bdelacretaz commented on a change in pull request #17:
URL: 
https://github.com/apache/sling-org-apache-sling-graphql-core/pull/17#discussion_r562644983



##########
File path: 
src/main/java/org/apache/sling/graphql/core/engine/DefaultQueryExecutor.java
##########
@@ -289,4 +332,71 @@ private String getDirectiveArgumentValue(Directive d, 
String name) {
             throw up;
         }
     }
+
+    GraphQLSchema getSchema(@NotNull String sdl, @NotNull Resource 
currentResource, @NotNull String[] selectors) {
+        readLock.lock();
+        String newHash = SHA256Hasher.getHash(sdl);
+        String resourceToHashMapKey = getCacheKey(currentResource, selectors);
+        String oldHash = resourceToHashMap.get(resourceToHashMapKey);

Review comment:
       might be good to add a comment about why you're using a composite cache 
key, that was initially unclear to me. IIUC that's because buildWiring uses the 
Resource and the services that it uses can changes outside of our control.




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