多种处理方式:
- 就像@Louis Wasserman所说的,有这样的东西:
import java.time.Instant;
import java.util.Objects;
public class CacheKey {
private Instant startDate;
private Instant endDate;
public CacheKey() {
}
public CacheKey(Instant startDate,Instant endDate) {
this.startDate = startDate;
this.endDate = endDate;
}
public Instant getStartDate() {
return startDate;
}
public void setStartDate(Instant startDate) {
this.startDate = startDate;
}
public Instant getEndDate() {
return endDate;
}
public void setEndDate(Instant endDate) {
this.endDate = endDate;
}
@Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
CacheKey cacheKey = (CacheKey) o;
return Objects.equals(startDate,cacheKey.startDate) &&
Objects.equals(endDate,cacheKey.endDate);
}
@Override
public int hashCode() {
return Objects.hash(startDate,endDate);
}
}
并在您的方法 checkCacheForData 中使用:
@Service
public class SomeServiceImpl implements SomeService {
private Cache<CacheKey,List<SomeVO>> someCache;
public RecentHighestSlotWinsServiceImpl() {
someCache= Caffeine.newBuilder().maximumSize(100).expireAfterWrite(1,TimeUnit.DAYS).build();
}
@Override
public List<SomeVO> checkCacheForData(Instant startDate,Instant endDate) {
List<SomeVO> someList= someCache.getIfPresent(new CacheKey(startDate,endDate));
if (someList!= null) {
return someList;
} else {
log.info("Loading from DB ");
List<SomeVO> templateResult= getData(startDate,endDate);
if (templateResult.isSuccessAndNotNull()) {
someCache.put(new CacheKey(startDate,endDate),Objects.requireNonNull(templateResult.getData()));
}
return templateResult;
}
}
- 您可以将开始日期和结束日期的字符串表示形式并用作为缓存键,而不必使用单独的对象。
@Service
public class SomeServiceImpl implements SomeService {
private Cache<String,Instant endDate) {
String cacheKey = startDate.toString() + endDate.toString();
List<SomeVO> someList= someCache.getIfPresent(cacheKey);
if (someList!= null) {
return someList;
} else {
log.info("Loading from DB ");
List<SomeVO> templateResult= getData(startDate,endDate);
if (templateResult.isSuccessAndNotNull()) {
someCache.put(cacheKey,Objects.requireNonNull(templateResult.getData()));
}
return templateResult;
}
}
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