annotate src/implab/data/ObjectStore.js @ 17:9c21e656cbec

Разработка кнопки выбора координат с карт
author nickolay
date Tue, 19 Sep 2017 20:37:56 +0300
parents f0035923ff3e
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1 define([ "dojo/_base/declare", "dojo/_base/lang", "dojo/_base/array",
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2 "../safe", "dojo/when", "dojo/Deferred", "dojo/store/util/QueryResults" ], function(declare,
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3 lang, array, safe, when, Deferred, QueryResults) {
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4 /**
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5 * @module implab/data/RestStore
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6 *
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7 * Реализует шаблон репозитария dojo/store над уже имеющимся хранилищем. При получении и
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8 * отправке данных в нижележащие хранилище используется implab/data/MapSchema для преобразования
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9 * данных.
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10 */
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11 return declare(null, {
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12
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13 model: null,
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14
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15 mapping: null,
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16
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17 _dataContext: null,
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18
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19 _store : null, // backing store
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20
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21 _cache : null,
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22
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23 constructor : function(options) {
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24 options = options || {};
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25
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26 if (options.store)
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27 this._store = options.store;
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28
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29 if (options.dataContext) {
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30 this._dataContext = options.dataContext;
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31 }
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32
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33 if (options.cache === false) {
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34 // no cache at all
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35 } else if (options.cache === "string" && options.dataContext) {
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36 this._cache = this._dataContext.getCache(options.cache);
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37 } else {
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38 this._cache = {};
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39 }
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40 },
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41
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42 getDataContext : function() {
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43 return this._dataContext;
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44 },
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45
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46 // READ
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47 get : function(id) {
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48 var me = this;
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49 var cache = me.getCacheEntry(id);
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50 if (cache)
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51 return cache;
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52 else
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53 return when(me._store.get(id), function(data) {
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54 return me._mapToObject(id, data);
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55 });
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56 },
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57
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58 query : function(query, options) {
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59 var me = this;
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60 var d = me._store.query(query, options);
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61 var result = QueryResults(when(d, function(data) {
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62 return array.map(data, function(item) {
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63 return me._mapToObject(me._store.getIdentity(item), item);
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64 });
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65 }));
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66 result.total = d.total;
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67 return result;
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68 },
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69
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70 getIdentity : function(object) {
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71 return object.getId();
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72 },
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73
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74 // UPDATE
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75 put : function(object, directives) {
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76 return this._store.put(this._mapFromObject(object), directives);
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77 },
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78
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79 // INSERT
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80 add : function(object, directives) {
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81 var me = this;
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82 // добавляем в хранилище данные, сохраняем в кеше объект с
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83 // полученным идентификатором
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84 return when(
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85 me._store.add(this._mapFromObject(object), directives),
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86 function(id) {
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87 object.attach(id, me);
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88 me.storeCacheEntry(id, object);
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89 return id;
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90 });
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91 },
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92
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93 // DELETE
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94 remove : function(id) {
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95 var me = this;
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96 return when(me._store.remove(id), function() {
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97 me.removeCacheEntry(id);
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98 });
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99 },
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100
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101 _mapToObject : function(id, data) {
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102 var instance = this.createInstance(id);
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103 this.populateInstance(instance, data);
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104 return instance;
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105 },
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106
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107 _mapFromObject : function(object) {
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108 return this.serializeInstance(object);
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109 },
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110
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111 getCacheEntry : function(id) {
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112 safe.argumentNotNull(id, "id");
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113 id = id.toString();
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114
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115 return this._cache[id];
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116 },
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117
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118 storeCacheEntry : function(id, object) {
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119 safe.argumentNotNull(id, "id");
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120 id = id.toString();
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121
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122 this._cache[id] = object;
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123 },
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124
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125 removeCacheEntry : function(id) {
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126 safe.argumentNotNull(id, "id");
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127 id = id.toString();
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128 delete this._cache[id];
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129 },
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130
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131 /** Создает экземпляр сущности с указанным идентификатором, либо извлекает из кеша, если таковая уже имеется.
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132 * @remarks
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133 * Технически сюда можно было бы дополнительно передать данные для ининциализации объекта,
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134 * но концептуально это не верно, поскольку процесс чтения объекта состоит из двух этапов:
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135 * 1. Создание пустого объекта (createInstance)
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136 * 2. Заполнение объекта при помощи схемы отображения (populateInstance)
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137 * при этом первый этап может быть выполнен за долго до второго, например,
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138 * при создании заглушек в процессе установления ссылок между объектами.
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139 */
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140 createInstance : function(id) {
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141 var instance = this.getCacheEntry(id);
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142 if (!instance) {
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143 instance = this.createInstanceImpl(id);
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144 this.storeCacheEntry(id, instance);
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145 }
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146 return instance;
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147 },
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148
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149 /** Непосредственно создает экземпляр сущнсти, т.е. является фабричным методом.
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150 * @param {String} id идентификатор создаваемого экземпляра.
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151 */
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152 createInstanceImpl : function(id) {
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153 var opts = {
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154 dataContext : this.getDataContext(),
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155 id : id
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156 };
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157
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158 return new this.itemsType(opts);
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159 },
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160
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161 populateInstance : function(instance, data) {
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162 this.mapping.readData(instance, data,this.getDataContext());
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163 if (instance.onPopulate)
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164 instance.onPopulate();
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165 },
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166
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167 serializeInstance : function(instance) {
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168 var data = {};
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169 this.mapping.writeData(instance, data, this.getDataContext());
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170 return data;
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171 }
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172
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173 });
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174 });