add cache and test for that

Signed-off-by: 0samsung0 <78357262+0samsung0@users.noreply.github.com>

src/main/java/org/springframework/samples/petclinic/cache/CacheConfig.java

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+package org.springframework.samples.petclinic.cache;
+
+import org.springframework.cache.CacheManager;
+import org.springframework.cache.annotation.EnableCaching;
+import org.springframework.cache.concurrent.ConcurrentMapCacheManager;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableCaching
+public class CacheConfig {
+    
+    @Bean
+    public CacheManager cacheManager() {
+        ConcurrentMapCacheManager cacheManager = new ConcurrentMapCacheManager();
+        cacheManager.setCacheNames(java.util.Arrays.asList("dataCache"));
+        return cacheManager;
+    }
+} 

src/main/java/org/springframework/samples/petclinic/cache/CacheableService.java

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+package org.springframework.samples.petclinic.cache;
+
+import org.springframework.cache.annotation.Cacheable;
+import org.springframework.stereotype.Service;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+
+@Service
+public class CacheableService {
+    
+    private final Map<String, String> dataStore = new HashMap<>();
+    
+    public CacheableService() {
+        // Инициализация тестовых данных
+        dataStore.put("key1", "value1");
+        dataStore.put("key2", "value2");
+        dataStore.put("key3", "value3");
+    }
+    
+    @Cacheable(value = "dataCache", key = "#key")
+    public String getData(String key) {
+        // Имитация задержки при получении данных
+        try {
+            TimeUnit.MILLISECONDS.sleep(100);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+        return dataStore.get(key);
+    }
+    
+    public void updateData(String key, String value) {
+        dataStore.put(key, value);
+    }
+} 

src/test/java/org/springframework/samples/petclinic/cache/CacheableServiceTest.java

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+package org.springframework.samples.petclinic.cache;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.cache.CacheManager;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+public class CacheableServiceTest {
+
+    @Autowired
+    private CacheableService cacheableService;
+    
+    @Autowired
+    private CacheManager cacheManager;
+
+    @Test
+    public void testCacheHit() {
+        // Первый вызов - кэш промах
+        long startTime1 = System.currentTimeMillis();
+        String result1 = cacheableService.getData("key1");
+        long duration1 = System.currentTimeMillis() - startTime1;
+        
+        // Второй вызов - должен быть кэш хит
+        long startTime2 = System.currentTimeMillis();
+        String result2 = cacheableService.getData("key1");
+        long duration2 = System.currentTimeMillis() - startTime2;
+        
+        // Проверяем результаты
+        assertEquals("value1", result1);
+        assertEquals("value1", result2);
+        
+        // Второй вызов должен быть быстрее из-за кэширования
+        assertTrue(duration2 < duration1);
+    }
+    
+    @Test
+    public void testCacheMiss() {
+        // Проверяем несуществующий ключ
+        String result = cacheableService.getData("nonExistentKey");
+        assertNull(result);
+    }
+    
+    @Test
+    public void testCacheUpdate() {
+        // Обновляем значение
+        cacheableService.updateData("key1", "newValue");
+        
+        // Получаем обновленное значение
+        String result = cacheableService.getData("key1");
+        assertEquals("newValue", result);
+    }
+}