From 3308e68edf9992318ec309b210de91830a9f2ad3 Mon Sep 17 00:00:00 2001
From: Debanjum Singh Solanky <debanjum@gmail.com>
Date: Sun, 4 Sep 2022 02:21:10 +0300
Subject: [PATCH] Cache explicitly filtered entries, embeddings by required,
 blocked words

---
 src/search_filter/explicit_filter.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/search_filter/explicit_filter.py b/src/search_filter/explicit_filter.py
index e3b5bb9f..2707155b 100644
--- a/src/search_filter/explicit_filter.py
+++ b/src/search_filter/explicit_filter.py
@@ -25,6 +25,7 @@ class ExplicitFilter:
         self.entry_key = entry_key
         self.search_type = search_type
         self.entries_by_word_set = None
+        self.cache = {}
 
 
     def load(self, entries, regenerate=False):
@@ -36,6 +37,7 @@ class ExplicitFilter:
             logger.debug(f"Load {self.search_type} entries by word set from file: {end - start} seconds")
         else:
             start = time.time()
+            self.cache = {}  # Clear cache on (re-)generating entries_by_word_set
             entry_splitter = r',|\.| |\]|\[\(|\)|\{|\}|\t|\n|\:'
             self.entries_by_word_set = [set(word.lower()
                                     for word
@@ -72,6 +74,13 @@ class ExplicitFilter:
         logger.debug(f"Extract required, blocked filters from query: {end - start} seconds")
 
         if len(required_words) == 0 and len(blocked_words) == 0:
+            return query, raw_entries, raw_embeddings
+
+        # Return item from cache if exists
+        cache_key = tuple(sorted(required_words)), tuple(sorted(blocked_words))
+        if cache_key in self.cache:
+            logger.info(f"Explicit filter results from cache")
+            entries, embeddings = self.cache[cache_key]
             return query, entries, embeddings
 
         if not self.entries_by_word_set:
@@ -103,4 +112,7 @@ class ExplicitFilter:
         end = time.time()
         logger.debug(f"Delete entries not satisfying filter: {end - start} seconds")
 
+        # Cache results
+        self.cache[cache_key] = entries, embeddings
+
         return query, entries, embeddings