46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
var queue = require('queue-async');
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function LayerStats(layerStatsIterator) {
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this.layerStatsIterator = layerStatsIterator;
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}
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LayerStats.prototype.getStats = function (mapConfig, dbConnection, callback) {
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var self = this;
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var stats = [];
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if (!mapConfig.getLayers().length) {
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return callback(null, stats);
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}
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var metaQueue = queue(mapConfig.getLayers().length);
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mapConfig.getLayers().forEach(function (layer, layerId) {
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var layerType = mapConfig.layerType(layerId);
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for (var i = 0; i < self.layerStatsIterator.length; i++) {
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if (self.layerStatsIterator[i].is(layerType)) {
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var getStats = self.layerStatsIterator[i].getStats.bind(self.layerStatsIterator[i]);
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metaQueue.defer(getStats, layer, dbConnection);
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break;
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}
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}
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});
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metaQueue.awaitAll(function (err, results) {
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if (err) {
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return callback(err);
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}
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if (!results) {
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return callback(null, null);
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}
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mapConfig.getLayers().forEach(function (layer, layerIndex) {
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stats[layerIndex] = results[layerIndex];
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});
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return callback(err, stats);
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});
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};
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module.exports = LayerStats;
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