feat: disable button while file is being downloaded #129
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WalkthroughThe recent updates introduce new callback mechanisms and state management to the Changes
Sequence Diagram(s)sequenceDiagram
participant U as User
participant G as GridExporter
participant C as ConcurrentStreamResourceWriter
participant D as Document
U->>G: Request document export
G->>C: Initialize export process
C->>D: Generate document stream
D-->>C: Return document stream
C->>C: onAccept() callback
C->>U: Provide document stream
U->>C: Acknowledge download completion
C->>C: onFinish() callback
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Actionable comments posted: 7
Outside diff range and nitpick comments (2)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2)
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41-62: Refactor test methods to improve clarity and maintainability.Consider breaking down complex test methods into smaller, more focused tests. This can improve readability and make it easier to identify the specific conditions each test is verifying.
Line range hint
41-62: Optimize synchronization mechanisms in test setup.Evaluate the use of
CountDownLatchandCyclicBarrierfor efficiency and correctness. Ensure that they are used in a way that accurately simulates the intended concurrency scenarios.
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Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (3)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (4 hunks)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (4 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2 hunks)
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Learnings (2)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (1)
User: javier-godoy PR: FlowingCode/GridExporterAddon#125 File: src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java:338-402 Timestamp: 2024-06-09T06:20:09.702Z Learning: Zero or negative costs in the `setConcurrentDownloadCost` method do not require any permits, allowing such downloads to bypass the semaphore mechanism.src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (1)
User: javier-godoy PR: FlowingCode/GridExporterAddon#125 File: src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java:338-402 Timestamp: 2024-06-09T06:20:09.702Z Learning: Zero or negative costs in the `setConcurrentDownloadCost` method do not require any permits, allowing such downloads to bypass the semaphore mechanism.
| private boolean accepted; | ||
| private boolean finished; |
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Ensure proper encapsulation of state management in ConcurrentStreamResourceWriter.
Consider making the boolean fields private to ensure they are only modified within the class itself, enhancing encapsulation and reducing the risk of unintended side effects from external modifications.
Also applies to: 53-62
src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java
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| /** | ||
| * Callback method that is invoked when a download is accepted. | ||
| * <p> | ||
| * This method is called at the start of the download process, right after the | ||
| * {@link #accept(OutputStream, VaadinSession) accept} method is invoked and it has been | ||
| * determined that the download can proceed. Subclasses should implement this method to perform | ||
| * any necessary actions before the download begins, such as initializing resources, logging, or | ||
| * updating the UI to reflect the start of the download. | ||
| * <p> | ||
| * Note that this method is called before any semaphore permits are acquired, so it is executed | ||
| * regardless of whether the semaphore is enabled or not. | ||
| * </p> | ||
| */ | ||
| protected abstract void onAccept(); | ||
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| /** | ||
| * Callback method that is invoked when a download finishes. | ||
| * <p> | ||
| * This method is called at the end of the download process, right before the | ||
| * {@link #accept(OutputStream, VaadinSession) accept} method returns, regardless of whether the | ||
| * download was successful, timed out, or encountered an error. Subclasses should implement this | ||
| * method to perform any necessary actions after the download completes, such as releasing | ||
| * resources, logging, or updating the UI to reflect the completion of the download. | ||
| * <p> | ||
| * Note that this method is always called, even if an exception is thrown during the download | ||
| * process, ensuring that any necessary cleanup can be performed. | ||
| * </p> | ||
| */ | ||
| protected abstract void onFinish(); | ||
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Ensure correct implementation of callback methods in ConcurrentStreamResourceWriter.
Verify that the onAccept, onFinish, and onTimeout methods are implemented in a way that they correctly handle their respective stages of the download process. These methods should allow for clean separation of concerns and easy maintenance.
| if (!downloading.compareAndSet(false, true)) { | ||
| throw new IllegalStateException(); | ||
| } | ||
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| if (!enabled) { | ||
| delegate.accept(stream, session); | ||
| } else { | ||
| try { | ||
| onAccept(); | ||
| if (!enabled) { | ||
| delegate.accept(stream, session); | ||
| } else { | ||
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| try { | ||
| try { | ||
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| int permits; | ||
| float cost = getCost(session); | ||
| synchronized (semaphore) { | ||
| permits = costToPermits(cost, semaphore.maxPermits); | ||
| } | ||
| int permits; | ||
| float cost = getCost(session); | ||
| synchronized (semaphore) { | ||
| permits = costToPermits(cost, semaphore.maxPermits); | ||
| } | ||
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| if (semaphore.tryAcquire(permits, getTimeout(), TimeUnit.NANOSECONDS)) { | ||
| try { | ||
| delegate.accept(stream, session); | ||
| } finally { | ||
| semaphore.release(permits); | ||
| if (semaphore.tryAcquire(permits, getTimeout(), TimeUnit.NANOSECONDS)) { | ||
| try { | ||
| delegate.accept(stream, session); | ||
| } finally { | ||
| semaphore.release(permits); | ||
| } | ||
| } else { | ||
| onTimeout(); | ||
| throw new InterruptedByTimeoutException(); | ||
| } | ||
| } else { | ||
| onTimeout(); | ||
| throw new InterruptedByTimeoutException(); | ||
| } catch (InterruptedException e) { | ||
| Thread.currentThread().interrupt(); | ||
| throw (IOException) new InterruptedIOException().initCause(e); | ||
| } | ||
| } catch (InterruptedException e) { | ||
| Thread.currentThread().interrupt(); | ||
| throw (IOException) new InterruptedIOException().initCause(e); | ||
| } | ||
| } finally { | ||
| downloading.set(false); | ||
| onFinish(); |
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Review semaphore logic in the accept method for correctness and robustness.
Ensure that the semaphore logic within the accept method is robust and correctly handles different scenarios such as timeouts and interruptions. The method should fail gracefully in case of errors and ensure resources are always released.
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@coderabbitai when would the implementation fail to release resources?
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@javier-godoy, the implementation in the accept method of ConcurrentStreamResourceWriter.java is designed to ensure that resources are always released, regardless of how the method exits. Here's how it handles different scenarios:
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Semaphore Permits: The semaphore permits are acquired conditionally within a nested try block. Regardless of the outcome (successful acquisition or timeout), the permits are released in the finally block associated with this nested try. This ensures that if permits are acquired, they are always released, even if an exception like
InterruptedByTimeoutExceptionis thrown. -
AtomicBoolean
downloading: This flag is set totrueat the beginning of the method and is always set back tofalsein the outer finally block. This ensures that the flag is reset even if an exception occurs during the download process. -
Exception Handling: If an
InterruptedExceptionoccurs, it is caught, and the thread's interrupt status is set again withThread.currentThread().interrupt(), followed by throwing anInterruptedIOException. This is done inside the inner try block, ensuring that all resources are still released properly in the finally blocks.
The method is structured to fail gracefully by ensuring that all resources (semaphore permits and the downloading flag) are cleaned up in the finally blocks, which are always executed regardless of whether an exception occurs. This robust design prevents resource leakage under normal operation conditions. If you have specific scenarios in mind where you suspect resources might not be released, please share them, and I can look into those specifically.
| public GridExporterStreamResource getDocxStreamResource() { | ||
| return getDocxStreamResource(null); | ||
| } | ||
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| public StreamResource getDocxStreamResource(String template) { | ||
| return new StreamResource(fileName + ".docx", | ||
| public GridExporterStreamResource getDocxStreamResource(String template) { | ||
| return new GridExporterStreamResource(fileName + ".docx", | ||
| makeConcurrentWriter(new DocxStreamResourceWriter<>(this, template))); | ||
| } | ||
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| public StreamResource getPdfStreamResource() { | ||
| public GridExporterStreamResource getPdfStreamResource() { | ||
| return getPdfStreamResource(null); | ||
| } | ||
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| public StreamResource getPdfStreamResource(String template) { | ||
| return new StreamResource(fileName + ".pdf", | ||
| public GridExporterStreamResource getPdfStreamResource(String template) { | ||
| return new GridExporterStreamResource(fileName + ".pdf", | ||
| makeConcurrentWriter(new PdfStreamResourceWriter<>(this, template))); | ||
| } | ||
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| public StreamResource getCsvStreamResource() { | ||
| return new StreamResource(fileName + ".csv", new CsvStreamResourceWriter<>(this)); | ||
| } | ||
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| public StreamResource getExcelStreamResource() { | ||
| public GridExporterStreamResource getExcelStreamResource() { | ||
| return getExcelStreamResource(null); | ||
| } | ||
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| public StreamResource getExcelStreamResource(String template) { | ||
| return new StreamResource(fileName + ".xlsx", | ||
| public GridExporterStreamResource getExcelStreamResource(String template) { | ||
| return new GridExporterStreamResource(fileName + ".xlsx", |
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Review new methods for generating stream resources in GridExporter.
Ensure that the methods getDocxStreamResource, getPdfStreamResource, and getExcelStreamResource are correctly implemented. They should integrate seamlessly with the rest of the application and handle all edge cases.
| excelLink | ||
| .setHref(exporter.getExcelStreamResource(excelCustomTemplate) | ||
| .forComponent(excelLink)); | ||
| excelLink.getElement().setAttribute("download", true); | ||
| footerToolbar.add( | ||
| new FooterToolbarItem(excelLink, FooterToolbarItemPosition.EXPORT_BUTTON)); | ||
| } | ||
| if (exporter.isDocxExportEnabled()) { | ||
| Anchor docLink = new Anchor("", FontAwesome.Regular.FILE_WORD.create()); | ||
| docLink.setHref(exporter.getDocxStreamResource(docxCustomTemplate)); | ||
| docLink.setHref( | ||
| exporter.getDocxStreamResource(docxCustomTemplate).forComponent(docLink)); | ||
| docLink.getElement().setAttribute("download", true); | ||
| footerToolbar | ||
| .add(new FooterToolbarItem(docLink, FooterToolbarItemPosition.EXPORT_BUTTON)); | ||
| } | ||
| if (exporter.isPdfExportEnabled()) { | ||
| Anchor docLink = new Anchor("", FontAwesome.Regular.FILE_PDF.create()); | ||
| docLink.setHref(exporter.getPdfStreamResource(docxCustomTemplate)); | ||
| docLink.setHref( | ||
| exporter.getPdfStreamResource(docxCustomTemplate).forComponent(docLink)); |
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Review the integration of UI components and concurrency settings in GridExporter.
Ensure that the integration of UI components with concurrency settings is handled correctly. The methods that configure and manage buttons should work seamlessly with the concurrency logic to provide a consistent user experience.
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@coderabbitai Please explain what you mean
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@javier-godoy, I'd be happy to clarify the integration of UI components with concurrency settings in the GridExporter class.
In the GridExporter class, the integration primarily revolves around managing the UI components, specifically the buttons for exporting documents, in conjunction with the concurrency settings that control the download processes.
Here's a breakdown of how it works:
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UI Component Integration: Each export button (for Excel, DOCX, PDF) is linked to a corresponding
GridExporterStreamResourcevia theforComponent()method. This method associates a button with a specific download action, ensuring that the download is triggered when the button is clicked. -
Concurrency Management: The
GridExporterStreamResourceuses an instance ofGridExporterConcurrentStreamResourceWriterto write the stream. This class extendsConcurrentStreamResourceWriterand is crucial for managing concurrency. It implements methods likeonAccept()andonFinish():onAccept(): Called when a download is initiated. This method disables the associated button to prevent further clicks and thus additional concurrent downloads.onFinish(): Called once the download is complete. This re-enables the button, allowing further actions.
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Concurrency Settings: These settings are configured to manage how downloads are handled when multiple requests are made. For instance, settings like
concurrentDownloadCostandconcurrentDownloadTimeoutNanoshelp in defining the cost of a download and how long the system should wait before timing out a download request, respectively.
The integration ensures that the user experience is smooth and consistent, preventing any issues that might arise from concurrent downloads, such as multiple downloads interfering with each other or overloading the server.
I hope this explanation helps! If you have any more questions or need further details, feel free to ask.
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@coderabbitai You asked to "Review the integration of UI components and concurrency settings in GridExporter and ensure that the integration of UI components with concurrency settings is handled correctly" but according to your explanation, the integration seems correct.
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@javier-godoy, I'm glad to hear that the explanation met your expectations and that the integration of UI components with concurrency settings in the GridExporter class appears correct to you. If you have any more questions, need further clarifications, or if there's anything else I can assist you with, please don't hesitate to ask!
src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java
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Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (4)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (2 hunks)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (6 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/VaadinServiceInitListenerImpl.java (1 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2 hunks)
Additional comments not posted (16)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/VaadinServiceInitListenerImpl.java (1)
23-24: LGTM!The addition of
GridExporter.setDisableOnClick(true)effectively prevents additional downloads from starting while one is already in progress, improving control flow and user experience.src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (3)
160-173: LGTM!The addition of the
onAcceptmethod allows subclasses to perform necessary pre-download actions, enhancing the control flow and logic of the download process.
175-188: LGTM!The addition of the
onFinishmethod allows subclasses to perform necessary post-download actions, ensuring that essential actions are performed consistently.
208-238: LGTM!The modifications to the
acceptmethod ensure that pre-download and post-download actions are executed consistently, improving the robustness of the download handling process.src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2)
53-56: LGTM!The overridden
onAcceptmethod correctly sets theacceptedvariable to true, allowing the class to track the acceptance state of the resource writer.
58-61: LGTM!The overridden
onFinishmethod correctly sets thefinishedvariable to true, allowing the class to track the completion state of the resource writer.src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (10)
24-26: LGTM!The new imports for
ComponentandHasEnabledare necessary for the new functionality.
86-86: LGTM!The new boolean field
disableOnClickis correctly added to control concurrent downloads.
299-300: LGTM!The method
getDocxStreamResourcehas been correctly updated to returnGridExporterStreamResource.
303-304: LGTM!The method
getDocxStreamResource(String template)has been correctly updated to returnGridExporterStreamResource.
308-309: LGTM!The method
getPdfStreamResourcehas been correctly updated to returnGridExporterStreamResource.
312-313: LGTM!The method
getPdfStreamResource(String template)has been correctly updated to returnGridExporterStreamResource.
321-322: LGTM!The method
getExcelStreamResourcehas been correctly updated to returnGridExporterStreamResource.
325-326: LGTM!The method
getExcelStreamResource(String template)has been correctly updated to returnGridExporterStreamResource.
330-333: LGTM!The method
makeConcurrentWriterhas been correctly updated to returnGridExporterConcurrentStreamResourceWriter.
349-395: LGTM!The class
GridExporterConcurrentStreamResourceWriteris correctly implemented to manage concurrent downloads and UI updates.
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Actionable comments posted: 0
Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (5)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (2 hunks)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (6 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/VaadinServiceInitListenerImpl.java (1 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2 hunks)
Files skipped from review due to trivial changes (1)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/VaadinServiceInitListenerImpl.java
Files skipped from review as they are similar to previous changes (1)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java
Additional context used
Learnings (1)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1)
Learnt from: javier-godoy PR: FlowingCode/GridExporterAddon#125 File: src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java:338-402 Timestamp: 2024-06-09T06:20:09.702Z Learning: Zero or negative costs in the `setConcurrentDownloadCost` method do not require any permits, allowing such downloads to bypass the semaphore mechanism.
Additional comments not posted (22)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1)
118-119: LGTM!The change to set the
disableOnClickproperty of theexporterobject totrueimproves the robustness of the download process by preventing multiple concurrent downloads.src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (10)
160-173: LGTM!The
onAcceptmethod is correctly defined as an abstract method, allowing subclasses to implement necessary actions before the download begins.
175-188: LGTM!The
onFinishmethod is correctly defined as an abstract method, allowing subclasses to implement necessary actions after the download completes.
208-209: LGTM!The call to
onAcceptensures that any pre-download logic is executed before the semaphore permits are acquired.
237-238: LGTM!The call to
onFinishensures that any post-download actions are executed regardless of whether an exception occurs during the download process.
Line range hint
374-377: LGTM!The
onTimeoutmethod is correctly defined as an abstract method, allowing subclasses to implement necessary actions in response to the timeout.
229-230: LGTM!The call to
onTimeoutensures that any necessary actions in response to the timeout are executed.
208-209: LGTM!The call to
onAcceptensures that any pre-download logic is executed before the semaphore permits are acquired.
237-238: LGTM!The call to
onFinishensures that any post-download actions are executed regardless of whether an exception occurs during the download process.
229-230: LGTM!The call to
onTimeoutensures that any necessary actions in response to the timeout are executed.
208-209: LGTM!The calls to
onAcceptandonFinishensure that any pre-download and post-download actions are executed correctly.Also applies to: 237-238
src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (11)
86-86: LGTM!The
disableOnClickfield is correctly defined and initialized.
299-299: LGTM!The update to the
getDocxStreamResourcemethod signature is correctly applied and aligns with the new resource management strategy.
303-304: LGTM!The update to the
getDocxStreamResource(String template)method signature is correctly applied and aligns with the new resource management strategy.
308-308: LGTM!The update to the
getPdfStreamResourcemethod signature is correctly applied and aligns with the new resource management strategy.
312-313: LGTM!The update to the
getPdfStreamResource(String template)method signature is correctly applied and aligns with the new resource management strategy.
321-321: LGTM!The update to the
getExcelStreamResourcemethod signature is correctly applied and aligns with the new resource management strategy.
325-326: LGTM!The update to the
getExcelStreamResource(String template)method signature is correctly applied and aligns with the new resource management strategy.
330-333: LGTM!The modification of the
makeConcurrentWritermethod to returnGridExporterConcurrentStreamResourceWriteris correctly applied and aligns with the new resource management strategy.
335-347: LGTM!The
GridExporterStreamResourceclass is correctly defined and aligns with the new resource management strategy.
349-395: LGTM!The
GridExporterConcurrentStreamResourceWriterclass is correctly defined and aligns with the new resource management strategy.
494-506: LGTM!The
setDisableOnClickmethod is correctly defined and aligns with the new resource management strategy.
javier-godoy
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Good catch. I reverted that change.
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Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Files selected for processing (4)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java (2 hunks)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (6 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1 hunks)
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java (2 hunks)
Files skipped from review as they are similar to previous changes (2)
- src/main/java/com/flowingcode/vaadin/addons/gridexporter/ConcurrentStreamResourceWriter.java
- src/test/java/com/flowingcode/vaadin/addons/gridexporter/test/ConcurrentExportTests.java
Additional context used
Learnings (1)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1)
Learnt from: javier-godoy PR: FlowingCode/GridExporterAddon#125 File: src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java:338-402 Timestamp: 2024-06-09T06:20:09.702Z Learning: Zero or negative costs in the `setConcurrentDownloadCost` method do not require any permits, allowing such downloads to bypass the semaphore mechanism.
Additional comments not posted (5)
src/test/java/com/flowingcode/vaadin/addons/gridexporter/GridExporterBigDatasetDemo.java (1)
118-119: LGTM!The code changes align with the PR objective of disabling the button while a file is being downloaded. This enhancement prevents users from initiating multiple downloads simultaneously, thereby improving the user experience and increasing the robustness of the download process.
src/main/java/com/flowingcode/vaadin/addons/gridexporter/GridExporter.java (4)
86-86: LGTM!The addition of the
disableOnClickfield is approved. It aligns with the feature of preventing multiple concurrent downloads, as mentioned in the AI-generated summary.
330-333: LGTM!The change to the
makeConcurrentWritermethod to return an instance ofGridExporterConcurrentStreamResourceWriteris approved. It aligns with the introduction of the new class for handling concurrent download operations, as mentioned in the AI-generated summary.
335-396: LGTM!The addition of the
GridExporterStreamResourceandGridExporterConcurrentStreamResourceWriterclasses is approved. The classes align with the AI-generated summary and provide the necessary functionality for managing document export streams and handling concurrent download operations. TheforComponentmethod inGridExporterStreamResourceand the overridden methods inGridExporterConcurrentStreamResourceWriterenable button state management and concurrency control.
494-506: LGTM!The addition of the
setDisableOnClickmethod is approved. It provides a way to configure the behavior of the system when a download is in progress, aligning with the AI-generated summary and the addition of thedisableOnClickfield.
#126
Summary by CodeRabbit
New Features
Bug Fixes
Tests