Hello@msampathkumar, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

Summary of Changes

Hello! Gemini here, providing a summary of this pull request. This PR, titled "feat(genai): Add new GenAI SDK samples (WIP)", aims to introduce a collection of new sample code snippets for the Google Cloud Generative AI Java SDK. These samples demonstrate various functionalities of the SDK, including different input modalities (text, image, video), token counting, streaming responses, function calling, and controlled generation using schemas and system instructions. The PR description indicates this is a work in progress and includes a checklist relevant to adding new samples.

Highlights

• New GenAI Samples: Adds multiple new Java code samples demonstrating how to use the GenAI SDK for various tasks.
• Multi-modal Input: Includes samples showing how to generate content using combinations of text, images (from GCS and local files), and video.
• Token Counting: Provides samples for counting tokens for both text-only and multi-modal (text and video) inputs.
• Advanced Features: Demonstrates features like streaming content generation, function calling with function descriptions, controlled generation using enum schemas, and using system instructions.
• Integration Tests: Adds corresponding integration tests to verify the functionality of the new samples.

Changelog

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Code Review

This pull request introduces several new GenAI SDK samples, which is a valuable addition. The samples cover various functionalities like token counting, content generation with different modalities (text, image, video), streaming, function calling, and system instructions. The code is generally clear and follows a consistent structure for snippets.

I've identified a few areas for improvement, primarily concerning safe handling ofOptional types and the brittleness of some test assertions. Addressing these will enhance the robustness and reliability of the samples and tests.

No specific style guide was provided, so feedback regarding style or maintainability is based on common Java best practices, generally aligned with principles from guides like the Google Java Style Guide.

Summary of Findings

• Unsafe Optional Handling: InGenerateContentWithFunctionDescription.java,Optional<List<FunctionCall>> is accessed without proper checks, potentially leading to runtime exceptions. (Addressed in review comments)
• Brittle Test Assertions: Tests inSnippetsIT.java use hardcoded exact values for token counts, which can make tests fail if underlying models or tokenizers change slightly. (Addressed in review comments)
• Hardcoded Values in Samples: Many samples use hardcoded values formodelId, prompts, GCS URIs, and local file paths (e.g.,CountTokensWithText.java:17,GenerateContentWithTextAndImage.java:29). While theTODO(developer) comments address this, it's a common characteristic of these samples. For production code, these should be configurable. (Not commented directly due to review settings - low severity)
• Unused Imports and Variables: Some files contain unused imports or variables:

• GenerateContentStream.java: Unused importcom.google.genai.types.GenerateContentConfig (line 7).
• SnippetsIT.java: Unused importscom.google.gson.annotations.SerializedName (line 26),java.util.Base64 (line 34).
• SnippetsIT.java: Unused constantsTARGET_LANGUAGE_CODE (line 55),TEXT_TO_TRANSLATE (line 56).
  (Not commented directly due to review settings - low severity)

• Clarity of Output in Samples: Some samples print the entire response object (e.g.,CountTokensWithText.java:36). It might be more illustrative for users if the samples printed specific, relevant fields from the response, aligning with the example output comments. (Not commented directly due to review settings - low severity)
• Handling of Return Values inmain Methods: Themain methods in several snippets call functions that return values, but these return values are not always used or printed bymain. This is generally acceptable for snippets focused onSystem.out.print within the called method. (Not commented directly due to review settings - low severity)
• Potentially Unused/Misconfigured Test Elements: InSnippetsIT.java:

• TheGEMINI_FLASH_1_5 constant (line 51) is identical toGEMINI_FLASH. If a different 1.5 model was intended (e.g., for the commented-out tests), this might be a misconfiguration.
• ThereadImageFile method (line 90) appears unused by the active tests in this file.
  (Not commented directly due to review settings - low severity)

Merge Readiness

The pull request adds useful GenAI SDK samples. However, there are a fewhigh andmedium severity issues related to unsafeOptional handling and brittle test assertions that should be addressed before merging to ensure code correctness and test stability. Other minor points are noted in the summary for future consideration. I am unable to approve pull requests, but I recommend making the suggested changes before this PR is merged by an authorized reviewer.