springside#8 hzl7652提交的GuavaCacheDemo,但rebase出错了,再手工提交一遍。

kaven-G · Mar 27, 2012 · cb23f45 · cb23f45
1 parent 1cb90c9
commit cb23f45
Showing 1 changed file with 60 additions and 0 deletions.
diff --git a/...s/showcase/src/main/java/org/springside/examples/showcase/cache/guava/GuavaCacheDemo.java b/...s/showcase/src/main/java/org/springside/examples/showcase/cache/guava/GuavaCacheDemo.java
@@ -0,0 +1,60 @@
+package org.springside.examples.showcase.cache.guava;
+
+import static org.junit.Assert.*;
+
+import java.util.concurrent.TimeUnit;
+
+import javax.annotation.Resource;
+
+import org.junit.Test;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.transaction.TransactionConfiguration;
+import org.springside.examples.showcase.common.entity.User;
+import org.springside.examples.showcase.common.service.AccountManager;
+import org.springside.modules.test.data.H2Fixtures;
+import org.springside.modules.test.spring.SpringTxTestCase;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+
+/**
+ * 本地缓存演示，使用GuavaCache.
+ * 可以通过log4jdbc查看sql情况.
+ * 
+ * @author hzl7652
+ */
+@ContextConfiguration(locations = { "/applicationContext.xml" })
+@TransactionConfiguration(transactionManager = "defaultTransactionManager")
+public class GuavaCacheDemo extends SpringTxTestCase {
+
+	@Resource
+	private AccountManager accountManager;
+
+	@Test
+	public void test1() throws Exception {
+		H2Fixtures.reloadAllTable(dataSource, "/data/sample-data.xml");
+		LoadingCache<Long, User> cache = CacheBuilder.newBuilder().maximumSize(100)//设置缓存个数
+				.expireAfterAccess(3, TimeUnit.SECONDS)//缓存过期时间为8秒
+				.build(new CacheLoader<Long, User>() {
+
+					@Override
+					public User load(Long key) throws Exception {
+						return accountManager.getUser(key);
+					}
+
+				});
+
+		User user = cache.get(1L);
+		assertEquals("admin", user.getLoginName());//第一次加载会查数据库
+
+		User user2 = cache.get(1L);//第二次加载时直接从缓存里取
+		assertEquals("admin", user2.getLoginName());
+
+		Thread.sleep(10000);
+		user = cache.get(1L);
+		;//第三次加载时，因为缓存已经过期所以会查数据库
+		System.out.println(user);
+		assertEquals("admin", user.getLoginName());
+	}
+}