annotate src/implab/data/RestStore.js @ 18:efefacae534f

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author andrei
date Tue, 03 Oct 2017 21:11:56 +0300
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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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f0035923ff3e добавлена библиотека для работы с openlayers 3+
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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 itemsType : null,
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14
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15 _dataContext : null,
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16
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17 _store : null, // backing store
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18 _cache : null,
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19
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20 constructor : function(options) {
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21 options = options || {};
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22
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23 this._cache = {};
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24 if (options.store)
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25 this._store = options.store;
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26 if (options.dataContext)
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27 this._dataContext = options.dataContext;
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28 },
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29
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30 setDataContext : function(v) {
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31 this._dataContext = v;
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32 },
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33
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34 getDataContext : function() {
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35 return this._dataContext;
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36 },
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37
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38 // READ
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39 get : function(id) {
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40 var me = this;
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41 var cache = me.getCacheEntry(id);
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42 if (cache)
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43 return cache;
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44 else
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45 return when(me._store.get(id), function(data) {
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46 return me._mapToObject(id, data);
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47 });
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48 },
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49
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50 query : function(query, options) {
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51 var me = this;
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52 var d = me._store.query(query, options);
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53 var result = QueryResults(when(d, function(data) {
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54 return array.map(data, function(item) {
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55 return me._mapToObject(me._store.getIdentity(item), item);
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56 });
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57 }));
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58 result.total = d.total;
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59 return result;
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60 },
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61
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62 getIdentity : function(object) {
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63 return object.getId();
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64 },
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65
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66 // UPDATE
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67 put : function(object, directives) {
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68 return this._store.put(this._mapFromObject(object), directives);
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69 },
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70
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71 // INSERT
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72 add : function(object, directives) {
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73 var me = this;
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74 // добавляем в хранилище данные, сохраняем в кеше объект с
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75 // полученным идентификатором
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76 return when(
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77 me._store.add(this._mapFromObject(object), directives),
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78 function(id) {
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79 object.attach(id, me);
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80 me.storeCacheEntry(id, object);
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81 return id;
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82 });
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83 },
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84
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85 // DELETE
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86 remove : function(id) {
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87 var me = this;
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88 return when(me._store.remove(id), function() {
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89 me.removeCacheEntry(id);
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90 });
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91 },
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92
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93 _mapToObject : function(id, data) {
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94 var instance = this.createInstance(id);
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95 this.populateInstance(instance, data);
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96 return instance;
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97 },
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98
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99 _mapFromObject : function(object) {
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100 return this.serializeInstance(object);
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101 },
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102
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103 getCacheEntry : function(id) {
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104 safe.argumentNotNull(id, "id");
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105 id = id.toString();
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106
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107 return this._cache[id];
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108 },
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109
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110 storeCacheEntry : function(id, object) {
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111 safe.argumentNotNull(id, "id");
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112 id = id.toString();
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113
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114 this._cache[id] = object;
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115 },
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116
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117 removeCacheEntry : function(id) {
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118 safe.argumentNotNull(id, "id");
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119 id = id.toString();
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120 delete this._cache[id];
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121 },
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122
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123 /** Создает экземпляр сущности с указанным идентификатором, либо извлекает из кеша, если таковая уже имеется.
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124 * @remarks
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125 * Технически сюда можно было бы дополнительно передать данные для ининциализации объекта,
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126 * но концептуально это не верно, поскольку процесс чтения объекта состоит из двух этапов:
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127 * 1. Создание пустого объекта (createInstance)
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128 * 2. Заполнение объекта при помощи схемы отображения (populateInstance)
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129 * при этом первый этап может быть выполнен за долго до второго, например,
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130 * при создании заглушек в процессе установления ссылок между объектами.
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131 */
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132 createInstance : function(id) {
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133 var instance = this.getCacheEntry(id);
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134 if (!instance) {
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135 instance = this.createInstanceImpl(id);
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136 this.storeCacheEntry(id, instance);
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137 }
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138 return instance;
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139 },
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140
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141 /** Непосредственно создает экземпляр сущнсти, т.е. является фабричным методом.
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142 * @param {String} id идентификатор создаваемого экземпляра.
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143 */
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144 createInstanceImpl : function(id) {
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145 var opts = {
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146 dataContext : this.getDataContext(),
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147 id : id
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148 };
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149
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150 return new this.itemsType(opts);
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151 },
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152
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153 populateInstance : function(instance, data) {
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154 this.itemsType.readData(instance, data,this.getDataContext());
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155 if (instance.onPopulate)
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156 instance.onPopulate();
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157 },
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158
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159 serializeInstance : function(instance) {
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160 var data = {};
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161 this.itemsType.writeData(instance, data, this.getDataContext());
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162 return data;
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163 }
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164
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165 });
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166 });