From db901c07f0aa76b3d9d01c730771b62fb0755f89 Mon Sep 17 00:00:00 2001
From: Brandon Fergerson <bfergerson@apache.org>
Date: Thu, 2 Mar 2023 00:08:30 +0400
Subject: [PATCH] fix: sourceplusplus/sourceplusplus#939

---
 .../spp/jetbrains/marker/service/SourceGuideProvider.kt   | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/marker/src/main/kotlin/spp/jetbrains/marker/service/SourceGuideProvider.kt b/marker/src/main/kotlin/spp/jetbrains/marker/service/SourceGuideProvider.kt
index 2e7c6603f..c6cce3e90 100644
--- a/marker/src/main/kotlin/spp/jetbrains/marker/service/SourceGuideProvider.kt
+++ b/marker/src/main/kotlin/spp/jetbrains/marker/service/SourceGuideProvider.kt
@@ -22,6 +22,7 @@ import com.intellij.openapi.diagnostic.logger
 import spp.jetbrains.marker.service.define.AbstractSourceGuideProvider
 import spp.jetbrains.marker.source.SourceFileMarker
 import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CopyOnWriteArrayList
 
 /**
  * todo: description.
@@ -32,15 +33,14 @@ import java.util.concurrent.ConcurrentHashMap
 object SourceGuideProvider : AbstractSourceGuideProvider {
 
     private val log = logger<SourceGuideProvider>()
-    private val providers = ConcurrentHashMap<String, MutableList<AbstractSourceGuideProvider>>()
+    private val providers = ConcurrentHashMap<String, CopyOnWriteArrayList<AbstractSourceGuideProvider>>()
 
     fun addProvider(guideProvider: AbstractSourceGuideProvider, language: String, vararg languages: String) {
-        providers.computeIfAbsent(language) { mutableListOf() }.add(guideProvider)
-        languages.forEach { providers.computeIfAbsent(it) { mutableListOf() }.add(guideProvider) }
+        addProvider(guideProvider, listOf(language, *languages))
     }
 
     fun addProvider(guideProvider: AbstractSourceGuideProvider, languages: List<String>) {
-        languages.forEach { providers.computeIfAbsent(it) { mutableListOf() }.add(guideProvider) }
+        languages.forEach { providers.computeIfAbsent(it) { CopyOnWriteArrayList() }.add(guideProvider) }
     }
 
     private fun getProvider(language: String): AbstractSourceGuideProvider? {