#130 redux refactor (#208)

* mocks for redux refactor - for discussion * more API design on redux refactor * add new reuqired dependencies for build * change babel target to use modern browser * remove dead code * remove dead code - joy plots * checkpoint on redux refactoring * checkpoint on redux refactoring * fix mistaken rebase conflict resolution * dead code removal; add name to dataframe backmap * rename dataframe to universe * update eslint config to more closely match prettier * lint * more eslint updates to match prettier * additional config to make eslint match prettier * add expression data to Universe/World * remove obsolete reducers * lint fixes * more eslint cleanup * lint * lint * fix but in countAllOnes when dimensions gt 1 * lint; do not display name metadata field * lint; colors refactor * lint; colors refactor * update comments * first cut at regraph and reset * enable object-curly-braces consistent mode * lint, handle regraph with no selection * fix expression scatterplot bugs * fix regression legend display * add expression data cache * remove console logging * reset cell color on regraph/reset * remove obsolete server URLs * rename UniverseV01 to Universe_REST_API_v01 * add additional comments on the varDataCache * merge universe reducer into controls reducer; simplify initialization-related actions * use spread operator * fix erroneous comment * convert universe and world state to plain objects, and functionalize supporting code (remove ES6 classes) * use spread operator * lint * improve variable names * rename obsCrossfilter to crossfilter and obsDimensionMap to dimensionMap * rename controls2 to controls
2026-09-24 07:18:11 +08:00 · 2018-09-17 20:43:39 -07:00
parent 7b00fea44d
commit d4e850d18f
40 changed files with 2008 additions and 1584 deletions
@@ -0,0 +1,72 @@
+// jshint esversion: 6
+import _ from "lodash";
+
+/*
+Very simple key/value cache for use by World & Universe.
+
+  * constructor(lowWatermark, cachekey):
+      - lowWatermark defines the number of cache elements below which
+        flushing will not occur.
+      - minTTL defines minimum time in MS that cache entries will live.
+        A value of -1 disables automatic flushing (flush() can still
+        be called by external user).
+      - cachekey is a key that will be assigned to any value to track age
+  * set() - add a key/val pair.
+  * get() - get a value or undefined if not present.
+  * flush(minAgeMs) - flush cache entries in excess of lowWatermark if those
+    entries are older than minAgeMs.
+
+*/
+
+const cachePrivateKey = "__kvcachekey__";
+
+function create(lowWatermark = 32, minTTL = 1000) {
+  return {
+    [cachePrivateKey]: {
+      lowWatermark,
+      minTTL
+    }
+  };
+}
+
+function get(kvcache, key) {
+  const val = kvcache[key];
+  if (val) {
+    val[cachePrivateKey] = Date.now();
+  }
+  return val;
+}
+
+function set(kvcache, key, val) {
+  const newKvCache = { ...kvcache };
+  newKvCache[key] = val;
+  val[cachePrivateKey] = Date.now();
+  flush(newKvCache, newKvCache[cachePrivateKey].minTTL);
+  return newKvCache;
+}
+
+/*
+Flush elements from cache IF cache size is greater than lowWatermark, and
+those elements are older than minAgeMS
+*/
+function flush(kvcache, minAgeMs = 0) {
+  if (minAgeMs < 0) return kvcache;
+  const eol = Date.now() - minAgeMs;
+  const { lowWatermark } = kvcache[cachePrivateKey];
+  const keys = _(kvcache)
+    .keys()
+    .filter(k => k !== cachePrivateKey)
+    .filter(k => kvcache[k][cachePrivateKey] < eol)
+    .sortBy([k => kvcache[k][cachePrivateKey]])
+    .value();
+
+  if (keys.length > lowWatermark) {
+    const numKeysToDelete = keys.length - lowWatermark;
+    const keysToDelete = _.slice(keys, 0, numKeysToDelete);
+    _.forEach(keysToDelete, k => delete kvcache[k]);
+  }
+
+  return kvcache;
+}
+
+export { create, get, set, flush };