From 8dcf526de10798ec37db28b0d370e270f16d5b63 Mon Sep 17 00:00:00 2001
From: querwurzel <>
Date: Fri, 10 May 2024 19:14:57 +0200
Subject: [PATCH] support multiple fulltext search implementations

---
 .../paste/domain/MySqlFullTextSupport.java    |  2 ++
 .../domain/PasteRepositoryCustomImpl.java     | 26 +++++++++++--------
 .../paste/domain/SimpleFullTextSupport.java   |  3 ++-
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/backend/src/main/java/com/github/binpastes/paste/domain/MySqlFullTextSupport.java b/backend/src/main/java/com/github/binpastes/paste/domain/MySqlFullTextSupport.java
index 361db388..fdbfad19 100644
--- a/backend/src/main/java/com/github/binpastes/paste/domain/MySqlFullTextSupport.java
+++ b/backend/src/main/java/com/github/binpastes/paste/domain/MySqlFullTextSupport.java
@@ -2,6 +2,7 @@
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Profile;
+import org.springframework.core.annotation.Order;
 import org.springframework.data.r2dbc.core.R2dbcEntityTemplate;
 import org.springframework.stereotype.Component;
 import reactor.core.publisher.Flux;
@@ -14,6 +15,7 @@
 
 @Profile("mysql")
 @Component
+@Order(0)
 class MySqlFullTextSupport implements FullTextSearchSupport {
 
     private final R2dbcEntityTemplate entityTemplate;
diff --git a/backend/src/main/java/com/github/binpastes/paste/domain/PasteRepositoryCustomImpl.java b/backend/src/main/java/com/github/binpastes/paste/domain/PasteRepositoryCustomImpl.java
index 369fa694..96708c00 100644
--- a/backend/src/main/java/com/github/binpastes/paste/domain/PasteRepositoryCustomImpl.java
+++ b/backend/src/main/java/com/github/binpastes/paste/domain/PasteRepositoryCustomImpl.java
@@ -27,7 +27,7 @@ class PasteRepositoryCustomImpl implements PasteRepositoryCustom {
     private final List<FullTextSearchSupport> fullTextSearchSupport;
 
     public PasteRepositoryCustomImpl(R2dbcEntityTemplate entityManager, List<FullTextSearchSupport> fullTextSearchSupport) {
-        Assert.isTrue(fullTextSearchSupport.size() <= 2, "Expected at most two FullTextSearchSupport implementations"); // ugly, but works for now
+        Assert.notEmpty(fullTextSearchSupport, "Require at least one FullTextSearchSupport implementation");
         this.entityTemplate = entityManager;
         this.fullTextSearchSupport = fullTextSearchSupport;
     }
@@ -79,15 +79,19 @@ public Mono<Long> markExpiredPastesForDeletion() {
 
     @Override
     public Flux<Paste> searchAllLegitByFullText(String text) {
-        var flux = fullTextSearchSupport.getFirst().searchByFullText(text);
-
-        return fullTextSearchSupport.size() == 1
-                ? flux
-                : flux.switchIfEmpty(subscriber -> {
-                    log.warn("Fulltext search found nothing for: {}", text);
-                    fullTextSearchSupport.getLast()
-                            .searchByFullText(text)
-                            .subscribe(subscriber);
-                });
+        var result = fullTextSearchSupport.getFirst().searchByFullText(text);
+
+        for (int idx = 1; idx < fullTextSearchSupport.size(); idx++) {
+            final var alternativeImplementation = fullTextSearchSupport.get(idx);
+
+            result = result.switchIfEmpty(subscriber -> {
+                log.warn("Utilising alternative FullTextSearch implementation {} for: {}", alternativeImplementation.getClass().getSimpleName(), text);
+                alternativeImplementation
+                        .searchByFullText(text)
+                        .subscribe(subscriber);
+            });
+        }
+
+        return result;
     }
 }
diff --git a/backend/src/main/java/com/github/binpastes/paste/domain/SimpleFullTextSupport.java b/backend/src/main/java/com/github/binpastes/paste/domain/SimpleFullTextSupport.java
index 6df7b179..8bdd8e28 100644
--- a/backend/src/main/java/com/github/binpastes/paste/domain/SimpleFullTextSupport.java
+++ b/backend/src/main/java/com/github/binpastes/paste/domain/SimpleFullTextSupport.java
@@ -1,6 +1,7 @@
 package com.github.binpastes.paste.domain;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.r2dbc.core.R2dbcEntityTemplate;
@@ -15,7 +16,7 @@
 import static com.github.binpastes.paste.domain.Paste.PasteSchema;
 
 @Component
-@Order
+@Order(Ordered.LOWEST_PRECEDENCE)
 class SimpleFullTextSupport implements FullTextSearchSupport {
 
     private final R2dbcEntityTemplate entityTemplate;