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GeezerVison is showing github.com — iClient-JavaScript/src/common/iServer/DataFlowService.js at master · SuperMap/iClient-JavaScript

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/* Copyright© 2000 - 2026 SuperMap Software Co.Ltd. All rights reserved.
* This program are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import {CommonServiceBase} from './CommonServiceBase';
import {Util} from '../commontypes/Util';
import {SecurityManager} from '../security/SecurityManager';
/**
* @class DataFlowService
* @deprecatedclass SuperMap.DataFlowService
* @category iServer DataFlow
* @classdesc 数据流服务类。用于实现客户端与服务器之间实现低延迟和实时数据传输。数据流服务采用 WebSocket 协议，支持全双工、双向式通信。
* 服务器可将流数据服务的分析处理结果作为数据来源向客户端广播，客户端与数据流服务建立连接后，即可自动接收服务器广播的数据。
* @extends {CommonServiceBase}
* @param {string} url - 数据流服务地址。
* @param {Object} options - 参数。
* @param {function} options.style - 设置数据加载样式。
* @param {function} [options.onEachFeature] - 设置每个数据加载 popup 等。
* @param {GeoJSONObject} [options.geometry] - 空间范围，只有在该范围内的要素才能被接收。
* @param {Object} [options.excludeField] - 过滤字段。传入此参数，接收到的信息将不包含过滤掉的字段。
* @param {boolean} [options.crossOrigin] - 是否允许跨域请求。
* @param {Object} [options.headers] - 请求头。
* @usage
*/
export class DataFlowService extends CommonServiceBase {
constructor(url, options) {
options = options || {};
/*
* @constant EVENT_TYPES
* {Array.<string>}
* 此类支持的事件类型
*/
options.EVENT_TYPES = ["broadcastSocketConnected", "broadcastSocketClosed", "broadcastSocketError", "broadcastFailed", "broadcastSucceeded", "subscribeSocketConnected", "subscribeSocketClosed", "subscribeSocketError", "messageSucceeded", "setFilterParamSucceeded"]
super(url, options);
/**
* @member {GeoJSONObject} DataFlowService.prototype.geometry
* @description 空间范围，只有在该范围内的要素才能被接收。
*/
this.geometry = null;
/**
* @member {Object} DataFlowService.prototype.prjCoordSys
* @description 动态投影参数。
*/
this.prjCoordSys = null;
/**
* @member {Object} DataFlowService.prototype.excludeField
* @description 过滤字段。传入此参数，接收到的信息将不包含过滤掉的字段。
*/
this.excludeField = null;
Util.extend(this, options);
this.CLASS_NAME = "SuperMap.DataFlowService";
}
/**
* @function DataFlowService.prototype.initBroadcast
* @description 初始化广播。
* @returns {DataFlowService} - 数据流服务。
*/
initBroadcast() {
var me = this;
this.broadcastWebSocket = this._connect(Util.urlPathAppend(me.url, 'broadcast'));
this.broadcastWebSocket.onopen = function (e) {
me.broadcastWebSocket.isOpen = true;
e.eventType = 'broadcastSocketConnected';
me.events.triggerEvent('broadcastSocketConnected', e);
};
this.broadcastWebSocket.onclose = function (e) {
if (me.broadcastWebSocket) {
me.broadcastWebSocket.isOpen = false;
}
e.eventType = 'broadcastSocketClosed';
me.events.triggerEvent('broadcastSocketClosed', e);
};
this.broadcastWebSocket.onerror = function (e) {
e.eventType = 'broadcastSocketError';
me.events.triggerEvent('broadcastSocketError', e);
};
return this;
}
/**
* @function DataFlowService.prototype.broadcast
* @description 加载广播数据。
* @param {GeoJSONObject} geoJSONFeature - JSON 格式的要素数据。
*/
broadcast(geoJSONFeature) {
if (!this.broadcastWebSocket||!this.broadcastWebSocket.isOpen) {
this.events.triggerEvent('broadcastFailed');
return;
}
this.broadcastWebSocket.send(JSON.stringify(geoJSONFeature));
this.events.triggerEvent('broadcastSucceeded');
}
/**
* @function DataFlowService.prototype.initSubscribe
* @description 初始化订阅数据。
* @returns {DataFlowService} DataFlowService 的实例对象。
*/
initSubscribe() {
var me = this;
this.subscribeWebSocket = this._connect(Util.urlPathAppend(me.url, 'subscribe'));
this.subscribeWebSocket.onopen = function (e) {
me.subscribeWebSocket.send(me._getFilterParams());
e.eventType = 'subscribeSocketConnected';
me.events.triggerEvent('subscribeSocketConnected', e);
};
this.subscribeWebSocket.onclose = function (e) {
e.eventType = 'subscribeWebSocketClosed';
me.events.triggerEvent('subscribeWebSocketClosed', e);
};
this.subscribeWebSocket.onerror = function (e) {
e.eventType = 'subscribeSocketError';
me.events.triggerEvent('subscribeSocketError', e);
};
this.subscribeWebSocket.onmessage = function (e) {
me._onMessage(e);
};
return this;
}
/**
* @function DataFlowService.prototype.setExcludeField
* @description 设置过滤字段。传入此参数，接收到的信息将不包含过滤掉的字段。
* @param {Object} excludeField - 过滤字段。
* @returns {DataFlowService} DataFlowService 的实例对象。
*/
setExcludeField(excludeField) {
this.excludeField = excludeField;
this.subscribeWebSocket.send(this._getFilterParams());
return this;
}
/**
* @function DataFlowService.prototype.setGeometry
* @description 设置空间范围，只有在该范围内的要素才能被接收。
* @param {GeoJSONObject} geometry - 空间范围。
* @returns {DataFlowService} DataFlowService 的实例对象。
*/
setGeometry(geometry) {
this.geometry = geometry;
this.subscribeWebSocket.send(this._getFilterParams());
return this;
}
/**
* @function DataFlowService.prototype.unSubscribe
* @description 结束订阅数据。
*/
unSubscribe() {
if (!this.subscribeWebSocket) {
return;
}
this.subscribeWebSocket.close();
this.subscribeWebSocket = null;
}
/**
* @function DataFlowService.prototype.unBroadcast
* @description 结束加载广播。
*/
unBroadcast() {
if (!this.broadcastWebSocket) {
return;
}
this.broadcastWebSocket.close();
this.broadcastWebSocket = null;
}
/**
* @function DataFlowService.prototype.destroy
* @override
*/
destroy() {
CommonServiceBase.prototype.destroy.apply(this, arguments);
var me = this;
me.geometry = null;
me.prjCoordSys = null;
me.excludeField = null;
this.unBroadcast();
this.unSubscribe();
}
_getFilterParams() {
var filter = {
filterParam: {
prjCoordSys: this.prjCoordSys,
excludeField: this.excludeField,
geometry: this.geometry
}
};
return Util.toJSON(filter);
}
_onMessage(e) {
if (e.data && e.data.indexOf("filterParam") >= 0) {
var filterParam = JSON.parse(e.data);
e.filterParam = filterParam;
e.eventType = 'setFilterParamSucceeded';
this.events.triggerEvent('setFilterParamSucceeded', e);
return;
}
var feature = JSON.parse(e.data);
e.featureResult = feature;
e.eventType = 'messageSucceeded';
this.events.triggerEvent('messageSucceeded', e);
}
_connect(url) {
url = SecurityManager.appendCredential(url);
if ("WebSocket" in window) {
return new WebSocket(url);
} else if ("MozWebSocket" in window) {
var mozWebSocket = window.MozWebSocket;
return new mozWebSocket(url);
} else {
console.log("no WebSocket");
return null;
}
}
}
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