Анализ протокола FAST (3) заполнить шаблон и вопросы эффективности анализа

ерунда

В предыдущей главе были представлены два типа кодов синтаксического анализа (процесс в основном такой же), на этот раз я опубликую данные примера вместе и обсудим эффективность синтаксического анализа.

Есть еще один момент, которого следует избегать. Документ данных и документ шаблона, указанные там, вызовут ошибки при разборе полей. Например, шаблон FAST определяется как поле uInt64, как поясняется в документе протокола. беззнаковое 64-битное целое, то есть положительное целое число от 0 до 2 в степени 64. Насколько я понимаю, это тип Long в Java, но на самом деле я вызываю метод getLong() для получения Value, там высока вероятность того, что будет сообщено об ошибке, то есть тип протокола отличается от типа, определенного Java (или мое понимание может быть неправильным).

Вот и причина такого типа, я ленивый, все используют метод getString(), то есть все значения берутся в виде строк. Само собой разумеется, что получение правильного значения должно быть более эффективным.

играть

(1) Шаблон (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) Объект, соответствующий шаблону (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) Класс инструментов анализа (FastDecoderUtils)

Вот два метода вызова проанализированного кода.Хотя они выглядят одинаково, все же есть некоторые различия в эффективности.

@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) Пример данных и код вызова

        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();
        }

Отступление: приведенный выше testByte — это реальные данные.Если вы не можете успешно проанализировать их с помощью этого шаблона, вам нужно найти свои собственные причины.

Подведем итог

Сравнение кода двух методов синтаксического анализа, лично я думаю, что второй более дружелюбен к моему личному пониманию.Сначала найдите шаблон, затем создайте новый контекст, а затем найдите декодер для декодирования.Процесс очень плавный. Однако правда всегда любит дать пощечину.

Этот пакет данных содержит около 34 фрагментов данных.Согласно количеству циклов анализа, эффективность метода 1 намного выше, чем у метода 2, а разрыв увеличивается с течением времени.Предполагается, что это может быть Причина перестройки декодера Вот несколько сравнений результатов работы:

100 раз: метод 1 (146 мс), метод 2 (164 мс)

500 раз: метод 1 (635 мс), метод 2 (736 мс)

1000 раз: метод 1 (386 мс), метод 2 (2230 мс)

5000 раз: метод 1 (2939 мс), метод 2 (34628 мс)

Таким образом, рекомендуется использовать метод 1.