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Infinispan Resp Protocol Server

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package org.infinispan.server.resp.commands.string;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;

import org.infinispan.server.resp.Resp3Handler;
import org.infinispan.server.resp.RespCommand;
import org.infinispan.server.resp.RespRequestHandler;
import org.infinispan.server.resp.commands.Resp3Command;
import org.infinispan.server.resp.serialization.Resp3Response;

import io.netty.channel.ChannelHandlerContext;

/**
 * GET Resp Command
 *
 * Get the value of key. If the key does not exist the special value nil is returned.
 * An error is returned if the value stored at key is not a string, because GET only handles string values.
 *
 * @see Redis documentation
 * @since 14.0
 */
public class GET extends RespCommand implements Resp3Command {
   public GET() {
      super(2, 1, 1, 1);
   }

   @Override
   public CompletionStage perform(Resp3Handler handler,
                                                      ChannelHandlerContext ctx,
                                                      List arguments) {
      byte[] keyBytes = arguments.get(0);

      CompletableFuture async = handler.cache().getAsync(keyBytes);
      return handler.stageToReturn(async, ctx, Resp3Response.BULK_STRING_BYTES);
   }
}