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How to elegantly implement dictionary translation in Java
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2023-05-12 17:31:061314browse
What is serialization
In Java, serialization is the process of converting objects into byte streams that can be saved to files or transmitted over the network. Deserialization is the process of converting a byte stream into a raw object. Through serialization and deserialization, we can pass objects between different applications and also save objects to files for later use.
Use serialization to realize translation of dictionary values
In Java, we can use the serialization mechanism to realize the correspondence between encoding and its corresponding meaning. The specific steps are as follows:
4. Because serialization requires each object to perform a sequence operation, if a collection is returned, Many serialization operations will be performed. At this time, dictionaries of the same type need to be cached. I used guava's LoadingCache for local caching (someone may say here that if the meaning of the dictionary value is modified at this time, Wouldn't your cache lead to incorrect data? First of all, the dictionary function is usually added, deleted, and modified on the management side, and once the dictionary is set, it will not be easily modified. If you want to force a fight, you win).
public class DictionaryConstants {
/**
* 字典翻译文本后缀
*/
public static final String DICT_TEXT_SUFFIX = "_dictText";
public static final LoadingCache> DICTIONARY_CACHE = CacheBuilder.newBuilder()
.maximumSize(1000)
.expireAfterWrite(30, TimeUnit.SECONDS)
.expireAfterAccess(10, TimeUnit.SECONDS)
.build(new CacheLoader>() {
@Override
public Map load(String key) {
Map map = new HashMap<>();
map.put("nullValue", "nullValue");
return map;
}
});
}
Here is an additional little knowledge:
expireAfterWrite and expireAfterAccess are both cache expiration strategies in the Google Guava cache library.
expireAfterWrite indicates that the cache item expires after the specified time, regardless of whether the cache item has been accessed. For example, if we set the cache item's expireAfterWrite to 10 minutes, the cache item expires 10 minutes after it is added to the cache, regardless of whether it has been accessed.
These two expiration strategies can be used alone or in combination to achieve a more flexible caching strategy. For example, we can set the cache item's expireAfterWrite to 10 minutes and also set the expireAfterAccess to 5 minutes, so that the cache item will expire after 10 minutes, or expire when it has not been accessed in the last 5 minutes, whichever comes first .
Using expireAfterWrite and expireAfterAccess can avoid the data expiration time in the cache from being too long or too short, thereby improving the efficiency and reliability of the cache.
5. Compared with using the aop aspect method, using the serialization method can better translate the dictionary (because the aop method is difficult to process the attributes of the object) , For example:
public class Company {
private List staffs;
}
public class Staff {
private Integer age;
private String name;
@Dic(dic = "position")
private String position;
}
In this scenario, if the Company collection is returned, it will be difficult to achieve the same effect (development difficulty and development cost) as the serialization method using the aop aspect method.
Through the above steps, we can use the serialization mechanism in Java to elegantly realize the correspondence between dictionary encoding and its corresponding meaning, thereby simplifying the management and maintenance of encoded data.
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