问题在于您是
methodA直接从中访问的
methodB，因此这将阻止通过处理缓存机制的Java代理。此外，您没有添加
@EnableCaching注释，因此测试中实际上根本没有缓存。
以下测试表明，如果您正确地检查了Spring创建的代理，则嵌套缓存模式将按预期工作：
import static org.junit.Assert.*;import java.util.Arrays;import java.util.Random;import java.util.concurrent.atomic.AtomicInteger;import javax.annotation.Resource;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.cache.CacheManager;import org.springframework.cache.annotation.Cacheable;import org.springframework.cache.annotation.EnableCaching;import org.springframework.cache.concurrent.ConcurrentMapCache;import org.springframework.cache.support.SimpleCacheManager;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.test.annotation.DirtiesContext;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(classes = { SpringCacheTest.Config.class })@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_CLASS)public class SpringCacheTest { private final static String CACHE_NAME = "testCache"; private final static AtomicInteger methodInvocations = new AtomicInteger(0); public interface ICacheableService { String methodA(int length); String methodB(String name); } @Resource private ICacheableService cache; @Test public void testNestedCaching() { String name = "test"; cache.methodB(name); assertEquals(methodInvocations.get(), 2); cache.methodA(name.length()); // should only be 2 as methodA for this length was already invoked before assertEquals(methodInvocations.get(), 2); } @Configuration @EnableCaching public static class Config { @Bean public CacheManager getCacheManager() { SimpleCacheManager cacheManager = new SimpleCacheManager(); cacheManager.setCaches(Arrays.asList(new ConcurrentMapCache(CACHE_NAME))); return cacheManager; } @Bean public ICacheableService getMockedEntityService() { return new ICacheableService() { private final Random random = new Random(); @Autowired ApplicationContext context; @Override @Cacheable(value = CACHE_NAME, key = "#root.methodName.concat('_').concat(#p0)") public String methodA(int length) { methodInvocations.incrementAndGet(); System.out.println("Invoking methodA"); char[] chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) { sb.append(chars[random.nextInt(chars.length)]); } String result = sb.toString(); System.out.println("Returning " + result + " for length: " + length); return result; } @Override @Cacheable(value = CACHE_NAME, key = "#root.methodName.concat('_').concat(#p0)") public String methodB(String name) { methodInvocations.incrementAndGet(); System.out.println("Invoking methodB"); ICacheableService cache = context.getBean(ICacheableService.class); String rand = cache.methodA(name.length()); String result = name + "_" + rand; System.out.println("Returning " + result + " for name: " + name); return result; } }; } }}
