spring-data-redis LettuceByteBufferPubSubListenerWrapper 源码
spring-data-redis LettuceByteBufferPubSubListenerWrapper 代码
文件路径：/src/main/java/org/springframework/data/redis/connection/lettuce/LettuceByteBufferPubSubListenerWrapper.java
/*
* Copyright 2021-2022 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.lettuce;
import io.lettuce.core.pubsub.RedisPubSubListener;
import java.nio.ByteBuffer;
import org.springframework.data.redis.util.ByteUtils;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Wrapper around {@link RedisPubSubListener} that converts {@link ByteBuffer} into {@code byte[]}.
*
* @author Mark Paluch
* @since 2.6
*/
class LettuceByteBufferPubSubListenerWrapper implements RedisPubSubListener<ByteBuffer, ByteBuffer> {
private final RedisPubSubListener<byte[], byte[]> delegate;
LettuceByteBufferPubSubListenerWrapper(RedisPubSubListener<byte[], byte[]> delegate) {
Assert.notNull(delegate, "RedisPubSubListener must not be null");
this.delegate = delegate;
}
public void message(ByteBuffer channel, ByteBuffer message) {
delegate.message(getBytes(channel), getBytes(message));
}
public void message(ByteBuffer pattern, ByteBuffer channel, ByteBuffer message) {
delegate.message(getBytes(channel), getBytes(message), getBytes(pattern));
}
public void subscribed(ByteBuffer channel, long count) {
delegate.subscribed(getBytes(channel), count);
}
public void psubscribed(ByteBuffer pattern, long count) {
delegate.psubscribed(getBytes(pattern), count);
}
public void unsubscribed(ByteBuffer channel, long count) {
delegate.unsubscribed(getBytes(channel), count);
}
public void punsubscribed(ByteBuffer pattern, long count) {
delegate.punsubscribed(getBytes(pattern), count);
}
/**
* Extract a byte array from {@link ByteBuffer} without consuming it.
*
* @param byteBuffer must not be {@literal null}.
* @return
*/
private static byte[] getBytes(@Nullable ByteBuffer byteBuffer) {
if (byteBuffer == null) {
return new byte[0];
}
return ByteUtils.getBytes(byteBuffer);
}
}
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