Optimize GC usage of iterating over all elements of GroupedLists when we don't care about the group structure, and simplify the logic for prefetching old deps.
PiperOrigin-RevId: 187681887
diff --git a/src/main/java/com/google/devtools/build/skyframe/QueryableGraph.java b/src/main/java/com/google/devtools/build/skyframe/QueryableGraph.java
index 26422dd..8c5af09 100644
--- a/src/main/java/com/google/devtools/build/skyframe/QueryableGraph.java
+++ b/src/main/java/com/google/devtools/build/skyframe/QueryableGraph.java
@@ -50,6 +50,15 @@
throws InterruptedException;
/**
+ * A prefetch call may be used to hint to the graph that we may call {@link #getBatch} on the
+ * specified keys later.
+ */
+ default void prefetchBatch(
+ @Nullable SkyKey requestor, Reason reason, Iterable<? extends SkyKey> keys) {
+ // Do nothing.
+ }
+
+ /**
* Examines all the given keys. Returns an iterable of keys whose corresponding nodes are
* currently available to be fetched.
*
