spring-data-redis StreamSerialization 源码
spring-data-redis StreamSerialization 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/stream/StreamSerialization.java
/*
* Copyright 2018-2022 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.data.redis.connection.stream;
import java.nio.ByteBuffer;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.util.ByteUtils;
import org.springframework.lang.Nullable;
/**
* Utility methods for stream serialization.
*
* @author Mark Paluch
* @since 2.2
*/
class StreamSerialization {
/**
* Serialize the {@code value} using the optional {@link RedisSerializer}. If no conversion is possible, {@code value}
* is assumed to be a byte array.
*
* @param serializer the serializer. Can be {@literal null}.
* @param value the value to serialize.
* @return the serialized (binary) representation of {@code value}.
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
static byte[] serialize(@Nullable RedisSerializer<?> serializer, Object value) {
return canSerialize(serializer, value) ? ((RedisSerializer) serializer).serialize(value) : (byte[]) value;
}
/**
* Deserialize the {@code value using the optional {@link RedisSerializer}. If no conversion is possible, return
* {@code value}. @param serializer @param value @param <T> @return
*/
static <T> T deserialize(@Nullable RedisSerializer<? extends T> serializer, ByteBuffer value) {
return deserialize(serializer, ByteUtils.getBytes(value));
}
/**
* Deserialize the {@code value using the optional {@link RedisSerializer}. If no conversion is possible, return
* {@code value}. @param serializer @param value @param <T> @return
*/
static <T> T deserialize(@Nullable RedisSerializer<? extends T> serializer, byte[] value) {
return serializer != null ? serializer.deserialize(value) : (T) value;
}
/**
* Returns whether the given {@link RedisSerializer} is capable of serializing the {@code value} to {@literal byte[]}.
*
* @param serializer the serializer. Can be {@literal null}.
* @param value the value to serialize.
* @return {@literal true} if the given {@link RedisSerializer} is capable of serializing the {@code value} to
* {@literal byte[]}.
*/
private static boolean canSerialize(@Nullable RedisSerializer<?> serializer, @Nullable Object value) {
return serializer != null && (value == null || serializer.canSerialize(value.getClass()));
}
}
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