com.emily.infrastructure.redis.repository.RedisDbKeyValueTemplate Maven / Gradle / Ivy
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package com.emily.infrastructure.redis.repository;
import org.springframework.data.keyvalue.core.KeyValueAdapter;
import org.springframework.data.keyvalue.core.KeyValueCallback;
import org.springframework.data.keyvalue.core.KeyValueTemplate;
import org.springframework.data.keyvalue.core.mapping.KeyValuePersistentProperty;
import org.springframework.data.mapping.PersistentPropertyAccessor;
import org.springframework.data.redis.core.PartialUpdate;
import org.springframework.data.redis.core.RedisCallback;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.convert.RedisConverter;
import org.springframework.data.redis.core.convert.RedisData;
import org.springframework.data.redis.core.mapping.RedisMappingContext;
import org.springframework.data.redis.core.mapping.RedisPersistentEntity;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
* @author : Emily
* @since : 2024/7/8 下午21:37
*/
public class RedisDbKeyValueTemplate extends KeyValueTemplate {
private final RedisDbKeyValueAdapter adapter;
/**
* Create new {@link RedisDbKeyValueTemplate}.
*
* @param adapter must not be {@literal null}.
* @param mappingContext must not be {@literal null}.
*/
public RedisDbKeyValueTemplate(RedisDbKeyValueAdapter adapter, RedisMappingContext mappingContext) {
super(adapter, mappingContext);
this.adapter = adapter;
}
/**
* Obtain the underlying redis specific {@link org.springframework.data.convert.EntityConverter}.
*
* @return never {@literal null}.
* @since 2.1
*/
public RedisConverter getConverter() {
return adapter.getConverter();
}
@Override
public RedisMappingContext getMappingContext() {
return (RedisMappingContext) super.getMappingContext();
}
/**
* Retrieve entities by resolving their {@literal id}s and converting them into required type.
* The callback provides either a single {@literal id} or an {@link Iterable} of {@literal id}s, used for retrieving
* the actual domain types and shortcuts manual retrieval and conversion of {@literal id}s via {@link RedisTemplate}.
*
*
*
* List<RedisSession> sessions = template.find(new RedisCallback<Set<byte[]>>() {
* public Set<byte[]< doInRedis(RedisConnection connection) throws DataAccessException {
* return connection
* .sMembers("spring:session:sessions:securityContext.authentication.principal.username:user"
* .getBytes());
* }
* }, RedisSession.class);
*
*
*
* @param callback provides the to retrieve entity ids. Must not be {@literal null}.
* @param type must not be {@literal null}.
* @return empty list if not elements found.
*/
public List find(RedisCallback callback, Class type) {
Assert.notNull(callback, "Callback must not be null");
return execute(new RedisDbKeyValueTemplate.RedisKeyValueCallback>() {
@Override
public List doInRedis(RedisDbKeyValueAdapter adapter) {
Object callbackResult = adapter.execute(callback);
if (callbackResult == null) {
return Collections.emptyList();
}
Iterable ids = ClassUtils.isAssignable(Iterable.class, callbackResult.getClass())
? (Iterable) callbackResult : Collections.singleton(callbackResult);
List result = new ArrayList<>();
for (Object id : ids) {
String idToUse = adapter.getConverter().getConversionService().canConvert(id.getClass(), String.class)
? adapter.getConverter().getConversionService().convert(id, String.class) : id.toString();
findById(idToUse, type).ifPresent(result::add);
}
return result;
}
});
}
@Override
public T insert(Object id, T objectToInsert) {
if (objectToInsert instanceof PartialUpdate) {
doPartialUpdate((PartialUpdate) objectToInsert);
return objectToInsert;
}
if (!(objectToInsert instanceof RedisData)) {
RedisConverter converter = adapter.getConverter();
RedisPersistentEntity entity = converter.getMappingContext()
.getRequiredPersistentEntity(objectToInsert.getClass());
KeyValuePersistentProperty idProperty = entity.getRequiredIdProperty();
PersistentPropertyAccessor propertyAccessor = entity.getPropertyAccessor(objectToInsert);
if (propertyAccessor.getProperty(idProperty) == null) {
propertyAccessor.setProperty(idProperty, id);
return super.insert(id, propertyAccessor.getBean());
}
}
return super.insert(id, objectToInsert);
}
@Override
public T update(T objectToUpdate) {
if (objectToUpdate instanceof PartialUpdate partialUpdate) {
doPartialUpdate(partialUpdate);
return objectToUpdate;
}
return super.update(objectToUpdate);
}
@Override
public T update(Object id, T objectToUpdate) {
return super.update(id, objectToUpdate);
}
protected void doPartialUpdate(final PartialUpdate update) {
execute(new RedisDbKeyValueTemplate.RedisKeyValueCallback() {
@Override
public Void doInRedis(RedisDbKeyValueAdapter adapter) {
adapter.update(update);
return null;
}
});
}
/**
* Redis specific {@link KeyValueCallback}.
*
* @param
* @author Christoph Strobl
* @since 1.7
*/
public static abstract class RedisKeyValueCallback implements KeyValueCallback {
@Override
public T doInKeyValue(KeyValueAdapter adapter) {
return doInRedis((RedisDbKeyValueAdapter) adapter);
}
public abstract T doInRedis(RedisDbKeyValueAdapter adapter);
}
}