Allow reset environnement global variable #3
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WalkthroughThis update introduces two main enhancements: a Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Interpreter as Prolog Interpreter
participant VM as Virtual Machine
User->>Interpreter: Call NewEmpty()
Interpreter->>VM: ResetEnv()
VM-->>Interpreter: Environment Reset
Interpreter-->>User: New Empty Interpreter
User->>Interpreter: Call New()
Interpreter->>VM: ResetEnv()
VM-->>Interpreter: Environment Reset
Interpreter->>Interpreter: Setup Input/Output Streams
Interpreter-->>User: New Interpreter with Predicates/Operators
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Actionable comments posted: 1
Outside diff range, codebase verification and nitpick comments (1)
interpreter.go (1)
17-17: Document theInterpreterstruct.The
Interpreterstruct lacks detailed documentation. It's important to explain the purpose and usage of each field and the struct itself, especially in a complex system like a Prolog interpreter.
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Files selected for processing (2)
- engine/vm.go (2 hunks)
- interpreter.go (1 hunks)
Additional context used
golangci-lint
interpreter.go
20-20: field
loadedis unused(unused)
Additional comments not posted (3)
interpreter.go (1)
23-28: Review of the newNewEmptymethod.The
NewEmptymethod correctly initializes a newInterpreterinstance and resets its environment usingResetEnv(). This aligns with the PR's objective to ensure a fresh environment for each interpreter instance.engine/vm.go (2)
9-9: Review of the new importsync/atomic.The addition of
sync/atomicis justified as it is used in theResetEnvmethod to perform atomic operations on global variables. This ensures thread safety in the reset process.
306-317: Review of the newResetEnvmethod.The
ResetEnvmethod correctly uses atomic operations to reset global counters and initializes the root environment. This method is essential for ensuring that global state does not leak between executions in a multi-threaded environment.
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Actionable comments posted: 1
Outside diff range, codebase verification and nitpick comments (1)
interpreter.go (1)
17-17: Maintain theloadedfield despite static analysis flagging it as unused.Based on the learning from previous interactions and the decision to retain the
loadedfield for potential future use, it's appropriate to keep this field. Consider adding a comment in the code to explain why this field is retained, to help future maintainers understand the decision.+ // The `loaded` field is retained for potential future use as per the original design intentions of the library's author. loaded map[string]struct{}
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Files selected for processing (2)
- engine/vm.go (1 hunks)
- interpreter.go (1 hunks)
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Learnings (1)
interpreter.go (1)
Learnt from: bdeneux PR: axone-protocol/prolog#3 File: interpreter.go:20-20 Timestamp: 2024-07-16T12:32:15.725Z Learning: The `loaded` field in the `Interpreter` struct of the `interpreter.go` file is retained despite being currently unused because it was added by the original author of the library and might be used in future updates.
golangci-lint
interpreter.go
20-20: field
loadedis unused(unused)
Additional comments not posted (2)
interpreter.go (2)
23-28: New methodNewEmptyfor creating a Prolog interpreter without predefined predicates/operators.This method effectively resets the environment to ensure a clean state, aligning well with the PR objectives to enhance determinism. The implementation is straightforward and correctly uses the
ResetEnvmethod to clear any existing state before returning the new interpreter instance.
33-33: Modification to theNewmethod to include environment resetting.The addition of
i.ResetEnv()at the beginning of theNewmethod is a significant improvement. It ensures that each new interpreter starts with a clean state, which is crucial for maintaining determinism across different interpreter instances. This change is consistent with the PR objectives and should help in resolving the issues documented in issue #690.
This PR introduces a helper function designed to reset global variables and counters each time a new interpreter instance is created. This approach serves as a temporary solution to address issues related to determinism within the Axone chain, as documented in issue #690.
To integrate this solution, modifications are required within the chain to leverage the newly introduced
NewEmpty()method of the interpreter. This method ensures a clean state for each interpreter instantiation.Alternative Approach
An alternative strategy was initially considered, which involved relocating the variable counter into the VM itself. This modification would necessitate passing a reference to the VM to the
NewVariable()method. However, this approach would have significant implications for the existing codebase, requiring extensive refactoring to propagate the VM reference throughout the various levels of the VM interpreter. Given the substantial changes and potential complexity this would introduce, the current solution was preferred for its simplicity and minimal impact on the existing architecture. A branch with a starting point has been created : main...axone-protocol:prolog:fix/remove-global-counter