英文:
Spring share @Cachable and @CachePut key
问题
我正在尝试在我的项目中集成Spring缓存。我已经设置了一个Redis缓存管理器，它确实起作用。然而，这是我的场景：我有一个Setting实体。我想要创建一个findAll方法，可以返回所有设置，还有一个setSetting方法，允许设置特定的设置。
这是我为getSettings和setSetting定义的代码：
@Cacheable(value = "setting")
public List<Setting> getSettings() {
return repository.findAll();
}
@CachePut("setting")
public Optional<Setting> setSetting(String key, Object value) {
var setting = this.repository.findByIdentifier(key);
if (setting.isEmpty()) {
return Optional.empty();
}
try {
setting.get().setValue(mapper.writeValueAsString(value));
} catch (JsonProcessingException e) {
LOG.error("Could not serialize the value: {}", value);
return Optional.empty();
}
this.repository.save(setting.get());
return setting;
}
当我调用getSettings时，在我的Redis中会得到一个setting::SimpleKey []键（这是我的预期行为）。然而，当我调用setSetting时，由于有额外的参数，导致不是覆盖setting::SimpleKey []键，而是在Redis中得到另一个键："setting::SimpleKey [name, foobar]"（其中name和foobar是我传递给setSetting的参数）。
我理解这是keyGenerator的工作原理，但它似乎相当出乎意料，我不太理解如何设置我在findAll中使用的原始键。我是否必须制作一个自定义的键生成器？
我将非常感谢任何帮助！
英文:
I'm trying to integrate Spring cache within my project. I've set up a Redis cache manager and it indeed works. However, this is my scenario: I have a Setting entity. I want to make a findAll method that can return all of the settings and a setSetting which allows to set a specific setting.
This is the code I've defined for getSettings and setSetting:
@Cacheable(value = "setting")
public List<Setting> getSettings() {
return repository.findAll();
}
@CachePut("setting")
public Optional<Setting> setSetting(String key, Object value) {
var setting = this.repository.findByIdentifier(key);
if (setting.isEmpty()) {
return Optional.empty();
}
try {
setting.get().setValue(mapper.writeValueAsString(value));
} catch (JsonProcessingException e) {
LOG.error("Could not serialize the value: {}", value);
return Optional.empty();
}
this.repository.save(setting.get());
return setting;
}
When I call to getSettings I get a setting::SimpleKey [] key in my Redis (that's my expected behaviour). However, when I call to setSetting, because of the extra argument, instead of overrding the setting::SimpleKey [] key, I end up with another key in Redis: "setting::SimpleKey [name, foobar]" (where name and foobar are the arguments I've sent to setSetting`).
I understand that it's how kecusyGenerator works, but it seems quite unexpected and I quite don't understand how to set the original key I've used in findAll. Do I have to make a custom key generator?
I'll appriciate any help!
答案1
得分: 2
为了使 setSetting 能够覆盖从 getSettings 返回的缓存值，两个方法都应该返回 List<Setting>。在每次更新设置之前，确实需要清除现有的缓存值，例如：
@Cacheable(value = "setting")
public List<Setting> getSettings() {
return repository.findAll();
}
@CacheEvict(value = "setting", allEntries = true, beforeInvocation = true)
@Cacheable(value = "setting", key = "T(org.springframework.cache.interceptor.SimpleKey).EMPTY")
public List<Setting> setSetting(String key, Object value) {
// 1. 更新设置的值（就像你的代码中已经完成的那样）并保存更改
...
this.repository.save(setting.get());
// 2. 返回设置的列表
return repository.findAll();
}
英文:
In order for setSetting to override the cached value returned from getSettings both methods should return the List<Setting>. You do need to evict the existing cached values before each update of setting e.g.
@Cacheable(value = "setting")
public List<Setting> getSettings() {
return repository.findAll();
}
@CacheEvict(value = "setting", allEntries = true, beforeInvocation = true)
@Cacheable(value = "setting", key = "T(org.springframework.cache.interceptor.SimpleKey).EMPTY")
public List<Setting> setSetting(String key, Object value) {
// 1. update the setting value (as already done in your code) and save changes
...
this.repository.save(setting.get());
// 2. Return the list of settings
return repository.findAll();
}
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