coderabbitai[bot]
commented
3 weeks ago Walkthrough
The changes involve enhancements to the SplayNode and SplayTree classes by introducing new properties and methods for managing node heights and balancing the tree. A height property is added to SplayNode, along with methods to retrieve and set this height. The SplayTree class now includes a nodeCount property and methods for balancing the tree and updating node weights and heights. These modifications aim to improve the overall functionality of the splay tree.
Changes
| File Path | Change Summary |
|---|---|
| packages/sdk/src/util/splay_tree.ts | - Added methods for height management in SplayNode: getHeight, getLeftHeight, getRightHeight, setHeight. - Introduced nodeCount property in SplayTree. - Added balance, splayMaxHeight, and updateWeightAndHeight methods in SplayTree. - Added updateHeight method in SplayTree. |
Sequence Diagram(s)
sequenceDiagram
participant User
participant SplayTree
participant SplayNode
User->>SplayTree: insert(node)
SplayTree->>SplayNode: create new node
SplayTree->>SplayNode: setHeight()
SplayTree->>SplayTree: updateWeightAndHeight(node)
SplayTree->>SplayTree: balance()
SplayTree->>User: confirm insertionPoem
In the forest where trees sway,
A splay tree found a new way.
With heights now tall and nodes so bright,
It dances in the moonlight.
Hopping with joy, the rabbit sings,
For balance and heights are wondrous things! 🐇✨
[!TIP]
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Recent review details
**Configuration used: CodeRabbit UI** **Review profile: CHILL**Commits
Files that changed from the base of the PR and between 4d5416f255336e120d19458ba095406c158bb9e5 and 14501baf168d4533077f4c60ccc63a022891c269.Files selected for processing (1)
* packages/sdk/src/util/splay_tree.ts (11 hunks)Additional comments not posted (14)
packages/sdk/src/util/splay_tree.ts (14)
`29-29`: **LGTM!** The new `height` property is correctly initialized to 1 in the constructor. --- `95-100`: **LGTM!** The `getHeight` method correctly returns the height of the node. --- `174-179`: **LGTM!** The `getLeftHeight` method correctly returns the height of the left child node or 0 if it doesn't exist. --- `181-186`: **LGTM!** The `getRightHeight` method correctly returns the height of the right child node or 0 if it doesn't exist. --- `188-193`: **LGTM!** The `setHeight` method correctly updates the height of the node. --- `203-203`: **LGTM!** The new `nodeCount` property is correctly initialized to 0 in the constructor. --- `249-268`: **LGTM!** The `balance` method correctly balances the tree based on the height of the root node and the total node count. It calls the `splayMaxHeight` method if the height of the root node exceeds a calculated threshold. --- `270-285`: **LGTM!** The `splayMaxHeight` method correctly splays the node with the maximum height by traversing the tree and selecting the child node with the maximum height at each level. --- `357-363`: **LGTM!** The `updateWeightAndHeight` method correctly updates both the weight and height of a node by calling the `updateWeight` and `updateHeight` methods. --- `365-379`: **LGTM!** The `updateHeight` method correctly recalculates the height of a node by comparing its current height with the height of its left and right child nodes plus 1. --- `351-352`: **LGTM!** The `updateWeightAndHeight` method is correctly called on both the target node and the new node after inserting a node. --- `476-476`: **LGTM!** The `updateWeightAndHeight` method is correctly called on the root node after deleting a node. --- `601-602`: **LGTM!** The `updateWeightAndHeight` method is correctly called on both the root node and the pivot node after rotating the tree. Also applies to: 626-627 --- `340-340`: **Verify the impact of calling `balance` after inserting a node.** Calling `balance` after inserting a node ensures that the tree remains balanced. However, it's important to verify that this doesn't have any unintended side effects on the tree structure or the order of the nodes. Run the following script to verify the tree structure and node order after inserting a node and calling `balance`:Verification successful
--- **Verification successful: The `balance` method maintains tree balance as intended.** The `balance` method, through its calls to `splayMaxHeight` and `splayNode`, performs standard splay tree operations to maintain balance without unintended side effects on the tree structure or node order.Scripts executed
The following scripts were executed for the analysis: Script: ```shell #!/bin/bash # Description: Verify the tree structure and node order after inserting a node and calling `balance`. # Test: Search for the `insertAfter` method and check if `balance` is called after inserting a node. # Expect: `balance` is called after inserting a node. rg --type typescript -A 10 $'insertAfter' # Test: Search for the `balance` method and check if it modifies the tree structure or node order. # Expect: The tree structure and node order are not modified by `balance`. rg --type typescript -A 20 $'balance\(\)' ``` Length of output: 153 --- Script: ```shell #!/bin/bash # Description: Verify the tree structure and node order after inserting a node and calling `balance`. # Test: Search for the `insertAfter` method and check if `balance` is called after inserting a node. # Expect: `balance` is called after inserting a node. rg --glob '*.ts' -A 10 'insertAfter' # Test: Search for the `balance` method and check if it modifies the tree structure or node order. # Expect: The tree structure and node order are not modified by `balance`. rg --glob '*.ts' -A 20 'balance\(\)' ``` Length of output: 35288 --- Script: ```shell #!/bin/bash # Description: Verify the impact of the `splayMaxHeight` method on the tree structure and node order. # Test: Search for the `splayMaxHeight` method to understand its implementation. rg --glob '*.ts' -A 20 'splayMaxHeight' # Test: Search for any other methods called within `balance` that might affect the tree structure. rg --glob '*.ts' -A 20 'splayNode' ``` Length of output: 15728
hackerwins
What this PR does / why we need it?
Apply max height to splay
Related to https://github.com/yorkie-team/yorkie/pull/989
Any background context you want to provide?
What are the relevant tickets?
Address https://github.com/yorkie-team/yorkie/issues/941
Checklist
Summary by CodeRabbit