fix: Do not leak TFile in Fair{File,Mixed}Source

[ChristianTackeGSI]

• feature: Introduce maybe_owning_ptr #1442

And refactor into FairFileSourceBase.

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Checklist:

• Followed the Contributing Guidelines

Summary by CodeRabbit

• New Features

  • Improved memory management for file handling using smart pointers, enhancing application stability and reducing memory leaks.
  • Added error handling for file operations, providing more robust and reliable file management.

• Bug Fixes

  • Addressed issues related to file pointer initialization and management, ensuring consistent and error-free file handling.

• Refactor

  • Updated internal file management to use std::unique_ptr for better ownership semantics and memory safety.
  • Removed obsolete methods and variables related to file handling, streamlining the codebase.

[coderabbitai]

Walkthrough

Walkthrough

The changes primarily enhance memory management in the FairFileSource and FairMixedSource classes by replacing raw pointers with std::unique_ptr for TFile instances. This ensures better ownership semantics and reduces the risk of memory leaks. Additionally, helper classes like maybe_owning_ptr are introduced for flexible ownership handling. The modifications also include error handling improvements and the removal of some methods and member variables.

Changes

Files	Change Summary
fairroot/base/source/FairFileSource.cxx, fairroot/base/source/FairFileSource.h	Replaced raw TFile pointers with std::unique_ptr, removed GetRootFile() method and fRootFile member variable.
fairroot/base/source/FairFileSourceBase.cxx, fairroot/base/source/FairFileSourceBase.h	Introduced maybe_owning_ptr for fRootFile, added GetInFile() and GetRootFile() methods, improved error handling.
fairroot/base/source/FairMixedSource.cxx, fairroot/base/source/FairMixedSource.h	Converted fRootFile to std::unique_ptr, removed GetRootFile() method, updated constructors and methods to use std::unique_ptr for TFile objects.

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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 336d0b6 and 3385d5e.

Files selected for processing (6)

• fairroot/base/source/FairFileSource.cxx (11 hunks)
• fairroot/base/source/FairFileSource.h (4 hunks)
• fairroot/base/source/FairFileSourceBase.cxx (2 hunks)
• fairroot/base/source/FairFileSourceBase.h (3 hunks)
• fairroot/base/source/FairMixedSource.cxx (10 hunks)
• fairroot/base/source/FairMixedSource.h (3 hunks)

Files skipped from review as they are similar to previous changes (4)

• fairroot/base/source/FairFileSource.h
• fairroot/base/source/FairFileSourceBase.h
• fairroot/base/source/FairMixedSource.cxx
• fairroot/base/source/FairMixedSource.h

Additional comments not posted (5)

fairroot/base/source/FairFileSourceBase.cxx (1)

20-26: The constructor's use of maybe_owning_ptr for TFile and the robust error handling for file validity are excellent improvements.

fairroot/base/source/FairFileSource.cxx (4)

45-49: Initialization of FairFileSourceBase with maybe_owning_ptr clearly defines the ownership semantics, which is a good practice.

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82-82: Using std::unique_ptr for file management in the constructor enhances safety by ensuring proper resource deallocation.

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115-115: Consistent use of std::unique_ptr across constructors ensures robust resource management.

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565-566: The update to SetInputFile with std::unique_ptr and enhanced error handling significantly improves the robustness of file operations.

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[coderabbitai]

Actionable comments posted: 4

[fuhlig1]

Looks okay.