BAEL-6250: Example code for Get All Caffeine Cache Keys article (#13806)

spring-boot-modules/spring-caching/src/main/java/com/baeldung/allkeys/config/AllKeysConfig.java

@@ -0,0 +1,25 @@
+package com.baeldung.allkeys.config;
+
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.caffeine.CaffeineCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.baeldung.allkeys.service.SlowServiceWithCache;
+
+@Configuration
+@EnableCaching
+public class AllKeysConfig {
+
+    @Bean
+    SlowServiceWithCache slowServiceWithCache() {
+        return new SlowServiceWithCache();
+    }
+
+    @Bean
+    CacheManager cacheManager() {
+        return new CaffeineCacheManager();
+    }
+
+}

spring-boot-modules/spring-caching/src/main/java/com/baeldung/allkeys/service/SlowServiceWithCache.java

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+package com.baeldung.allkeys.service;
+
+import org.springframework.cache.annotation.CachePut;
+
+public class SlowServiceWithCache {
+
+    @CachePut(cacheNames = "slowServiceCache", key = "#name")
+    public String save(String name, String details) {
+        return details;
+    }
+}

spring-boot-modules/spring-caching/src/test/java/com/baeldung/caching/allkeys/boot/GetAllCacheKeysIntegrationTest.java

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+package com.baeldung.caching.allkeys.boot;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.caffeine.CaffeineCache;
+import org.springframework.cache.caffeine.CaffeineCacheManager;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.allkeys.config.AllKeysConfig;
+import com.baeldung.allkeys.service.SlowServiceWithCache;
+import com.github.benmanes.caffeine.cache.Cache;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+@ContextConfiguration(classes = AllKeysConfig.class)
+public class GetAllCacheKeysIntegrationTest {
+
+    @Autowired
+    private SlowServiceWithCache slowServiceWithCache;
+    @Autowired
+    private CacheManager cacheManager;
+
+    @Test
+    public void givenCaffeineCacheCachingSlowCalls_whenCacheManagerProperlyCasted_thenAllKeysAreAccessible() {
+        slowServiceWithCache.save("first", "some-value-first");
+        slowServiceWithCache.save("second", "other-value-second");
+
+        Cache<Object, Object> caffeine = getNativeCaffeineCacheForSlowService();
+
+        assertThat(caffeine.asMap().keySet()).containsOnly("first", "second");
+    }
+
+    private Cache<Object, Object> getNativeCaffeineCacheForSlowService() {
+        CaffeineCacheManager caffeineCacheManager = (CaffeineCacheManager) cacheManager;
+        CaffeineCache cache = (CaffeineCache) caffeineCacheManager.getCache("slowServiceCache");
+        return cache.getNativeCache();
+    }
+}