RedisEncoder.java — netty Source File

Source Code

/*
 * Copyright 2016 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.codec.redis;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.netty.buffer.ByteBufUtil;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.CodecException;
import io.netty.handler.codec.MessageToMessageEncoder;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.UnstableApi;

import java.util.List;

/**
 * Encodes {@link RedisMessage} into bytes following
 * <a href="https://redis.io/topics/protocol">RESP (REdis Serialization Protocol)</a>.
 */
@UnstableApi
public class RedisEncoder extends MessageToMessageEncoder<RedisMessage> {

    private final RedisMessagePool messagePool;

    /**
     * Creates a new instance with default {@code messagePool}.
     */
    public RedisEncoder() {
        this(FixedRedisMessagePool.INSTANCE);
    }

    /**
     * Creates a new instance.
     * @param messagePool the predefined message pool.
     */
    public RedisEncoder(RedisMessagePool messagePool) {
        super(RedisMessage.class);
        this.messagePool = ObjectUtil.checkNotNull(messagePool, "messagePool");
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, RedisMessage msg, List<Object> out) throws Exception {
        try {
            writeRedisMessage(ctx.alloc(), msg, out);
        } catch (CodecException e) {
            throw e;
        } catch (Exception e) {
// ... (149 more lines)