		cache1.evict("key3");
 		assertThat(cache1.get("key3")).isNull();
+		assertThat(cache1.get("key3", () -> "value3")).isEqualTo("value3");
+		assertThat(cache1.get("key3", () -> "value3")).isEqualTo("value3");
+		cache1.evict("key3");
+		assertThat(cache1.get("key3", () -> (String) null)).isNull();
+		assertThat(cache1.get("key3", () -> (String) null)).isNull();
 	}
 
 	@Test
 	public void testStaticMode() {
 		CaffeineCacheManager cm = new CaffeineCacheManager("c1", "c2");
+
 		Cache cache1 = cm.getCache("c1");
-		boolean condition3 = cache1 instanceof CaffeineCache;
+		assertThat(cache1).isInstanceOf(CaffeineCache.class);
-		assertThat(condition3).isTrue();
 		Cache cache1again = cm.getCache("c1");
 		assertThat(cache1).isSameAs(cache1again);
 		Cache cache2 = cm.getCache("c2");
-		boolean condition2 = cache2 instanceof CaffeineCache;
+		assertThat(cache2).isInstanceOf(CaffeineCache.class);
-		assertThat(condition2).isTrue();
 		Cache cache2again = cm.getCache("c2");
 		assertThat(cache2).isSameAs(cache2again);
 		Cache cache3 = cm.getCache("c3");
@@ -91,13 +93,11 @@ public class CaffeineCacheManagerTests {
 
 		cm.setAllowNullValues(false);
 		Cache cache1x = cm.getCache("c1");
-		boolean condition1 = cache1x instanceof CaffeineCache;
+		assertThat(cache1x).isInstanceOf(CaffeineCache.class);
-		assertThat(condition1).isTrue();
+		assertThat(cache1x).isNotSameAs(cache1);
-		assertThat(cache1x != cache1).isTrue();
 		Cache cache2x = cm.getCache("c2");
-		boolean condition = cache2x instanceof CaffeineCache;
+		assertThat(cache2x).isInstanceOf(CaffeineCache.class);
-		assertThat(condition).isTrue();
+		assertThat(cache2x).isNotSameAs(cache2);
-		assertThat(cache2x != cache2).isTrue();
 		Cache cache3x = cm.getCache("c3");
 		assertThat(cache3x).isNull();
 
@@ -190,7 +190,7 @@ public class CaffeineCacheManagerTests {
 		assertThat(value.get()).isEqualTo("pong");
 
 		assertThatIllegalArgumentException().isThrownBy(() -> assertThat(cache1.get("foo")).isNull())
-			.withMessageContaining("I only know ping");
+				.withMessageContaining("I only know ping");
 	}
 
 	@Test

spring-context/src/main/java/org/springframework/cache/Cache.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -23,14 +23,20 @@ import org.springframework.lang.Nullable;
 /**
  * Interface that defines common cache operations.
  *
- * <b>Note:</b> Due to the generic use of caching, it is recommended that
+ * <p>Serves as an SPI for Spring's annotation-based caching model
- * implementations allow storage of {@code null} values (for example to
+ * ({@link org.springframework.cache.annotation.Cacheable} and co)
- * cache methods that return {@code null}).
+ * as well as an API for direct usage in applications.
+ *
+ * <p><b>Note:</b> Due to the generic use of caching, it is recommended
+ * that implementations allow storage of {@code null} values
+ * (for example to cache methods that return {@code null}).
  *
  * @author Costin Leau
  * @author Juergen Hoeller
  * @author Stephane Nicoll
  * @since 3.1
+ * @see CacheManager
+ * @see org.springframework.cache.annotation.Cacheable
  */
 public interface Cache {
 

spring-context/src/main/java/org/springframework/cache/interceptor/AbstractCacheInvoker.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -82,12 +82,12 @@ public abstract class AbstractCacheInvoker {
 	 * Execute {@link Cache#put(Object, Object)} on the specified {@link Cache}
 	 * and invoke the error handler if an exception occurs.
 	 */
-	protected void doPut(Cache cache, Object key, @Nullable Object result) {
+	protected void doPut(Cache cache, Object key, @Nullable Object value) {
 		try {
-			cache.put(key, result);
+			cache.put(key, value);
 		}
 		catch (RuntimeException ex) {
-			getErrorHandler().handleCachePutError(ex, cache, key, result);
+			getErrorHandler().handleCachePutError(ex, cache, key, value);
 		}
 	}
 

spring-context/src/main/java/org/springframework/cache/interceptor/CacheAspectSupport.java

@@ -397,11 +397,11 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 		processCacheEvicts(contexts.get(CacheEvictOperation.class), true,
 				CacheOperationExpressionEvaluator.NO_RESULT);
 
-		// Check if we have a cached item matching the conditions
+		// Check if we have a cached value matching the conditions
 		Cache.ValueWrapper cacheHit = findCachedItem(contexts.get(CacheableOperation.class));
 
-		// Collect puts from any @Cacheable miss, if no cached item is found
+		// Collect puts from any @Cacheable miss, if no cached value is found
-		List<CachePutRequest> cachePutRequests = new ArrayList<>();
+		List<CachePutRequest> cachePutRequests = new ArrayList<>(1);
 		if (cacheHit == null) {
 			collectPutRequests(contexts.get(CacheableOperation.class),
 					CacheOperationExpressionEvaluator.NO_RESULT, cachePutRequests);
@@ -468,7 +468,7 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 	private boolean hasCachePut(CacheOperationContexts contexts) {
 		// Evaluate the conditions *without* the result object because we don't have it yet...
 		Collection<CacheOperationContext> cachePutContexts = contexts.get(CachePutOperation.class);
-		Collection<CacheOperationContext> excluded = new ArrayList<>();
+		Collection<CacheOperationContext> excluded = new ArrayList<>(1);
 		for (CacheOperationContext context : cachePutContexts) {
 			try {
 				if (!context.isConditionPassing(CacheOperationExpressionEvaluator.RESULT_UNAVAILABLE)) {
@@ -521,9 +521,9 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 	}
 
 	/**
-	 * Find a cached item only for {@link CacheableOperation} that passes the condition.
+	 * Find a cached value only for {@link CacheableOperation} that passes the condition.
 	 * @param contexts the cacheable operations
-	 * @return a {@link Cache.ValueWrapper} holding the cached item,
+	 * @return a {@link Cache.ValueWrapper} holding the cached value,
 	 * or {@code null} if none is found
 	 */
 	@Nullable
@@ -548,9 +548,9 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 
 	/**
 	 * Collect the {@link CachePutRequest} for all {@link CacheOperation} using
-	 * the specified result item.
+	 * the specified result value.
 	 * @param contexts the contexts to handle
-	 * @param result the result item (never {@code null})
+	 * @param result the result value (never {@code null})
 	 * @param putRequests the collection to update
 	 */
 	private void collectPutRequests(Collection<CacheOperationContext> contexts,
@@ -722,7 +722,7 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 			this.args = extractArgs(metadata.method, args);
 			this.target = target;
 			this.caches = CacheAspectSupport.this.getCaches(this, metadata.cacheResolver);
-			this.cacheNames = createCacheNames(this.caches);
+			this.cacheNames = prepareCacheNames(this.caches);
 		}
 
 		@Override
@@ -810,8 +810,8 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 			return this.cacheNames;
 		}
 
-		private Collection<String> createCacheNames(Collection<? extends Cache> caches) {
+		private Collection<String> prepareCacheNames(Collection<? extends Cache> caches) {
-			Collection<String> names = new ArrayList<>();
+			Collection<String> names = new ArrayList<>(caches.size());
 			for (Cache cache : caches) {
 				names.add(cache.getName());
 			}

spring-context/src/main/java/org/springframework/cache/support/SimpleCacheManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -24,14 +24,16 @@ import org.springframework.cache.Cache;
 /**
  * Simple cache manager working against a given collection of caches.
  * Useful for testing or simple caching declarations.
- * <p>
+ *
- * When using this implementation directly, i.e. not via a regular
+ * <p>When using this implementation directly, i.e. not via a regular
  * bean registration, {@link #initializeCaches()} should be invoked
  * to initialize its internal state once the
  * {@linkplain #setCaches(Collection) caches have been provided}.
  *
  * @author Costin Leau
  * @since 3.1
+ * @see NoOpCache
+ * @see org.springframework.cache.concurrent.ConcurrentMapCache
  */
 public class SimpleCacheManager extends AbstractCacheManager {
 

spring-context/src/test/java/org/springframework/cache/CacheReproTests.java

@@ -118,6 +118,7 @@ class CacheReproTests {
 		assertThat(cacheResolver.getCache("foo").get("foo")).isNull();
 		Object result = bean.getSimple("foo");  // cache name = id
 		assertThat(cacheResolver.getCache("foo").get("foo").get()).isEqualTo(result);
+
 		context.close();
 	}
 
@@ -127,7 +128,7 @@ class CacheReproTests {
 		Spr13081Service bean = context.getBean(Spr13081Service.class);
 
 		assertThatIllegalStateException().isThrownBy(() -> bean.getSimple(null))
-			.withMessageContaining(MyCacheResolver.class.getName());
+				.withMessageContaining(MyCacheResolver.class.getName());
 		context.close();
 	}
 
@@ -146,6 +147,7 @@ class CacheReproTests {
 		TestBean tb2 = bean.findById("tb1").get();
 		assertThat(tb2).isNotSameAs(tb);
 		assertThat(cache.get("tb1").get()).isSameAs(tb2);
+
 		context.close();
 	}
 
@@ -177,6 +179,7 @@ class CacheReproTests {
 		bean.insertItem(tb);
 		assertThat(bean.findById("tb1").get()).isSameAs(tb);
 		assertThat(cache.get("tb1").get()).isSameAs(tb);
+
 		context.close();
 	}
 
@@ -190,6 +193,7 @@ class CacheReproTests {
 		bean.insertItem(tb);
 		assertThat(bean.findById("tb1").get()).isSameAs(tb);
 		assertThat(cache.get("tb1").get()).isSameAs(tb);
+
 		context.close();
 	}