From cc691bade836d27d02bb2330f0fa323a1d88a1bb Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 7 Nov 2026 22:35:21 +0100
Subject: inspect: the paths changes touch

document::inspect: each change's paths read from its operations before
it is applied, the same on every node: an object's place as made, cut
at lists and text; unknown objects at the root.

Auth plan M6.
---
 src/document/bench.rs | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

(limited to 'src/document/bench.rs')

diff --git a/src/document/bench.rs b/src/document/bench.rs
index 1bb13ee..bc1f6fa 100644
--- a/src/document/bench.rs
+++ b/src/document/bench.rs
@@ -25,7 +25,10 @@
 //! the change left it (`store::changed_by`, so every node finds the same paths). Against
 //! receiving a sync message of many changes and loading a document of many changes, as
 //! above, each change writing a value three levels deep; and decoding alone, the part
-//! that grows with the change rather than with its objects.
+//! that grows with the change rather than with its objects. Decoded as the document
+//! rebuilds them, and from the bytes they came as; and inspected before they are
+//! applied (`inspect::Inspector`), their objects made among them or looked up in the
+//! document, each once.
 
 use std::time::{Duration, Instant};
 
@@ -509,6 +512,36 @@ fn path_costs(workload: &str, base: Duration, doc: &Document) {
         }
         started.elapsed()
     });
+    // Before they are applied (`inspect::Inspector`): those of a sync message to a node
+    // that has none of them, their objects made among them; those of a document loaded,
+    // looked up in it.
+    let inspected = median(3, || {
+        let empty = Document::new();
+        let started = Instant::now();
+        let changes: Vec<automerge::ExpandedChange> = raw
+            .iter()
+            .map(|(_, bytes)| {
+                automerge::Change::from_bytes(bytes.clone())
+                    .expect("change")
+                    .decode()
+            })
+            .collect();
+        std::hint::black_box(super::inspect::Inspector::new(&empty).paths(&changes));
+        started.elapsed()
+    });
+    let looked_up = median(3, || {
+        let started = Instant::now();
+        let changes: Vec<automerge::ExpandedChange> = raw
+            .iter()
+            .map(|(_, bytes)| {
+                automerge::Change::from_bytes(bytes.clone())
+                    .expect("change")
+                    .decode()
+            })
+            .collect();
+        std::hint::black_box(super::inspect::Inspector::new(doc).paths(&changes));
+        started.elapsed()
+    });
     report_signatures(
         workload,
         base,
@@ -517,6 +550,8 @@ fn path_costs(workload: &str, base: Duration, doc: &Document) {
             ("paths", paths),
             ("from bytes: decoding", decode_bytes),
             ("paths", paths_bytes),
+            ("inspected, made among them", inspected),
+            ("looked up", looked_up),
         ],
     );
 }
-- 
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