Feature: Robust service provider loading

[infeo]

Closes #26.

This PR improves discovery and loading of supported service providers by catching common exceptions/errors during this process (ExceptionInInitializationError, NoClassDefFoundError, RuntimeException).

If one of those throwables are thrown, the service provider is considered as "not supported" and filtered out.

Summary by CodeRabbit

• Refactor
  • Improved service provider instantiation and error handling in the integration loader.
• Tests
  • Added tests to verify the handling of exceptions in service provider availability checks.

[coderabbitai]

Walkthrough

The changes focus on enhancing the resilience of the IntegrationsLoader in handling service loading failures. By refining the loading process, the updates ensure that an exception thrown by one service does not prevent the loading of others. This includes the introduction of a method for more robust service provider instantiation, improved error logging, and specific test cases to verify the behavior when exceptions are encountered.

Changes

File Path	Change Summary
.../common/IntegrationsLoader.java	Added ServiceConfigurationError handling, new instantiateServiceProvider method, and improved error logging.
.../common/IntegrationsLoaderTest.java	Added tests for handling exceptions in @CheckAvailability methods.
.../common/InitExceptionTestClass.java	New file for testing initialization exceptions.

Assessment against linked issues

Objective	Addressed	Explanation
Increase resilience against service loading failure (#26)	✅

Poem

In the code where services dwell,
A rabbit worked, casting its spell.
With a hop and a leap, no error too steep,
It weaved resilience, so deep.

"Fear not," it squeaked, with a twinkle in eye,
"For your services, no longer will sigh.
Through storms and errors, they'll stand tall,
United we code, we'll never fall."

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[coderabbitai]

Review Status

Actionable comments generated: 2

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 261b915 and 2da2da6.

Files selected for processing (2)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java (3 hunks)
• src/test/java/org/cryptomator/integrations/common/IntegrationsLoaderTest.java (2 hunks)

Additional comments: 6

src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java (5)

• 12-12: The addition of java.util.Objects import is appropriate for the use of Objects::nonNull in the stream operation to filter out null instances of service providers. This ensures that only successfully instantiated service providers are considered for further processing.
• 14-14: The addition of java.util.ServiceConfigurationError import supports the new exception handling logic within the instantiateServiceProvider method. This is crucial for catching errors related to service provider configuration issues, aligning with the PR's objective to enhance resilience in the service loading process.
• 52-53: The use of map to instantiate service providers followed by filter(Objects::nonNull) is a good practice. It ensures that any service provider that fails to instantiate and returns null is excluded from further processing. This approach contributes to the robustness of the service loading mechanism.
• 89-94: The handling of ExceptionInInitializerError, NoClassDefFoundError, and RuntimeException in passesStaticAvailabilityCheck method is a significant improvement. It ensures that any issues encountered during the static availability check of a service provider do not cause the entire loading process to fail. Logging the warning with the specific service provider's name provides valuable debugging information.
• 99-104: Similar to the static availability check, the instance availability check method passesInstanceAvailabilityCheck also appropriately handles RuntimeException. This consistent approach in handling exceptions across both static and instance checks contributes to the overall robustness of the service loading mechanism.

src/test/java/org/cryptomator/integrations/common/IntegrationsLoaderTest.java (1)

• 206-223: The addition of the testPassesAvailabilityCheckThrowing test method in the InstanceAvailabilityChecks nested class is crucial for ensuring that the IntegrationsLoader correctly handles exceptions thrown by instance methods annotated with @CheckAvailability. This test method complements the static checks by covering instance method scenarios, thereby ensuring comprehensive testing of the new functionality. The inclusion of different classes (C1 and C2) to test various exception scenarios is a good practice.

This test method effectively validates that the service loading process is resilient to exceptions thrown during the availability checks of service providers, aligning with the PR's objectives.

[coderabbitai]

Review Status

Actionable comments generated: 1

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 2da2da6 and 5c92b3a.

Files selected for processing (1)

• src/test/java/org/cryptomator/integrations/common/InitExceptionTestClass.java (1 hunks)

Additional comments: 2

src/test/java/org/cryptomator/integrations/common/InitExceptionTestClass.java (2)

• 8-10: The static block intentionally throws a RuntimeException to simulate a failure during class initialization. This approach is effective for testing the system's behavior in the face of initialization errors. Ensure that this behavior aligns with the testing framework's capabilities and that the exception is handled or expected in test cases to avoid unintended test failures.
• 20-23: The test() method is annotated with @CheckAvailability, which suggests it plays a role in determining the class's availability or readiness. Given the context of this class being used for testing exception handling during initialization, this method's implementation and annotation usage seem appropriate. However, ensure that the annotation's behavior is well-documented and understood within the broader system.

[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 5c92b3a and 9718afc.

Files selected for processing (1)

• src/test/java/org/cryptomator/integrations/common/InitExceptionTestClass.java (1 hunks)

Files skipped from review as they are similar to previous changes (1)

• src/test/java/org/cryptomator/integrations/common/InitExceptionTestClass.java

[overheadhunter]

I'm not too happy with ServiceLoader.Provider#get throwing an Error instead of an Exception. But since we can't change this, I'm ok with this approach.

[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 9718afc and 0e61467.

Files selected for processing (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java (3 hunks)

Files skipped from review as they are similar to previous changes (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java

[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 0e61467 and 1fa0066.

Files selected for processing (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java (3 hunks)

Files skipped from review as they are similar to previous changes (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java

[coderabbitai]

Review Status

Actionable comments generated: 0

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between 1fa0066 and bbd8616.

Files selected for processing (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java (4 hunks)

Files skipped from review as they are similar to previous changes (1)

• src/main/java/org/cryptomator/integrations/common/IntegrationsLoader.java