[No op] Refactor entityLoaderTask to use a helper class #2907
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📝 Walkthrough📝 WalkthroughWalkthroughThe changes introduced in this pull request involve the addition of a new class, In Sequence Diagram(s)sequenceDiagram
participant User
participant EntityLoaderTask
participant EntityLoaderHelper
participant EntityFactory
User->>EntityLoaderTask: Start loading entities
EntityLoaderTask->>EntityLoaderHelper: Initialize with Detail and EvaluationContext
EntityLoaderTask->>EntityLoaderHelper: Call loadEntities(nodeset)
EntityLoaderHelper->>EntityFactory: Expand references
EntityFactory-->>EntityLoaderHelper: Return expanded references
EntityLoaderHelper->>EntityLoaderHelper: Load entities with references
EntityLoaderHelper-->>EntityLoaderTask: Return loaded entities and references
EntityLoaderTask-->>User: Complete loading entities
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Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
app/src/org/commcare/tasks/EntityLoaderHelper.kt (1)
16-76: Consider using Kotlin coroutines for improved cancellation handlingThe class currently implements
Cancellableand uses astopLoadingflag to handle cancellation. Kotlin coroutines provide a more idiomatic way to handle asynchronous operations and cancellation. By using coroutines, you can simplify the code, improve readability, and leverage structured concurrency for better cancellation support.
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app/src/org/commcare/tasks/EntityLoaderHelper.kt(1 hunks)app/src/org/commcare/tasks/EntityLoaderTask.java(3 hunks)
| val entities = loadEntitiesWithReferences(references) | ||
| factory.prepareEntities(entities) | ||
| factory.printAndClearTraces("build") | ||
| return Pair<List<Entity<TreeReference>>, List<TreeReference>>(entities, references) |
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Handle possible null return value from loadEntitiesWithReferences to prevent NullPointerException
The method loadEntitiesWithReferences can return null if stopLoading is true. However, in loadEntities, there is no check for entities being null before calling factory.prepareEntities(entities) and factory.printAndClearTraces("build"). This could lead to a NullPointerException if entities is null.
Apply this diff to add a null check:
fun loadEntities(nodeset: TreeReference): Pair<List<Entity<TreeReference>>, List<TreeReference>>? {
val references = factory.expandReferenceList(nodeset)
val entities = loadEntitiesWithReferences(references)
+ if (entities == null) {
+ return null
+ }
factory.prepareEntities(entities)
factory.printAndClearTraces("build")
return Pair(entities, references)
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| val entities = loadEntitiesWithReferences(references) | |
| factory.prepareEntities(entities) | |
| factory.printAndClearTraces("build") | |
| return Pair<List<Entity<TreeReference>>, List<TreeReference>>(entities, references) | |
| val entities = loadEntitiesWithReferences(references) | |
| if (entities == null) { | |
| return null | |
| } | |
| factory.prepareEntities(entities) | |
| factory.printAndClearTraces("build") | |
| return Pair<List<Entity<TreeReference>>, List<TreeReference>>(entities, references) |
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (1)
app/src/org/commcare/tasks/EntityLoaderHelper.kt (1)
56-74: Consider optimizing ArrayList initializationThe ArrayList is initialized without an initial capacity, which could lead to multiple resizing operations. Consider initializing with the size of references:
- val entities: MutableList<Entity<TreeReference>> = ArrayList() + val entities: MutableList<Entity<TreeReference>> = ArrayList(references.size)
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📒 Files selected for processing (2)
app/src/org/commcare/tasks/EntityLoaderHelper.kt(1 hunks)app/src/org/commcare/tasks/EntityLoaderTask.java(3 hunks)
🔇 Additional comments (7)
app/src/org/commcare/tasks/EntityLoaderHelper.kt (3)
16-24: Well-structured class declaration with appropriate property scoping
Good implementation of the Cancellable interface and proper property visibility modifiers.
41-50: LGTM! Good use of Kotlin null safety features
The implementation properly handles null cases and clearly separates the loading and preparation steps.
25-36: Verify lifecycle management of HereFunctionHandler
Adding the function handler to evalCtx could potentially cause memory leaks if the handler holds references to the activity. Consider using a weak reference or ensuring proper cleanup.
app/src/org/commcare/tasks/EntityLoaderTask.java (4)
27-27: LGTM! Good encapsulation of helper functionality
The field is properly marked as final and follows good encapsulation practices.
37-37: LGTM! Clean delegation to helper while maintaining error handling
The refactoring successfully simplifies the implementation while preserving proper error handling.
110-114: LGTM! Proper cancellation handling
Good implementation of onCancelled that properly propagates cancellation to the helper.
62-64: 🛠️ Refactor suggestion
Consider adding error feedback for null result
The current implementation silently returns on null result. Consider providing feedback to the listener about the cancellation or failure:
if (result == null) {
+ listener.deliverLoadError(new Exception("Entity loading was cancelled or failed"));
return;
}Likely invalid or redundant comment.
Summary
Decouples async wireframing from the actual code to load entities using a helper.
PR Checklist
Automated test coverage
We have a couple instrumantation tests that tests basic working of case lists - CaseListSearchTest.kt and CaseListSortTest.kt
Safety story
It's a no-op refactor and only moves code to the helper class without introducing any changes to functionality. The moved code is migrated to Kotlin which has potential to introduce regression although it being a very core workflow, I am quite sure any regressions here would be very visible in our automated testing.