解析Springboot集成Tile38客戶端之Set命令實(shí)現(xiàn)示例

更新時(shí)間：2022年08月20日 14:32:04 作者：夢(mèng)想實(shí)現(xiàn)家_Z

這篇文章主要為大家介紹了解析Springboot集成Tile38客戶端之Set命令實(shí)現(xiàn)示例詳解，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進(jìn)步，早日升職加薪

set命令語法

SET key id [FIELD name value ...] [EX seconds] [NX|XX] (OBJECT geojson)|(POINT lat lon z)|(BOUNDS minlat minlon maxlat maxlon)|(HASH geohash)|(STRING value)

set命令就相當(dāng)于redis中的hash命令的使用，也是一個(gè)key和id的組合，但是不同的是，Tile38的set命令還可以攜帶更多的其他屬性，比如可以自定義FIELD字段，還可以設(shè)置EX有效期等等，那么我們需要給這個(gè)語法設(shè)計(jì)一套好用的java api，以便開發(fā)人員可以更好地使用Tile38。

語法分析

首先，根據(jù)上面提供的語法，我們可以分為三部分：

1.第一部分就是命令的啟示關(guān)鍵字SET，我們把這個(gè)關(guān)鍵字單獨(dú)作為一部分；

2.第二部分就是key id [FIELD name value ...] [EX seconds] [NX|XX]，我們把這些都作為參數(shù)；

3.第三部分就是最后的目標(biāo)數(shù)據(jù)對(duì)象：

(OBJECT geojson)|(POINT lat lon z)|(BOUNDS minlat minlon maxlat maxlon)|(HASH geohash)|(STRING value)

代碼設(shè)計(jì)

1.我們把第一部分的命令關(guān)鍵字通過枚舉的方式來管理：

enum Tile38Command implements ProtocolKeyword {
    SET;
    public final byte[] bytes;
    static final String UNDERSCORE = "_";
    static final String SPACE = " ";
    Tile38Command() {
      String name = StringUtils.replace(this.name(), UNDERSCORE, SPACE);
      this.bytes = name.getBytes(StandardCharsets.US_ASCII);
    }
    @Override
    public byte[] getBytes() {
      return this.bytes;
    }
}

因?yàn)閞edis客戶端工具在發(fā)送命令前需要對(duì)所有命令進(jìn)行編碼，所以要求所有的命令都必須實(shí)現(xiàn)ProtocolKeyword接口。如果命令的起始關(guān)鍵字是兩個(gè)或多個(gè)單詞，那么我們會(huì)使用下劃線連接，轉(zhuǎn)換成bytes的時(shí)候我們可以使用空格把下劃線替換。

2.我們把命令的第二部分抽象成一個(gè)具體的class，通過相關(guān)的字段來進(jìn)行描述：

public class SetOpts {
  private String key;
  private String id;
  //字段值必須是雙精度浮點(diǎn)型
  private Map<String, Double> fields;
  // 單位秒
  private int ex;
  // 創(chuàng)建方式：
  // NX 不存在的時(shí)候創(chuàng)建
  // XX 存在的時(shí)候更新
  private NxXx nxXx;
  private SetOpts(Builder builder) {
    this.key = builder.key;
    this.id = builder.id;
    this.fields = builder.fields;
    this.ex = builder.ex;
    this.nxXx = builder.nxXx;
  }
  
  // 把所有的參數(shù)按順序放到列表中
  public List<String> commandLine() {
    List<String> result = new LinkedList<>();
    result.add(this.key);
    result.add(this.id);
    // 添加所有的FIELD
    if (MapUtils.isNotEmpty(this.fields)) {
      for (Map.Entry<String, Double> entry : this.fields.entrySet()) {
        result.add("FIELD");
        result.add(entry.getKey());
        result.add(entry.getValue().toString());
      }
    }
    // 添加`EX`
    if (this.ex >= 0) {
      result.add("EX");
      result.add(String.valueOf(this.ex));
    }
    // 添加NX或XX
    if (Objects.nonNull(this.nxXx)) {
      result.add(this.nxXx.name());
    }
    // 返回結(jié)果
    return result;
  }
  
  public enum NxXx {
    NX,
    XX
  }
  // 建造者模式
  public static class Builder {
    private String key;
    private String id;
    //字段值必須是雙精度浮點(diǎn)型
    private Map<String, Double> fields;
    // 單位秒
    private int ex = -1;
    // 創(chuàng)建方式：
    // NX 不存在的時(shí)候創(chuàng)建
    // XX 存在的時(shí)候更新
    private NxXx nxXx;
    public Builder key(String key) {
      this.key = key;
      return this;
    }
    public Builder id(String id) {
      this.id = id;
      return this;
    }
    public Builder field(String field, double value) {
      if (Objects.isNull(this.fields)) {
        this.fields = new LinkedHashMap<>();
      }
      this.fields.put(field, value);
      return this;
    }
    public Builder ex(int seconds) {
      this.ex = seconds;
      return this;
    }
    public Builder nxXx(NxXx nxXx) {
      this.nxXx = nxXx;
      return this;
    }
    public SetOpts build() throws AwesomeException {
      if (StringUtils.isEmpty(this.key)) {
        throw new AwesomeException(500, "key is empty");
      }
      if (StringUtils.isEmpty(this.id)) {
        throw new AwesomeException(500, "id is empty");
      }
      // 創(chuàng)建SetOpts對(duì)象
      return new SetOpts(this);
    }
  }
}

我們上面通過建造者的設(shè)計(jì)模式，把所有的參數(shù)都轉(zhuǎn)換成了SetOpts這個(gè)類當(dāng)中，開發(fā)人員就可以通過SetOpts對(duì)象的構(gòu)建來靈活地控制命令中的參數(shù)了。

3.我們需要把第三部分當(dāng)中的不同數(shù)據(jù)對(duì)象轉(zhuǎn)換成不同的類型：

POINT數(shù)據(jù)類型

Point關(guān)鍵的字段就是經(jīng)緯度，除此之外，還有一個(gè)額外的字段z，用來存儲(chǔ)額外的業(yè)務(wù)參數(shù)，可為空。

public class Point extends Element implements Serializable {
  // 經(jīng)度
  private double lng;
  // 維度
  private double lat;
  // 額外的數(shù)據(jù)
  private double z;
  public Point(double lng, double lat, double z) {
    this.lat = lat;
    this.lng = lng;
    this.z = z;
  }
  public Point(double lng, double lat) {
    this(lng, lat, Integer.MIN_VALUE);
  }
  @Override
  public List<String> commandArgs() {
    List<String> result = new LinkedList<>();
    result.add("POINT");
    result.add(String.valueOf(this.lng));
    result.add(String.valueOf(this.lat));
    if (this.z != Integer.MIN_VALUE) {
      result.add(String.valueOf(this.z));
    }
    return result;
  }
}

BOUNDS數(shù)據(jù)類型

BOUNDS就是矩形，它的關(guān)鍵字段就是左下角和右上角兩個(gè)點(diǎn)位，我們使用coordinate1和coordinate2來表示左下角和右上角；

@AllArgsConstructor
public class Bounds extends Element {
  private double[] coordinate1;
  private double[] coordinate2;
  @Override
  public List<String> commandArgs() {
    List<String> result = new LinkedList<>();
    result.add("BOUNDS");
    result.add(String.valueOf(coordinate1[0]));
    result.add(String.valueOf(coordinate1[1]));
    result.add(String.valueOf(coordinate2[0]));
    result.add(String.valueOf(coordinate2[1]));
    return result;
  }
}

HASH和STRING數(shù)據(jù)類型

HASH和STRING其實(shí)就是一個(gè)單獨(dú)的字符串，但是我們還是把它封裝一下，以便開發(fā)人員使用；

@AllArgsConstructor
public class Geohash extends Element {
  private String hash;
  @Override
  public List<String> commandArgs() {
    List<String> result = new LinkedList<>();
    result.add("HASH");
    result.add(this.hash);
    return result;
  }
}
@AllArgsConstructor
public class RawString extends Element {
  private String raw;
  @Override
  public List<String> commandArgs() {
    List<String> result = new LinkedList<>();
    result.add("STRING");
    result.add(this.raw);
    return result;
  }
}

OBJECT數(shù)據(jù)類型

OBJECT其實(shí)就是GeoJSON數(shù)據(jù)，這一類數(shù)據(jù)比較復(fù)雜一點(diǎn)，一共有六種類型，想了解的小伙伴可以看這里geojson.org/

Point,
LineString,
Polygon,
MultiPoint,
MultiLineString,
MultiPolygon

為了開發(fā)人員能夠更好的使用這六種類型，我們同樣使用建造者模式來設(shè)計(jì)一下GeoJSON數(shù)據(jù)類型：

@Data
public class GeoJson {
  public static class Builder {
    public Point.Builder point() {
      return new Point.Builder();
    }
    public MultiPoint.Builder multPoint() {
      return new MultiPoint.Builder();
    }
    public LineString.Builder lineString() {
      return new LineString.Builder();
    }
    public MultiLineString.Builder multiLineString() {
      return new MultiLineString.Builder();
    }
    public Polygon.Builder polygon() {
      return new Polygon.Builder();
    }
    public MultiPolygon.Builder multiPolygon() {
      return new MultiPolygon.Builder();
    }
  }
}

我們現(xiàn)在一個(gè)大類里面創(chuàng)建多個(gè)方法，每一個(gè)方法都把對(duì)應(yīng)類型的建造者給創(chuàng)造出來，這樣的話，就相當(dāng)于這個(gè)類當(dāng)中有創(chuàng)建六種對(duì)象的方式，每個(gè)建造者都只負(fù)責(zé)建造對(duì)應(yīng)的那個(gè)對(duì)象。

下面分別是六個(gè)建造者的代碼，每個(gè)對(duì)象都基于最基本的BaseGeoJson來構(gòu)造，BaseGeoJson中把公共的字段type和額外的meta字段抽出來，各個(gè)類型不同的點(diǎn)在于坐標(biāo)點(diǎn)的數(shù)量和層次不同，所以根據(jù)各自類型的特點(diǎn)，代碼設(shè)計(jì)如下：

// Point類型
  public static class Point extends BaseGeoJson {
    // 坐標(biāo)點(diǎn)
    private double[] coordinates;
    Point(Builder builder) {
      super(builder);
      this.type = GeoJsonType.Point;
      this.coordinates = builder.coordinates;
    }
    @Override
    protected Object coordinates() {
      return this.coordinates;
    }
    public static class Builder extends BaseGeoJson.Builder {
      private double[] coordinates;
      public Builder coordinate(double lon, double lat) {
        coordinates = new double[]{lat, lon};
        return this;
      }
      public Point build() {
        return new Point(this);
      }
    }
  }
// MultiPoint類型
  public static class MultiPoint extends BaseGeoJson {
    private double[][] coordinates;
    MultiPoint(Builder builder) {
      super(builder);
      this.type = GeoJsonType.MultiPoint;
      this.coordinates = builder.convert2Array();
    }
    @Override
    protected Object coordinates() {
      return this.coordinates;
    }
    public static class Builder extends BaseGeoJson.Builder {
      private List<Coordinate> coordinates;
      public Builder coordinate(double lon, double lat) {
        if (CollectionUtils.isEmpty(this.coordinates)) {
          this.coordinates = new LinkedList<>();
        }
        this.coordinates.add(new Coordinate(lat, lon));
        return this;
      }
      protected double[][] convert2Array() {
        int length = this.coordinates.size();
        double[][] result = new double[length][];
        for (int i = 0; i < length; i++) {
          result[i] = this.coordinates.get(i).convertToArray();
        }
        return result;
      }
      @Override
      public MultiPoint build() {
        return new MultiPoint(this);
      }
    }
  }
// LineString類型
  public static class LineString extends MultiPoint {
    private double[][] coordinates;
    LineString(Builder builder) {
      super(builder);
      this.type = GeoJsonType.LineString;
    }
    public static class Builder extends MultiPoint.Builder {
      @Override
      public LineString build() {
        return new LineString(this);
      }
    }
  }
// MultiLineString類型
  public static class MultiLineString extends BaseGeoJson {
    private double[][][] coordinates;
    MultiLineString(Builder builder) {
      super(builder);
      this.type = GeoJsonType.MultiLineString;
      this.coordinates = builder.convertToArray();
    }
    @Override
    protected Object coordinates() {
      return this.coordinates;
    }
    public static class Builder extends BaseGeoJson.Builder {
      private List<Line> lines = new LinkedList<>();
      public Line line() {
        return new Line(this);
      }
      void addLine(Line line) {
        lines.add(line);
      }
      double[][][] convertToArray() {
        int length = this.lines.size();
        double[][][] result = new double[length][][];
        for (int i = 0; i < length; i++) {
          Line line = this.lines.get(i);
          result[i] = line.convert2Array();
        }
        return result;
      }
      @Override
      public BaseGeoJson build() {
        return new MultiLineString(this);
      }
    }
    static class Line {
      private List<Coordinate> coordinates;
      private Builder builder;
      Line(Builder builder) {
        this.builder = builder;
        this.builder.addLine(this);
      }
      private double[][] convert2Array() {
        int length = this.coordinates.size();
        double[][] result = new double[length][];
        for (int i = 0; i < length; i++) {
          result[i] = this.coordinates.get(i).convertToArray();
        }
        return result;
      }
      public Line coordinate(double lon, double lat) {
        if (CollectionUtils.isEmpty(this.coordinates)) {
          this.coordinates = new LinkedList<>();
        }
        this.coordinates.add(new Coordinate(lat, lon));
        return this;
      }
      public Line nextLine() {
        return new Line(this.builder);
      }
      public Builder end() {
        return this.builder;
      }
    }
  }
// Polygon類型
  public static class Polygon extends MultiPoint {
    private double[][][] coordinates;
    Polygon(Builder builder) {
      super(builder);
      this.type = GeoJsonType.Polygon;
      this.coordinates = new double[][][]{builder.convert2Array()};
    }
    public static class Builder extends MultiPoint.Builder {
      @Override
      public Polygon build() {
        return new Polygon(this);
      }
    }
  }
// MultiPolygon類型
  public static class MultiPolygon extends BaseGeoJson {
    private double[][][][] coordinates;
    MultiPolygon(Builder builder) {
      super(builder);
      this.type = GeoJsonType.MultiPolygon;
      this.coordinates = new double[][][][]{builder.convert2Array()};
    }
    @Override
    protected Object coordinates() {
      return this.coordinates;
    }
    public static class Builder extends BaseGeoJson.Builder {
      private List<Polygon> polygons = new LinkedList<>();
      @Override
      public BaseGeoJson build() {
        return new MultiPolygon(this);
      }
      void addPolygon(Polygon polygon) {
        polygons.add(polygon);
      }
      private double[][][] convert2Array() {
        int length = this.polygons.size();
        double[][][] result = new double[length][][];
        for (int i = 0; i < length; i++) {
          result[i] = this.polygons.get(i).convert2Array();
        }
        return result;
      }
    }
    static class Polygon {
      private List<Coordinate> coordinates;
      private Builder builder;
      Polygon(Builder builder) {
        this.builder = builder;
        this.builder.addPolygon(this);
      }
      private double[][] convert2Array() {
        int length = this.coordinates.size();
        double[][] result = new double[length][];
        for (int i = 0; i < length; i++) {
          result[i] = this.coordinates.get(i).convertToArray();
        }
        return result;
      }
      public Polygon coordinate(double lon, double lat) {
        if (CollectionUtils.isEmpty(this.coordinates)) {
          this.coordinates = new LinkedList<>();
        }
        this.coordinates.add(new Coordinate(lat, lon));
        return this;
      }
      public Polygon nextLine() {
        return new Polygon(this.builder);
      }
      public Builder end() {
        return this.builder;
      }
    }
  }
// 基類BaseGeoJson
  public abstract static class BaseGeoJson extends Element {
    // 公共字段type
    protected GeoJsonType type;
    // 公共字段metadata
    private Map<String, String> metadata;
    BaseGeoJson(Builder builder) {
      this.metadata = builder.metadata;
    }
    protected abstract Object coordinates();
    // 轉(zhuǎn)換成命令參數(shù)
    @Override
    public List<String> commandArgs() {
      List<String> result = new LinkedList<>();
      result.add("OBJECT");
      result.add(toJson());
      return result;
    }
    // 提供統(tǒng)一的轉(zhuǎn)json方法
    protected String toJson() {
      Map<String, Object> map = new LinkedHashMap<>();
      map.put("type", this.type);
      map.put("coordinates", coordinates());
      if (!CollectionUtils.isEmpty(this.metadata)) {
        for (Map.Entry<String, String> entry : this.metadata.entrySet()) {
          map.put(entry.getKey(), entry.getValue());
        }
      }
      return JsonUtil.obj2String(map);
    }
    abstract static class Builder {
      private Map<String, String> metadata;
      public Builder meta(String key, String value) {
        if (MapUtils.isEmpty(this.metadata)) {
          this.metadata = new LinkedHashMap<>();
        }
        this.metadata.put(key, value);
        return this;
      }
      public abstract BaseGeoJson build();
    }
    static class Coordinate {
      private double lat;
      private double lon;
      Coordinate(double lat, double lon) {
        this.lat = lat;
        this.lon = lon;
      }
      public double[] convertToArray() {
        return new double[]{this.lat, this.lon};
      }
    }
    // GeoJSON所有的數(shù)據(jù)類型
    enum GeoJsonType {
      Point,
      LineString,
      Polygon,
      MultiPoint,
      MultiLineString,
      MultiPolygon
    }
  }

最后，再補(bǔ)充一個(gè)基類Element：

public abstract class Element implements Serializable {
  public abstract List<String> commandArgs();
}

如何使用

我們針對(duì)所有的數(shù)據(jù)類型全部轉(zhuǎn)換成具體的代碼設(shè)計(jì)，下面我們看看如何使用：

private String setElement(SetOpts setOpts, Element element) {
    List<String> args1 = setOpts.commandLine();
    List<String> commandArgs = element.commandArgs();
    return execute(Tile38Command.SET, args1, commandArgs);
}
/**
   * 設(shè)置點(diǎn)位
   *
   * @param setOpts
   * @param point
   * @return
   */
  public String setPoint(SetOpts setOpts, Point point) {
    return setElement(setOpts, point);
  }
  /**
   * 設(shè)置對(duì)象
   *
   * @param setOpts
   * @param geoJson
   * @return
   */
  public String setObject(SetOpts setOpts, GeoJson.BaseGeoJson geoJson) {
    return setElement(setOpts, geoJson);
  }
  /**
   * 設(shè)置矩形邊界
   *
   * @param setOpts
   * @param bounds
   * @return
   */
  public String setBounds(SetOpts setOpts, Bounds bounds) {
    return setElement(setOpts, bounds);
  }
  /**
   * 設(shè)置geohash
   *
   * @param setOpts
   * @param geohash
   * @return
   */
  public String setGeohash(SetOpts setOpts, Geohash geohash) {
    return setElement(setOpts, geohash);
  }
  /**
   * 設(shè)置String
   *
   * @param setOpts
   * @param string
   * @return
   */
  public String setString(SetOpts setOpts, RawString string) {
    return setElement(setOpts, string);
  }

所有的開發(fā)人員只需要按照上面的方法來使用就可以很方便地執(zhí)行Tile38的命令了，至此，我們所有關(guān)于SET命令的設(shè)計(jì)都已經(jīng)講解完畢。

以上就是解析Springboot集成Tile38客戶端之Set命令實(shí)現(xiàn)示例的詳細(xì)內(nèi)容，更多關(guān)于Springboot集成Tile客戶端Set命令的資料請(qǐng)關(guān)注腳本之家其它相關(guān)文章！

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