昨天写了spring caching简单入门
今天把省下俩注解也说了
一共是
@Cacheable加缓存(缓存获取不到就调用方法获取结果再放入缓存)
@CachePut更新缓存
@CacheEvict删缓存
我们在Repository实现类加上这几个缓存注解
package com.ruben.simplecache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.CachePut;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Component;
@Component
public class SimpleBookRepository implements BookRepository {
private static final Logger log = LoggerFactory.getLogger(SimpleBookRepository.class);
@Override
@Cacheable("books")
public Book getByIsbn(String isbn) {
simulateSlowService();
log.warn("getByIsbn called {}", isbn);
return new Book(isbn, "Some book");
}
@Override
@CacheEvict("books")
public Book removeByIsbn(String isbn) {
log.warn("removeByIsbn called {}", isbn);
simulateSlowService();
return new Book(isbn, "Some book");
}
@Override
@CachePut("books")
public Book updateByIsbn(Book book) {
log.warn("updateByIsbn called {}", book);
simulateSlowService();
return book;
}
// Don't do this at home
private void simulateSlowService() {
try {
long time = 3000L;
Thread.sleep(time);
} catch (InterruptedException e) {
throw new IllegalStateException(e);
}
}
}在AppRunner调用试试
package com.ruben.simplecache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;
@Component
public class AppRunner implements CommandLineRunner {
private static final Logger logger = LoggerFactory.getLogger(AppRunner.class);
private final BookRepository bookRepository;
public AppRunner(BookRepository bookRepository) {
this.bookRepository = bookRepository;
}
@Override
public void run(String... args) throws Exception {
logger.info(".... Fetching books");
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info("isbn-4567 -->" bookRepository.getByIsbn("isbn-4567"));
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info("isbn-4567 -->" bookRepository.getByIsbn("isbn-4567"));
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info(".... Updating books");
logger.info("isbn-1234 -->" bookRepository.updateByIsbn(new Book("isbn-1234", "Some book")));
logger.info("isbn-4567 -->" bookRepository.updateByIsbn(new Book("isbn-4567", "Some book")));
logger.info(".... Fetching books");
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info("isbn-4567 -->" bookRepository.getByIsbn("isbn-4567"));
logger.info("... Removing Books");
logger.info("isbn-1234 -->" bookRepository.removeByIsbn("isbn-1234"));
logger.info("isbn-4567 -->" bookRepository.removeByIsbn("isbn-4567"));
logger.info(".... Fetching books");
logger.info("isbn-1234 -->" bookRepository.getByIsbn("isbn-1234"));
logger.info("isbn-4567 -->" bookRepository.getByIsbn("isbn-4567"));
}
}可以看到执行结果：
代码语言：javascript复制2023-01-25T15:38:29.004 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : .... Fetching books
2023-01-25T15:38:32.008 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : getByIsbn called isbn-1234
2023-01-25T15:38:32.009 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:35.015 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : getByIsbn called isbn-4567
2023-01-25T15:38:35.015 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:35.016 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:35.016 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:35.016 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:35.016 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:35.016 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : .... Updating books
2023-01-25T15:38:35.016 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : updateByIsbn called Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:38.026 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:38.026 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : updateByIsbn called Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:41.028 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:41.028 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : .... Fetching books
2023-01-25T15:38:41.028 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:41.028 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:41.028 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : ... Removing Books
2023-01-25T15:38:41.028 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : removeByIsbn called isbn-1234
2023-01-25T15:38:44.029 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:44.030 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : removeByIsbn called isbn-4567
2023-01-25T15:38:47.030 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
2023-01-25T15:38:47.030 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : .... Fetching books
2023-01-25T15:38:50.044 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : getByIsbn called isbn-1234
2023-01-25T15:38:50.044 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-1234 -->Book{isbn='isbn-1234', title='Some book'}
2023-01-25T15:38:53.045 08:00 WARN 31260 --- [ main] c.r.simplecache.SimpleBookRepository : getByIsbn called isbn-4567
2023-01-25T15:38:53.045 08:00 INFO 31260 --- [ main] com.ruben.simplecache.AppRunner : isbn-4567 -->Book{isbn='isbn-4567', title='Some book'}
