From 12e95c9eafd4b519e098e6e950958a4924184493 Mon Sep 17 00:00:00 2001
From: Pranav Sharma <sharmapranav@google.com>
Date: Tue, 16 Apr 2024 22:31:51 +0000
Subject: [PATCH] Switch to ConcurrentMap for thread-safety

---
 .../cloud/opentelemetry/detection/GCPMetadataConfig.java      | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detection/GCPMetadataConfig.java b/detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detection/GCPMetadataConfig.java
index 09cf39f4..a11384b5 100644
--- a/detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detection/GCPMetadataConfig.java
+++ b/detectors/resources-support/src/main/java/com/google/cloud/opentelemetry/detection/GCPMetadataConfig.java
@@ -22,8 +22,8 @@
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
-import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Retrieves Google Cloud project-id and a limited set of instance attributes from Metadata server.
@@ -36,7 +36,7 @@ final class GCPMetadataConfig {
 
   private static final String DEFAULT_URL = "http://metadata.google.internal/computeMetadata/v1/";
   private final String url;
-  private final Map<String, String> cachedAttributes = new HashMap<>();
+  private final Map<String, String> cachedAttributes = new ConcurrentHashMap<>();
 
   private GCPMetadataConfig() {
     this.url = DEFAULT_URL;