FASTプロトコル解析（3）テンプレートの完成と解析効率の問題

モバイル 2023-08-09 04:13:21 訪問数: null

ナンセンス

前章では2種類の解析コードを紹介しましたが（手順は基本的に同じです）、今回はサンプルのデータをまとめて公開し、解析の効率についてお話します。

もう 1 つ避けなければならない点があります。そこで指定されたデータ ドキュメントとテンプレート ドキュメントは、フィールドの解析時にエラーを引き起こします。たとえば、プロトコル ドキュメントで説明されているように、FAST テンプレートは uInt64 フィールドとして定義されています。符号なし 64 ビット整数、つまり 0 から 2 の 64 乗までの範囲の正の整数です。私の理解によれば、これは Java の Long 型ですが、実際には getLong() メソッドを呼び出して値を取得しますが設定されている場合、プロトコルの型が Java で定義されている型と異なる (または私の理解が間違っている可能性があります) というエラーが報告される可能性が高くなります。

それがこのタイプの理由です。私は怠け者なので、すべて getString() メソッドを使用します。つまり、すべての値が文字列の形式で取得されます。正しい値をフェッチするほうが効率的であるのは当然です。

遊ぶ

(1) テンプレート（template.xml）

<?xml version="1.0" encoding="utf-8"?>
<templates xmlns="http://www.FIXprotocal.org/ns/FAST/td/1.1" templateNs="http://www.sse.com.cn/ns/templates/NGTS" ns="http://www.sse.com.cn/ns/STEP1.0.0">
  <!--Snapshot-->
  <template id="4001" name="MDSnapshotFullRefresh_4001">
    <typeRef name="MDSnapshotFullRefresh" />
    <string id="1500" name="MDStreamID">
      <copy />
    </string>
    <string id="48" name="SecurityID">
      <tail />
    </string>
    <byteVector id="55" name="Symbol" presence="optional">
      <default />
    </byteVector>
    <uInt64 id="8503" name="NumTrades" presence="optional">
      <delta />
    </uInt64>
    <uInt64 id="1020" name="TradeVolume" presence="optional">
      <delta />
    </uInt64>
    <decimal id="8504" name="TotalValueTraded" presence="optional">
      <delta />
    </decimal>
    <decimal id="140" name="PrevClosePx" presence="optional">
      <delta />
    </decimal>
    <decimal id="734" name="PrevSetPx" presence="optional">
      <delta />
    </decimal>
    <uInt64 id="8506" name="TotalLongPosition" presence="optional">
      <delta />
    </uInt64>
    <sequence name="MDFullGrp">
      <length id="268" name="NoMDEntries">
        <copy />
      </length>
      <string id="269" name="MDEntryType">
      </string>
      <decimal id="270" name="MDEntryPx" presence="optional">
        <delta />
      </decimal>
      <uInt64 id="271" name="MDEntrySize" presence="optional">
        <delta />
      </uInt64>
      <string id="273" name="MDEntryTime" presence="optional">
      	<tail />
      </string>
      <uInt32 id="290" name="MDEntryPositionNo" presence="optional">
      </uInt32>
    </sequence>
    <string id="8538" name="TradingPhaseCode" presence="optional">
      <copy />
    </string>
  </template>
    
</templates>

(2) テンプレートに対応するオブジェクト(MDSnapshotFullRefreshEntity、MDFullGrpEntity)

@Setter
@Getter
public class MDSnapshotFullRefreshEntity {
   
    private String MDStreamID;
   
    private String SecurityID;
    
    private String Symbol;
   
    private String NumTrades;
    
    private String TradeVolume;
    
    private String TotalValueTraded;
    
    private String PrevClosePx;
    
    private String PrevSetPx;
    
    private String TotalLongPosition;

    private List<MDFullGrpEntity> MDFullGrp;

}
@Setter
@Getter
public class MDFullGrpEntity {
    
    private String NoMDEntries;

    private String MDEntryType;

    private String MDEntryPx;

    private String MDEntrySize;
    
    private String MDEntryTime;
    
    private String MDEntryPositionNo;
    
    private String TradingPhaseCode;
}

(3) 解析ツールクラス（FastDecoderUtils）

以下に、解析されたコード呼び出しメソッドを 2 つ示します。これらは似ていますが、効率には若干の違いがあります。

@Slf4j
public class FastDecoderUtils{

    private static Context contextDecoder2;
    private static FastDecoder fastDecoder;

    private static XMLMessageTemplateLoader templateLoader;
    /**
     * 确保是FAST协议包，这里不会做协议校验，解析失败会抛出异常
     *
     * @param buff
     * @return
     */
    public static List<MDSnapshotFullRefreshEntity> decoder1(byte[] buff) throws Exception {
        if (buff == null) {
            return null;
        }

        List<MDSnapshotFullRefreshEntity> list = new ArrayList<>();
        if (templateLoader == null) {
            //从文件中导入模板，自己注意一下路径即可
            ClassPathResource classPathResource = new ClassPathResource("template/template.xml");
            InputStream inputStream1 = classPathResource.getStream();
            templateLoader = new XMLMessageTemplateLoader();
            templateLoader.setLoadTemplateIdFromAuxId(true);
            //载入模板
            templateLoader.load(inputStream1);
        }

        //载入数据源
        MessageInputStream mis = new MessageInputStream(new ByteArrayInputStream(buff));
        //注册模板
        mis.setTemplateRegistry(templateLoader.getTemplateRegistry());

        Message msg111 = null;

        //循环解析，直到解析完
        while ((msg111 = mis.readMessage()) != null) {
            MDSnapshotFullRefreshEntity refreshEntity = new MDSnapshotFullRefreshEntity();

            refreshEntity.setMDStreamID(msg111.getString("MDStreamID"));
            refreshEntity.setSecurityID(msg111.getString("SecurityID"));
            refreshEntity.setSymbol(new String(msg111.getBytes("Symbol"), "GBK"));
            refreshEntity.setNumTrades(msg111.getString("NumTrades"));
            refreshEntity.setTradeVolume(msg111.getString("TradeVolume"));
            refreshEntity.setTotalValueTraded(msg111.getString("TotalValueTraded"));
            refreshEntity.setPrevClosePx(msg111.getString("PrevClosePx"));
            refreshEntity.setPrevSetPx(msg111.getString("PrevSetPx"));
            refreshEntity.setTotalLongPosition(msg111.getString("TotalLongPosition"));

            List<MDFullGrpEntity> mdFullGrp = new ArrayList<>();
            for (int i = 0; i < msg111.getSequence("MDFullGrp").getLength(); i++) {
                GroupValue groupValue = msg111.getSequence("MDFullGrp").get(i);

                MDFullGrpEntity grpEntity = new MDFullGrpEntity();
                grpEntity.setNoMDEntries(groupValue.getString("NoMDEntries"));
                grpEntity.setMDEntryType(groupValue.getString("MDEntryType"));
                grpEntity.setMDEntryPx(groupValue.getString("MDEntryPx"));
                grpEntity.setMDEntrySize(groupValue.getString("MDEntrySize"));
                grpEntity.setMDEntryTime(groupValue.getString("MDEntryTime"));
                grpEntity.setMDEntryPositionNo(groupValue.getString("MDEntryPositionNo"));
                grpEntity.setTradingPhaseCode(groupValue.getString("TradingPhaseCode"));

                mdFullGrp.add(grpEntity);
            }
            refreshEntity.setMDFullGrp(mdFullGrp);
            list.add(refreshEntity);
        }
        return list;
    }

    /**
     * 确保是FAST协议包，这里不会做协议校验，解析失败会抛出异常
     * 
     * @param buff
     * @return
     */
    public static List<MDSnapshotFullRefreshEntity> decoder2(byte[] buff) throws Exception {
        if (buff == null) {
            return null;
        }

        List<MDSnapshotFullRefreshEntity> list = new ArrayList<>();

        if (contextDecoder2 == null) {
            ClassPathResource classPathResource = new ClassPathResource("template/template.xml");
            InputStream inputStream = classPathResource.getStream();
            //一个模板文件可能包含多个模板，我这里只有1个，省事就直接搞了
            MessageTemplate template = new XMLMessageTemplateLoader().load(inputStream)[0];
            contextDecoder2 = new Context();
            contextDecoder2.registerTemplate(4001, template);

        }
        //解码器
        fastDecoder = new FastDecoder(contextDecoder2, new ByteArrayInputStream(buff));
        //解码
        Message msg111 = null;
        while ((msg111 = fastDecoder.readMessage()) != null) {

            MDSnapshotFullRefreshEntity refreshEntity = new MDSnapshotFullRefreshEntity();

            refreshEntity.setMDStreamID(msg111.getString("MDStreamID"));
            refreshEntity.setSecurityID(msg111.getString("SecurityID"));
            refreshEntity.setSymbol(new String(msg111.getBytes("Symbol"), "GBK"));
            refreshEntity.setNumTrades(msg111.getString("NumTrades"));
            refreshEntity.setTradeVolume(msg111.getString("TradeVolume"));
            refreshEntity.setTotalValueTraded(msg111.getString("TotalValueTraded"));
            refreshEntity.setPrevClosePx(msg111.getString("PrevClosePx"));
            refreshEntity.setPrevSetPx(msg111.getString("PrevSetPx"));
            refreshEntity.setTotalLongPosition(msg111.getString("TotalLongPosition"));

            List<MDFullGrpEntity> mdFullGrp = new ArrayList<>();
            for (int i = 0; i < msg111.getSequence("MDFullGrp").getLength(); i++) {
                GroupValue groupValue = msg111.getSequence("MDFullGrp").get(i);

                MDFullGrpEntity grpEntity = new MDFullGrpEntity();
                grpEntity.setNoMDEntries(groupValue.getString("NoMDEntries"));
                grpEntity.setMDEntryType(groupValue.getString("MDEntryType"));
                grpEntity.setMDEntryPx(groupValue.getString("MDEntryPx"));
                grpEntity.setMDEntrySize(groupValue.getString("MDEntrySize"));
                grpEntity.setMDEntryTime(groupValue.getString("MDEntryTime"));
                grpEntity.setMDEntryPositionNo(groupValue.getString("MDEntryPositionNo"));
                grpEntity.setTradingPhaseCode(groupValue.getString("TradingPhaseCode"));

                mdFullGrp.add(grpEntity);
            }
            refreshEntity.setMDFullGrp(mdFullGrp);
            list.add(refreshEntity);
        }
        return list;
    }
}

(4) サンプルデータと呼び出しコード

        byte[] testByte = {-4, 31, -95, 77, 68, 48, 48, -79, 48, 48, 48, 49, 50, -78, -119, -59, -87, -46, -75, -42, -9, -52, -30, -128, 46, -75, -127, 9, 98, 58, -113, 127, 127, 127, 127, -4, 10, 11, 36, -53, -128, -128, -123, -64, -77, 127, 127, 127, 127, -4, 10, 41, 60, -49, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 104, 46, -36, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 34, 17, -80, -128, -128, -128, -72, -125, 117, 88, 124, -46, -128, -128, -104, -77, -119, 49, 56, 48, -74, -81, -52, -84, 32, -128, 1, 80, -126, -127, 37, 13, 102, -85, -127, 29, 6, 41, -60, -128, -128, -64, -77, -126, 120, 38, -42, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -3, 39, 49, 114, -71, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 1, 78, 31, -86, -128, -128, -128, -72, -127, 126, 42, 48, -116, -128, -128, -104, -75, -119, 49, 56, 48, -50, -56, -74, -88, 32, -128, 2, 83, -115, -127, 45, 18, 16, -31, -127, 16, 73, 6, -118, -128, -128, -64, -77, -127, 18, 83, 32, -95, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 126, 63, 44, -56, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 1, 95, 26, -9, -128, -128, -128, -72, -127, 126, 32, 101, -119, -128, -128, -104, -74, -119, -49, -5, -73, -47, 53, 48, 32, 32, -128, 123, 80, -36, -127, 78, 126, 8, -112, -127, 1, 126, 71, -25, -128, -128, -64, -77, -127, 5, 41, 41, -108, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 124, 38, 52, -57, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 4, 66, 91, -18, -128, -128, -128, -72, -127, 123, 61, 36, -110, -128, -128, -104, -72, -119, 51, 56, 48, -69, -7, -79, -66, 32, -128, 2, 27, -72, -127, 114, 97, 18, -74, -127, 106, 116, 110, -24, -128, -128, -64, -77, -127, 106, 127, 31, -65, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 74, 38, -110, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 54, 86, -15, -128, -128, -128, -72, -127, 73, 41, -113, -128, -128, -104, -71, -119, 49, 56, 48, -78, -88, -74, -81, 32, -128, 2, 73, -57, -127, 63, 52, 32, -29, -127, 29, 75, 47, -75, -128, -128, -64, -77, -127, 31, 71, 28, -102, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 126, 29, 97, -54, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 1, 111, 87, -45, -128, -128, -128, -72, -127, 126, 16, 40, -83, -128, -128, -104, 51, -80, -119, 51, 56, 48, -78, -88, -74, -81, 32, -128, 123, 121, -20, -127, 127, 41, 10, 12, -97, -127, 114, 108, 0, -80, -128, -128, -64, -77, -127, 115, 28, 109, -42, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 57, 3, -71, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 73, 125, -65, -128, -128, -128, -72, -127, 127, 54, 2, -63, -128, -128, -104, -79, -119, -55, -49, -42, -92, -72, -33, -48, -62, -128, 127, 35, -52, -127, 2, 9, 51, -95, -127, 85, 8, 29, -117, -128, -128, -64, -77, -127, 85, 0, 53, -115, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 125, 119, -11, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 12, 126, -72, -128, -128, -128, -72, -127, 115, 1, -56, -128, -128, -104, -78, -119, -55, -49, -42, -92, 49, 48, 48, 32, -128, 5, -64, -127, 125, 65, 11, -92, -127, 28, 11, 54, -107, -128, -128, -64, -77, -127, 28, 92, 50, -93, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 59, 5, -112, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 68, 122, -16, -128, -128, -128, -72, -127, 127, 52, 28, -12, -128, -128, -104, -77, -119, -55, -49, -42, -92, 49, 53, 48, 32, -128, 112, -112, -127, 124, 75, 8, -92, -127, 116, 60, 125, -59, -128, -128, -64, -77, -127, 116, 90, 73, -10, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 107, 93, -78, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 23, 49, -27, -128, -128, -128, -72, -127, 101, 121, -9, -128, -128, -104, -76, -119, -55, -49, -42, -92, -46, -8, -48, -48, -128, 1, 45, -64, -127, 15, 100, 17, -75, -126, 101, 91, 8, -48, -128, -128, -64, -77, -127, 105, 16, 59, -32, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 116, 121, -99, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 12, 53, -125, -128, -128, -128, -72, -127, 113, 108, -116, -128, -128, -104, -75, -119, 49, 56, 48, -72, -33, -79, -76, 32, -128, 124, -84, -127, 60, 21, 127, -49, 127, 127, 127, 127, -1, 31, 76, 127, -17, -128, -128, -64, -77, -126, 127, 63, 3, -114, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -1, 28, 106, 33, -75, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -126, 99, 21, 94, -53, -128, -128, -128, -72, 127, 127, 127, 127, -1, 28, 106, 33, -75, -128, -128, -104, -74, -119, 49, 56, 48, -75, -51, -79, -76, 32, -128, 2, 31, -73, -127, 68, 61, 61, -18, -127, 20, 86, 86, -99, -128, -128, -64, -77, -127, 22, 39, 114, -100, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 126, 94, 45, -108, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 1, 44, 72, -6, -128, -128, -128, -72, -127, 126, 73, 80, -87, -128, -128, -104, -73, -119, 51, 56, 48, -72, -33, -79, -76, 32, -128, 125, 23, -120, -127, 125, 83, 85, -12, -127, 103, 65, 113, -71, -128, -128, -64, -77, -127, 103, 67, 4, -83, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -126, 102, 21, 17, -23, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, 127, 127, 127, 127, -1, 25, 114, 43, -81, -128, -128, -128, -72, -126, 102, 13, 84, -47, -128, -128, -104, -72, -119, 51, 56, 48, -75, -51, -79, -76, 32, -128, 89, -42, -127, 114, 125, 63, -6, -127, 3, 116, 90, -126, -128, -128, -64, -77, 127, 127, 127, 127, -1, 29, 96, 30, -121, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 72, 39, -90, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 56, 5, -72, -128, -128, -128, -72, -127, 71, 122, -56, -128, -128, -104, -71, -119, -55, -49, -42, -92, -41, -86, -43, -82, -128, 2, 116, -88, -127, 31, 81, 47, -21, -127, 97, 88, 27, -56, -128, -128, -64, -77, -126, 96, 4, 2, -68, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -1, 1, 76, 46, -32, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -126, 126, 51, 81, -96, -128, -128, -128, -72, 127, 127, 127, 127, -1, 1, 69, 90, -89, -128, -128, -4, 31, -95, 77, 68, 48, 48, -79, 48, 48, 48, 49, 52, -78, -119, 51, 56, 48, -50, -56, -74, -88, 32, -128, 1, 22, -30, -127, 10, 84, 124, -78, 127, 127, 127, 127, -3, 4, 40, 110, -51, -128, -128, -123, -64, -77, 127, 127, 127, 127, -4, 44, 12, 49, -111, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 37, 31, -85, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 91, 7, -33, -128, -128, -128, -72, -127, 127, 34, 57, -117, -128, -128, -104, -75, -119, -45, -59, -54, -58, -41, -54, -44, -76, -128, 71, -69, -126, 118, 17, 51, -51, 127, 127, 127, 127, -1, 20, 72, 13, -72, -128, -128, -64, -77, -127, 110, 18, 57, -93, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 57, 79, -68, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 73, 74, -76, -128, -128, -128, -72, -127, 127, 31, 102, -53, -128, -128, -104, -74, -119, -45, -59, -54, -58, -42, -58, -44, -20, -128, 1, 19, -16, 127, 127, 127, 127, -1, 41, 105, 4, -88, -126, 107, 110, 80, -128, -128, -128, -64, -77, -127, 23, 123, 0, -22, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 28, 52, -29, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 111, 114, -4, -128, -128, -128, -72, -127, 126, 126, 44, -92, -128, -128, -104, -73, -119, -45, -59, -54, -58, -49, -5, -73, -47, -128, 126, 72, -2, -127, 10, 5, 115, -16, 127, 127, 127, 127, -2, 3, 105, 7, 120, -6, -128, -128, -64, -77, -127, 4, 105, 70, -7, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 125, 11, 97, -55, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 3, 28, 65, -93, -128, -128, -128, -72, -127, 124, 98, 123, -35, -128, -128, -104, -72, -119, -49, -5, -73, -47, -63, -20, -49, -56, -128, 2, 127, -14, -127, 42, 48, 103, -20, -127, 13, 78, 124, -88, -128, -128, -64, -77, -127, 3, 105, 66, -47, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 125, 80, 84, -20, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 2, 69, 127, -116, -128, -128, -128, -72, -127, 125, 55, 84, -9, -128, -128, -104, -71, -119, 49, 56, 48, -70, -20, -64, -5, 32, -128, 126, 31, -67, -127, 127, 41, 115, 112, -96, -126, 124, 20, 21, 45, -16, -128, -128, -64, -77, -127, 92, 99, 123, -4, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 85, 74, -18, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 43, 14, -104, -128, -128, -128, -72, -126, 113, 75, 5, -92, -128, -128, -104, 53, -80, -119, 51, 56, 48, -70, -20, -64, -5, 32, -128, 126, 67, -59, -127, 120, 60, 99, -9, -127, 31, 76, 100, -56, -128, -128, -64, -77, 127, 127, 127, 127, -1, 46, 34, 47, -100, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 127, 51, 106, -21, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -126, 85, 72, 0, -44, -128, -128, -128, -72, 127, 127, 127, 127, -1, 42, 55, 127, -84, -128, -128, -104, -79, -119, -55, -49, -71, -6, -70, -20, -64, -5, -128, 0, 106, -57, -127, 2, 50, 21, -81, -127, 86, 84, 127, -46, -128, -128, -64, -77, -126, 81, 47, 73, -48, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -1, 5, 35, 4, -92, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -126, 122, 93, 20, -75, -128, -128, -128, -72, 127, 127, 127, 127, -1, 5, 34, 16, -90, -128, -128, -104, -78, -119, -55, -49, -47, -21, -70, -20, -64, -5, -128, 30, -122, -127, 1, 7, 4, -14, 127, 127, 127, 127, -1, 0, 95, 50, 117, -44, -128, -128, -64, -77, -127, 4, 62, 83, -88, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 105, 72, -2, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 22, 86, -94, -128, -128, -128, -72, -127, 94, 61, -3, -128, -128, -104, -77, -119, -55, -49, -61, -15, -70, -20, -64, -5, -128, 126, 106, -47, -127, 124, 38, 15, -83, -126, 127, 41, 100, 1, -6, -128, -128, -64, -77, -126, 119, 56, 74, -74, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -1, 13, 75, 88, -111, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 34, 71, -98, -128, -128, -128, -72, -127, 91, 41, -119, -128, -128, -104, -75, -119, -54, -48, -42, -75, -80, -39, -57, -65, -128, 5, 77, -30, -126, 11, 76, 34, -1, -127, 0, 74, 78, -59, -128, -128, -64, -77, -127, 1, 26, 43, -88, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 65, 97, -39, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 0, 64, 39, -93, -128, -128, -128, -72, -127, 127, 63, 88, -35, -128, -128, -104, -72, -119, -55, -49, -42, -92, -69, -73, -79, -93, -128, 123, 64, -84, 127, 127, 127, 127, -1, 22, 101, 91, -66, -127, 123, 77, 56, -76, -128, -128, -64, -77, -126, 113, 41, 3, -96, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, 127, 127, 127, 127, -1, 10, 22, 42, -9, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 25, 74, -121, -128, -128, -128, -72, -127, 100, 122, -80, -128, -128, -104, -71, -119, -69, -90, -71, -55, -51, -88, 32, 32, -128, 8, 101, -97, -127, 1, 9, 72, 93, -77, -127, 6, 29, 56, -51, -128, -128, -64, -77, -127, 6, 102, 45, -42, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 65, 90, -23, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 63, 67, -111, -128, -128, -128, -72, -127, 64, 60, -17, -128, -128, -104, 54, -80, -119, -69, -90, -48, -62, -53, -65, -62, -73, -128, 120, 32, -2, -127, 126, 96, 109, 30, -71, -127, 120, 14, 92, -28, -128, -128, -64, -77, -127, 120, 31, 16, -83, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 96, 112, -82, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 33, 101, -11, -128, -128, -128, -72, -127, 92, 77, -45, -128, -128, -104, -79, -119, -69, -90, -42, -48, -71, -6, -44, -20, -128, 96, -127, -127, 32, 87, 108, -69, -126, 119, 73, 111, -77, -128, -128, -64, -77, -127, 2, 16, 42, -5, -128, 49, 48, 51, 49, 48, 51, 48, -80, -128, -64, -76, -127, 101, 32, -61, -128, -128, -128, -128, -75, -128, -128, -128, -128, -73, -127, 26, 95, -67, -128, -128, -128, -72, -127, 99, 66, -7, -128, -128};
        try {
            long time = System.currentTimeMillis();
            for (int i = 0; i < 5000; i++) {
                FastDecoderUtils.decoder2(testByte);
            }
            log.error("方法1用时：{}", System.currentTimeMillis() - time);

            Thread.sleep(2000);

            time = System.currentTimeMillis();
            for (int i = 0; i < 5000; i++) {
                FastDecoderUtils.decoder1(testByte);
            }
            log.error("方法2用时：{}", System.currentTimeMillis() - time);
        } catch (Exception e) {
            e.printStackTrace();
        }

余談: 上記の testByte は実際のデータですが、このテンプレートで正常に解析できない場合は、独自の理由を見つける必要があります。

要約する

2 つの解析方法のコード比較ですが、個人的には 2 番目の解析方法の方が理解しやすいと思います。最初にテンプレートを見つけ、次に新しいコンテキストを作成し、次にデコードするデコーダを見つけるというプロセスが非常にスムーズです。しかし、真実は常に顔を平手打ちするのが好きです。

このデータパケットには約 34 個のデータが含まれていますが、ループ解析回数によると、方法 1 の効率が方法 2 よりもはるかに高く、時間の経過とともにその差が大きくなっているのではないかと推測されます。デコーダを再構築する理由。実行結果のいくつかの比較を次に示します。

100回：方法1（146ミリ秒）、方法2（164ミリ秒）

500回：方法1(635ms)、方法2(736ms)

1000回：方法1（386ms）、方法2（2230ms）

5000回：方法1(2939ms)、方法2(34628ms)

要約すると、方法 1 を使用することをお勧めします。

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