/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *     http://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.apache.nifi.distributed.cache.server.codec;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import org.apache.nifi.distributed.cache.protocol.ProtocolHandshake;
import org.apache.nifi.distributed.cache.server.protocol.CacheVersionResponse;

/**
 * Message Encoder for Cache Version Responses
 */
@ChannelHandler.Sharable
public class CacheVersionResponseEncoder extends MessageToByteEncoder<CacheVersionResponse> {
    @Override
    protected void encode(final ChannelHandlerContext channelHandlerContext, final CacheVersionResponse cacheVersionResponse, final ByteBuf byteBuf) {
        final int statusCode = cacheVersionResponse.getStatusCode();
        byteBuf.writeByte(statusCode);

        if (ProtocolHandshake.DIFFERENT_RESOURCE_VERSION == statusCode) {
            final int version = cacheVersionResponse.getVersion();
            byteBuf.writeInt(version);
        }
    }
}
