first commit

app/utils/table_cache_factory.js

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+'use strict';
+
+var LRU = require('lru-cache');
+var NoCache = require('./no_cache');
+
+/**
+ * This module abstracts the creation of a tableCache,
+ * depending on the configuration passed along
+ */
+
+function TableCacheFactory() {
+}
+
+module.exports = TableCacheFactory;
+
+TableCacheFactory.prototype.build = function (settings) {
+    var enabled = settings.tableCacheEnabled || false;
+    var tableCache = null;
+
+    if(enabled) {
+        tableCache = LRU({
+            // store no more than these many items in the cache
+            max: settings.tableCacheMax || 8192,
+            // consider entries expired after these many milliseconds (10 minutes by default)
+            maxAge: settings.tableCacheMaxAge || 1000*60*10
+        });
+    } else {
+        tableCache = new NoCache();
+    }
+
+    return tableCache;
+};