强大的Spring缓存技术（中）

正文

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@CacheEvict(value="accountCache",allEntries=true)

public void reload() {

}

private void updateDB(Account account) {

logger.info("real update db...{}", account.getName());

}

private Optional getFromDB(String accountName) {

logger.info("real querying db... {}", accountName);

//Todo query data from database

return Optional.fromNullable(new Account(accountName));

}

}

我们的测试代码如下：

import com.rollenholt.spring.cache.example1.Account;

import org.junit.Before;

import org.junit.Test;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class AccountService3Test {

private AccountService3 accountService3;

private final Logger logger = LoggerFactory.getLogger(AccountService3Test.class);

@Before

public void setUp() throws Exception {

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("applicationContext2.xml");

accountService3 = context.getBean("accountService3", AccountService3.class);

}

@Test

public void testGetAccountByName() throws Exception {

logger.info("first query.....");

accountService3.getAccountByName("accountName");

logger.info("second query....");

accountService3.getAccountByName("accountName");

}

@Test

public void testUpdateAccount() throws Exception {

Account account1 = accountService3.getAccountByName("accountName1");

logger.info(account1.toString());

Account account2 = accountService3.getAccountByName("accountName2");

logger.info(account2.toString());

account2.setId(121212);

accountService3.updateAccount(account2);

// account1会走缓存

account1 = accountService3.getAccountByName("accountName1");

logger.info(account1.toString());

// account2会查询db

account2 = accountService3.getAccountByName("accountName2");

logger.info(account2.toString());

}

@Test

public void testReload() throws Exception {

accountService3.reload();

// 这2行查询数据库

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