解析Springboot集成Tile38客戶端之Set命令實(shí)現(xiàn)示例
set命令語(yǔ)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(yǔ)法設(shè)計(jì)一套好用的java api,以便開(kāi)發(fā)人員可以更好地使用Tile38。
語(yǔ)法分析
首先,根據(jù)上面提供的語(yǔ)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(guò)枚舉的方式來(lái)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(guò)相關(guān)的字段來(lái)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(guò)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(lèi)當(dāng)中,開(kāi)發(fā)人員就可以通過(guò)SetOpts對(duì)象的構(gòu)建來(lái)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(lèi)型:
POINT數(shù)據(jù)類(lèi)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(lái)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(lèi)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(lái)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(lèi)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(kāi)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(lèi)型
OBJECT其實(shí)就是GeoJSON數(shù)據(jù),這一類(lèi)數(shù)據(jù)比較復(fù)雜一點(diǎn),一共有六種類(lèi)型,想了解的小伙伴可以看這里geojson.org/
Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon
為了開(kāi)發(fā)人員能夠更好的使用這六種類(lèi)型,我們同樣使用建造者模式來(lái)設(shè)計(jì)一下GeoJSON數(shù)據(jù)類(lèi)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(lèi)里面創(chuàng)建多個(gè)方法,每一個(gè)方法都把對(duì)應(yīng)類(lèi)型的建造者給創(chuàng)造出來(lái),這樣的話,就相當(dāng)于這個(gè)類(lèi)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(lái)構(gòu)造,BaseGeoJson中把公共的字段type和額外的meta字段抽出來(lái),各個(gè)類(lèi)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(lèi)型的特點(diǎn),代碼設(shè)計(jì)如下:
// Point類(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lèi)型
enum GeoJsonType {
Point,
LineString,
Polygon,
MultiPoint,
MultiLineString,
MultiPolygon
}
}
最后,再補(bǔ)充一個(gè)基類(lèi)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(lèi)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(kāi)發(fā)人員只需要按照上面的方法來(lái)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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