Fix incorrect tree snapshot encoding/decoding #198
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WalkthroughThe recent changes enhance the Changes
Sequence Diagram(s) (Beta)sequenceDiagram
participant User
participant Converter
participant Tree
participant Node
User ->> Converter: Call toCrdtTreeRootNode()
Converter ->> Node: Call updateDescendantSize()
Node -->> Converter: Return updated size
Converter ->> Tree: Return updated root
Tree -->> User: Return final tree
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Review details
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Files selected for processing (5)
- yorkie/src/main/kotlin/dev/yorkie/api/ElementConverter.kt (3 hunks)
- yorkie/src/main/kotlin/dev/yorkie/document/crdt/CrdtTree.kt (4 hunks)
- yorkie/src/main/kotlin/dev/yorkie/util/IndexTree.kt (5 hunks)
- yorkie/src/main/kotlin/dev/yorkie/util/IndexTreeExtensions.kt (1 hunks)
- yorkie/src/test/kotlin/dev/yorkie/api/ConverterTest.kt (4 hunks)
Additional comments not posted (13)
yorkie/src/main/kotlin/dev/yorkie/util/IndexTreeExtensions.kt (1)
14-23: The newtraverseAllfunction is a recursive traversal that includes all children, not just the active ones. This is a significant change as it affects how the tree is traversed, potentially including nodes that were previously ignored due to their state (e.g., deleted nodes still present as tombstones). Ensure that this broader traversal does not introduce side effects in contexts where only active nodes should be considered.Verification successful
The
traverseAllfunction is used in several contexts across the codebase. Here are the key observations:
ElementConverter.kt:
traverseAllis used to convertCrdtTreeNodetoPBTreeNode. This context seems to require all nodes, including tombstones, to ensure a complete conversion.IndexTree.kt:
- The function is documented to traverse the whole tree, including tombstones, which aligns with the intended broader traversal.
CrdtTree.kt:
traverseAllis used to populatenodeMapByIDand handle node insertion during concurrent editing. Both usages seem to require awareness of all nodes, including tombstones.Given these contexts, the broader traversal introduced by
traverseAllappears to be intentional and necessary for the correct functioning of the code. Therefore, the change does not introduce unintended side effects.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify that the new `traverseAll` function is used correctly across the codebase. # Test: Search for the function usage. Expect: Only occurances where all children need to be considered. rg --type kotlin $'traverseAll'Length of output: 950
Script:
#!/bin/bash # Extract lines around the usage of traverseAll in ElementConverter.kt rg --context 5 --type kotlin 'traverseAll' yorkie/src/main/kotlin/dev/yorkie/api/ElementConverter.kt # Extract lines around the usage of traverseAll in IndexTree.kt rg --context 5 --type kotlin 'traverseAll' yorkie/src/main/kotlin/dev/yorkie/util/IndexTree.kt # Extract lines around the usage of traverseAll in CrdtTree.kt rg --context 5 --type kotlin 'traverseAll' yorkie/src/main/kotlin/dev/yorkie/document/crdt/CrdtTree.ktLength of output: 2599
yorkie/src/test/kotlin/dev/yorkie/api/ConverterTest.kt (3)
Line range hint
7-31: The addition of numerous imports related to theDocumentand JSON handling indicates an expansion in the test's scope to cover more complex scenarios involving document manipulation and JSON operations. This is a positive change as it enhances the test coverage for the serialization and deserialization processes which are critical for the correct functioning of the system.
51-51: The import ofrunTestfromkotlinx.coroutines.testis crucial for writing tests that involve coroutines. This allows for the proper handling of suspending functions within test cases, ensuring that asynchronous operations are completed before assertions are made. Good addition for robust asynchronous testing.
421-444: The new test methodshould encode and decode tree properlyis a critical addition, ensuring that the tree structures are correctly handled through serialization and deserialization processes. This test is essential for validating the integrity of the tree data across different states of the application. It's well-structured to cover various aspects of tree manipulation and state verification.yorkie/src/main/kotlin/dev/yorkie/util/IndexTree.kt (2)
141-146: The addition of thetraverseAllmethod inIndexTreecomplements the similar function inIndexTreeExtensions. This method ensures that the entire tree, including nodes that might be in a tombstone state, is traversed. This is particularly useful for operations that need a complete view of the tree, such as debugging or logging. However, ensure that this method is used in contexts where such a complete traversal is actually required.
Line range hint
432-457: TheupdateDescendantSizemethod is a crucial addition for maintaining the correct size metadata within tree nodes. This method recursively updates the size of a node based on the size of its descendants, which is essential for operations that depend on node sizes, such as rendering or certain algorithms that operate on the tree. Ensure that this method is called at appropriate times to keep the size data accurate.yorkie/src/main/kotlin/dev/yorkie/api/ElementConverter.kt (3)
51-51: Updated import fromtraversetotraverseAllaligns with the new traversal method introduced in other parts of the codebase.
227-227: AddingupdateDescendantSize()before returning the root ensures that the tree's size metadata is accurate and up-to-date, which is crucial for the correct functioning of tree operations that depend on this metadata.
319-319: The use oftraverseAllintoPBTreeNodesensures that all nodes are processed, which is necessary for the correct serialization of the tree structure. This change supports the new traversal logic and is consistent with modifications in related parts of the codebase.
[APROVED]yorkie/src/main/kotlin/dev/yorkie/document/crdt/CrdtTree.kt (4)
3-3: ImportingVisibleForTestingis a good practice as it clearly indicates that certain elements of the code are intended for testing purposes only, which helps maintain the separation between production and test code.
19-19: The import oftraverseAllis necessary due to the removal of thetraverseAllfunction from this file, as indicated in the summary. This change ensures that the functionality can still be accessed through the utility class.
51-51: The initialization block now populatesnodeMapByIDusingtraverseAll, which ensures that all nodes are included. This is crucial for operations that need to access nodes directly by ID, such as deletions or updates.
59-62: The introduction of thenodeSizeproperty with the@VisibleForTestingannotation helps in writing tests that need to verify the correctness of tree modifications affecting the node count. This is a useful addition for ensuring the robustness of tree operations through unit tests.
What this PR does / why we need it?
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What are the relevant tickets?
Fixes #
Checklist
Summary by CodeRabbit
New Features
traverseAllmethod for more efficient postorder traversal.updateDescendantSizemethod.Tests
Refactor
traversefunction withtraverseAllfor better performance and consistency across the codebase.