63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
var _ = require('underscore');
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var dot = require('dot');
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var NamedMapMapConfigProvider = require('../models/mapconfig/named_map_provider');
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var templateName = require('../backends/template_maps').templateName;
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var LruCache = require("lru-cache");
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function NamedMapProviderCache(templateMaps, pgConnection, userLimitsApi, queryTablesApi) {
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this.templateMaps = templateMaps;
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this.pgConnection = pgConnection;
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this.userLimitsApi = userLimitsApi;
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this.queryTablesApi = queryTablesApi;
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this.providerCache = new LruCache({ max: 2000 });
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}
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module.exports = NamedMapProviderCache;
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NamedMapProviderCache.prototype.get = function(user, templateId, config, authToken, params) {
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var namedMapKey = createNamedMapKey(user, templateId);
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var namedMapProviders = this.providerCache.get(namedMapKey) || {};
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var providerKey = createProviderKey(config, authToken, params);
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if (!namedMapProviders.hasOwnProperty(providerKey)) {
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namedMapProviders[providerKey] = new NamedMapMapConfigProvider(
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this.templateMaps,
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this.pgConnection,
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this.userLimitsApi,
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this.queryTablesApi,
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user,
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templateId,
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config,
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authToken,
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params
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);
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this.providerCache.set(namedMapKey, namedMapProviders);
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}
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return namedMapProviders[providerKey];
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};
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NamedMapProviderCache.prototype.invalidate = function(user, templateId) {
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this.providerCache.del(createNamedMapKey(user, templateId));
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};
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function createNamedMapKey(user, templateId) {
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return user + ':' + templateName(templateId);
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}
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var providerKey = '{{=it.authToken}}:{{=it.configHash}}:{{=it.format}}:{{=it.layer}}:{{=it.scale_factor}}';
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var providerKeyTpl = dot.template(providerKey);
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function createProviderKey(config, authToken, params) {
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var tplValues = _.defaults({}, params, {
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authToken: authToken || '',
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configHash: NamedMapMapConfigProvider.configHash(config),
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layer: '',
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format: '',
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scale_factor: 1
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});
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return providerKeyTpl(tplValues);
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}
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