Substitute Clock for Reactive Application Debugging
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Solution Overview
Problem
Debugging reactive applications becomes increasingly complex as the number of components increases, often resulting in false timeouts during debugging due to the suspension of execution by debuggers, which can mask actual errors.
Innovation Solution
A system that replaces the system clock of a reactive application with a substitute clock, pausing and resuming it to avoid or intentionally cause timeouts, allowing for precise control and error identification during debugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a debugger suspends execution of a reactive application during debugging, then developers can inspect execution states, but false timeouts occur due to the suspension masking actual errors
Solution Approach 1:
The patent introduces a substitute clock as an intermediary between the debugger and the reactive application's system clock. This substitute clock allows the debugger to suspend execution without affecting the application's timeout mechanisms, as the substitute clock continues to advance independently. This resolves the contradiction by mediating between the debugging suspension requirement and the timeout accuracy requirement.
Solution Approach 2:
The patent segments the clocking function into two independent components: the debugger's execution control (suspend/resume) and the application's timeout mechanism (substitute clock). By separating these functions, the debugger can suspend execution for inspection while the substitute clock continues to track time for timeout operations, preventing false timeouts while maintaining debugging accuracy.
2Adaptability or versatility
If the number of components in a system increases, then the system can perform more tasks cooperatively, but debugging complexity increases
Solution Approach 1:
The substitute clock acts as a mediator that simplifies debugging in multi-component systems by providing a unified time-tracking mechanism that is independent of execution suspension. This allows developers to debug complex multi-component reactive applications without the confusion of false timeouts, effectively reducing debugging complexity while maintaining system versatility.
3Reliability
If the system clock is replaced with a substitute clock during debugging suspension, then false timeouts are prevented, but additional system complexity is introduced
Solution Approach 1:
The patent creates a copy of the clocking function through the substitute clock, which replicates the time-tracking behavior needed for timeout operations. This copy is simpler to manage during debugging than the original system clock, as it can be independently controlled and does not require actual time passage. The substitute clock copying approach prevents false timeouts while adding minimal complexity to the debugger.
Data Source
AI summary
A debugger executes on a computer system to receive a first debugging command from a client, where the first debugging command sets a first instruction in the reactive application to suspend execution of the reactive application, and where during execution of the reactive application the first instruction is triggered which suspends execution of the reactive application. Responsive to the execution of the reactive application being suspended, a system clock of the reactive application is replaced with a substitute clock and the substitute clock is paused. The debugger then receives a second debugging command, where the second debugging command triggers a second instruction in the reactive application to continue execution of the reactive application. Responsive to the execution of the reactive application being continued, clocking of the substitute clock is continued.