49 lines
1.9 KiB
Markdown
49 lines
1.9 KiB
Markdown
# 方法缓存
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  @Cached注解在Service的方法上，实现对方法结果进行缓存。
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     1、返回类型不能是```void```/```CompletableFuture<Void>```<br>
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     2、返回类型必须是可json序列化的 <br>
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     3、修饰必须是```protected```/```public``` <br>
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     4、修饰不能是```final```/```static``` <br>
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  本地缓存和远程缓存可同时设置，```expire```设置为0，表示永不过期。
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  将结果进行本地缓存30秒且远程缓存60秒
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```java
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@Cached(key = "name", localExpire = "30", remoteExpire = "60")
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public String getName() {
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return "haha";
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}
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```
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  以参数code为key将结果进行本地缓存(时长由环境变量```env.cache.expire```配置，没配置采用默认值30秒)
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```java
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@Cached(key = "#{code}", localExpire = "${env.cache.expire:30}")
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public CompletableFuture<String> getNameAsync(String code) {
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return redis.getStringAsync(code);
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}
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```
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  以参数code+map.id为key将结果进行远程缓存60毫秒
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```java
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@Resource
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private CacheManager cacheManager;
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//实时修改远程缓存的key值
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public void updateName(String code, Map<String, Long> map) {
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cacheManager.remoteSetString(code, code + "_" + map.get("id"), Duration.ofMillis(60));
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}
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@Cached(key = "#{code}_#{map.id}", remoteExpire = "60", timeUnit = TimeUnit.MILLISECONDS)
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public String getName(String code, Map<String, Long> map) {
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return code + "-" + map;
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}
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```
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# 缓存配置
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```xml
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<!--
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全局Serivce的缓存设置，没配置该节点将自动创建一个。
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enabled： 是否开启缓存功能。默认: true
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source: 远程CacheSource的资源名
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-->
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<cache enabled="true" source="xxx"/>
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``` |