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fareenlavji
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Mar 15, 2026
fareenlavji
commented
- Source code files
- Four README file types
- 3 UMLs
📝 WalkthroughSummary by CodeRabbit
WalkthroughAdds a buffered singleton EventLogger, integrates logging into Agent, Technician, and AssemblyTable, replaces hardcoded drone limit with AssemblyTable.MAX_DRONES, and adds a LogAnalyzer utility plus README documentation for logging and metrics (no public API signature removals except added main/getMaxDrones). Changes
Sequence Diagram(s)sequenceDiagram
participant Agent as Agent Thread
participant Table as AssemblyTable (Monitor)
participant Tech as Technician Thread
participant Logger as EventLogger
Agent->>Logger: logEvent(THREAD_START)
Agent->>Agent: select 2 random components
Agent->>Logger: logEvent(COMPONENTS_SELECTED, components)
Agent->>Table: addComponents(c1,c2)
activate Table
Table->>Logger: logEvent(COMPONENTS_ADDED, tableState)
Table->>Table: notifyAll()
deactivate Table
Tech->>Logger: logEvent(THREAD_START)
Tech->>Table: getComponents(myComponent)
activate Table
Table->>Table: canTake(myComponent)
Table->>Logger: logEvent(COMPONENTS_PICKED, details)
Table->>Table: maybe clear & notifyAll()
deactivate Table
Tech->>Logger: logEvent(WORK_START)
Tech->>Tech: simulate assembly (sleep)
Tech->>Logger: logEvent(WORK_END), logEvent(DRONE_ASSEMBLED)
Tech->>Logger: logEvent(RESPONSE_TIME)
Agent->>Logger: logEvent(WORK_START)
Agent->>Agent: simulate production (sleep)
Agent->>Logger: logEvent(WORK_END), logEvent(RESPONSE_TIME)
par Shutdown
Agent->>Logger: logEvent(THREAD_END)
Tech->>Logger: logEvent(THREAD_END)
end
Logger->>Logger: flushToDisk() (daemon)
Estimated code review effort🎯 4 (Complex) | ⏱️ ~75 minutes Possibly related PRs
Poem
🚥 Pre-merge checks | ✅ 1 | ❌ 2❌ Failed checks (2 inconclusive)
✅ Passed checks (1 passed)
✏️ Tip: You can configure your own custom pre-merge checks in the settings. ✨ Finishing Touches
🧪 Generate unit tests (beta)
✨ Simplify code
📝 Coding Plan
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Pull request overview
This PR submits Assignment 04 materials for the drone assembly concurrency system, adding runtime logging, metrics analysis, and accompanying documentation/UML artifacts.
Changes:
- Added an asynchronous, buffered
EventLoggerand integrated event logging/wait markers into the Agent/Technician/AssemblyTable workflow. - Added a
LogAnalyzerto parse run logs and generate ametrics.txtreport (throughput, utilization, response time). - Added documentation (TXT/MD/HTML) and UML diagram images.
Reviewed changes
Copilot reviewed 9 out of 13 changed files in this pull request and generated 10 comments.
Show a summary per file
| File | Description |
|---|---|
| assignment04/Agent.java | Agent thread now logs lifecycle/events, simulates work, and records response-time metrics. |
| assignment04/AssemblyTable.java | Monitor logic updated to emit wait markers, log table state changes, and orchestrate run + analyzer execution. |
| assignment04/Components.java | Uses ThreadLocalRandom for thread-safe random component selection. |
| assignment04/EventLogger.java | New singleton logger with buffered writes and daemon flush thread. |
| assignment04/LogAnalyzer.java | New log parser that computes aggregate + per-thread metrics and writes metrics.txt. |
| assignment04/Technician.java | Technician threads now log lifecycle/events, simulate work, and record response-time metrics. |
| assignment04/documentation/README.txt | Concise run/config/log-format overview. |
| assignment04/documentation/README.md | Extended markdown documentation including mermaid diagrams and run instructions. |
| assignment04/documentation/README.html | Rendered HTML overview linking to UML diagrams. |
| assignment04/umlDiagrams/UML_Class_Diagram.png | Added UML class diagram image. |
| assignment04/umlDiagrams/UML_Sequence_Diagram_No_Loop.png | Added single-cycle sequence diagram image. |
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| while (!canTake(components)) { | ||
| //If MAX_DRONES have been assembled, do not assemble another | ||
| if (this.dronesMade == MAX_DRONES){ return; } | ||
|
|
| logger.waitStart(Thread.currentThread().getName()); | ||
|
|
||
| //Exit if no more drones are required to be assembled | ||
| if (this.dronesMade == MAX_DRONES){ return; } | ||
|
|
||
| try { | ||
| wait(); //Tells agent to wait until notified | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| if (this.dronesMade == 20){ //Will exit if no more drones are required to be assembled | ||
| return; | ||
| logger.waitEnd(Thread.currentThread().getName()); | ||
| } catch (InterruptedException e) { e.printStackTrace(); } |
| * | ||
| * @return dronesMade | ||
| */ | ||
| public int getDronesAssembled(){ |
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 3000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} |
| this.assemblyTable.addComponents(components1, components2); | ||
| logger.logEvent(name, "COMPONENTS_ADDED", | ||
| components1.toString() + ", " + components2.toString()); | ||
|
|
||
| // Sleep for between 0 and 5 seconds before calculating n! | ||
| try { | ||
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 3000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} | ||
|
|
||
| // NEW --> Metric Analysis (Assignment04_Requirement03) | ||
| long endAttempt = System.currentTimeMillis(); | ||
| long responseTime = endAttempt - startAttempt; | ||
| logger.logEventKV(name, "RESPONSE_TIME", "duration", String.valueOf(responseTime)); |
| this.assemblyTable.getComponents(this.components); | ||
|
|
||
| // Sleep for between 0 and 5 seconds before calculating n! | ||
| try { | ||
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 5000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} | ||
|
|
||
| // NEW --> Metric Analysis (Assignment04_Requirement03) | ||
| long endAttempt = System.currentTimeMillis(); | ||
| long responseTime = endAttempt - startAttempt; | ||
| logger.logEventKV(name, "RESPONSE_TIME", "duration", String.valueOf(responseTime)); |
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 5000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} |
| long totalBusy = 0L; | ||
| Long lastBusyStart = null; |
| # DRONE ASSEMBLY LINE — LOGGING & METRICS SYSTEM | ||
| _SYSC3303A • RTConcurrentSys • WINTER2026 • Assignment04_ | ||
|
|
||
| ## 1. Simplified Deliverable Requirements | ||
| The system extends the classic **Agent–Technician–Monitor** drone‑assembly concurrency problem by adding: | ||
| - A **daemonized EventLogger** (buffered, asynchronous) | ||
| - A **run‑ID log file** per execution (`assembly_log_YYYYMMDD_HHMMSS.txt`) | ||
| - A **concurrency‑safe measurement layer** that captures: | ||
| - Wait times (`WAIT_START`, `WAIT_END`) | ||
| - Work durations (`WORK_START`, `WORK_END`) | ||
| - Response times (`RESPONSE_TIME`) | ||
| - Throughput + utilization | ||
| - A fully automated **LogAnalyzer** that computes: | ||
| - Total drones assembled | ||
| - Total run time | ||
| - Drones per second | ||
| - Per‑thread waiting time and utilization | ||
| - Average response time | ||
|
|
||
| ### 1.1. Agent (Producer Thread) | ||
| - Randomly selects **two distinct components** | ||
| - Requests placement onto `AssemblyTable` |
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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Actionable comments posted: 10
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@assignment04/Agent.java`:
- Around line 61-66: The catch block in Agent.java currently swallows
InterruptedException; update it to restore the thread's interrupt status and
stop/return from the current work iteration. Replace the empty catch with code
that calls Thread.currentThread().interrupt() and then either return from the
method or break out of the work loop (whichever fits the surrounding logic in
the Agent class/run method) so the interruption is propagated and the thread can
shut down gracefully; keep the logger.logEvent(name, "WORK_END") handling
consistent if needed.
In `@assignment04/AssemblyTable.java`:
- Around line 20-21: Make SIZE a class-level constant like MAX_DRONES by
changing its declaration to static final; update the field named SIZE in
AssemblyTable (currently "private final int SIZE = 2;") to "private static final
int SIZE = 2" so it becomes a compile-time constant shared across instances and
consistent with MAX_DRONES.
- Around line 118-122: The catch block swallowing InterruptedException loses the
thread's interrupted status; update the catch for InterruptedException (around
the Thread.sleep call that logs WORK_START/WORK_END and uses logger.logEvent) to
restore the interrupt by calling Thread.currentThread().interrupt() (and
optionally log the interruption via logger.logEvent or logger.error) so the
interruption is propagated correctly.
- Around line 62-65: The catch block that swallows InterruptedException in
AssemblyTable.java (surrounding Thread.sleep(...) and logger.logEvent calls)
should restore the thread's interrupted status instead of being empty; update
the catch (InterruptedException e) { ... } to call
Thread.currentThread().interrupt() (and optionally log the interruption via
logger.logEvent or logger.error) so higher-level code can detect the
interruption while keeping the existing logger.logEvent and Thread.sleep usage
intact.
- Around line 213-218: The current single try/catch around agent.join(),
techFrame.join(), techProp.join(), techCtrl.join() can abort joining remaining
threads if an InterruptedException occurs; change this to handle each join
individually (e.g., wrap each join call for agent, techFrame, techProp, techCtrl
in its own try/catch and/or loop to retry until joined) and if interrupted
restore the interrupt flag with Thread.currentThread().interrupt() so
logger.stop() is not called before all threads are joined; ensure every target
thread is attempted to be joined regardless of interruptions.
- Around line 37-47: The code logs logger.waitStart(...) then may return early
when this.dronesMade == MAX_DRONES, leaving logger.waitEnd(...) unpaired; to
fix, move the early-exit check for this.dronesMade == MAX_DRONES to before
calling logger.waitStart(Thread.currentThread().getName()) or, if you must keep
the order, ensure you call logger.waitEnd(Thread.currentThread().getName())
immediately before the return inside the while (tableFull) block so every
waitStart has a matching waitEnd; update the block containing while (tableFull),
logger.waitStart, the this.dronesMade == MAX_DRONES check, and logger.waitEnd
accordingly.
In `@assignment04/documentation/README.md`:
- Around line 73-574: The README.md contains duplicated major sections (notably
repeated "2.2. Primary Executables", "3. How to Run", "4. Diagrams", "5. Logging
Format", "6. Metrics Output", "7. Integration Notes", and "8. Submission
Artifacts") that must be consolidated: remove the duplicated blocks after the
first canonical occurrence, keep one authoritative copy of each section (prefer
the earlier/first occurrence), reconcile the artifacts list so only the correct
filenames (e.g., UML image names and documentation outputs) remain, and ensure
the run instructions reference AssemblyTable.main() and LogAnalyzer.main() only
once and consistently; search for section headings like "2.2. Primary
Executables", "3. How to Run", "4. Diagrams", "5. Logging Format", and "8.
Submission Artifacts" to locate and delete the duplicate content while
preserving the initial canonical text.
In `@assignment04/EventLogger.java`:
- Around line 127-140: In flushToDisk(), avoid clearing the main buffer before
the disk write so events aren't lost if FileWriter fails: copy buffer to a local
list (e.g., toWrite), do the FileWriter write inside try, and only remove the
successfully-written entries from the shared buffer after the write succeeds (or
swap/replace buffer atomically); reference the existing symbols buffer, toWrite,
flushToDisk(), logFileName and the FileWriter block and ensure synchronization
around buffer mutation so failed writes leave pending events intact.
In `@assignment04/LogAnalyzer.java`:
- Around line 29-55: The code currently lets formatter.parse(timeStr) throw a
ParseException that escapes main and aborts processing; wrap the call that
computes timeMs (formatter.parse(timeStr).getTime()) in its own try/catch, catch
ParseException (and any NumberFormatException if you later parse numbers), log
or record the malformed line (e.g., to System.err) and continue the loop so the
bad line is skipped without affecting statsMap, systemStart, or systemEnd;
update the surrounding logic in main where timeMs is used so subsequent code
executes only when parsing succeeded.
In `@assignment04/Technician.java`:
- Around line 54-59: The catch block that swallows InterruptedException in
Technician's worker loop (around the Thread.sleep(...) call where
logger.logEvent(name, "WORK_START") / "WORK_END" are used) must be changed to
handle interruption: do not ignore the exception—restore the thread's interrupt
status with Thread.currentThread().interrupt() and then exit the worker loop (or
return from the run method) so the thread can terminate; optionally log the
interruption via logger.logEvent or logger.error to record the shutdown event.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro
Run ID: af944a9e-5751-43e2-b0a2-bf834c15ba62
⛔ Files ignored due to path filters (4)
assignment04/documentation/README.pdfis excluded by!**/*.pdfassignment04/umlDiagrams/UML_Class_Diagram.pngis excluded by!**/*.pngassignment04/umlDiagrams/UML_Sequence_Diagram_No_Loop.pngis excluded by!**/*.pngassignment04/umlDiagrams/UML_Sequence_Diagram_With_Loop.pngis excluded by!**/*.png
📒 Files selected for processing (9)
assignment04/Agent.javaassignment04/AssemblyTable.javaassignment04/Components.javaassignment04/EventLogger.javaassignment04/LogAnalyzer.javaassignment04/Technician.javaassignment04/documentation/README.htmlassignment04/documentation/README.mdassignment04/documentation/README.txt
📜 Review details
🧰 Additional context used
🧬 Code graph analysis (1)
assignment04/Technician.java (1)
assignment04/EventLogger.java (1)
EventLogger(17-192)
🪛 LanguageTool
assignment04/documentation/README.md
[uncategorized] ~22-~22: Possible missing preposition found.
Context: ...y selects two distinct components - Requests placement onto AssemblyTable - Logs: ...
(AI_HYDRA_LEO_MISSING_IN)
[uncategorized] ~94-~94: Possible missing preposition found.
Context: ...y selects two distinct components - Requests placement onto AssemblyTable - Logs: ...
(AI_HYDRA_LEO_MISSING_IN)
🪛 markdownlint-cli2 (0.21.0)
assignment04/documentation/README.md
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[warning] 493-493: Fenced code blocks should be surrounded by blank lines
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[warning] 494-494: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above
(MD022, blanks-around-headings)
[warning] 494-494: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 495-495: Fenced code blocks should be surrounded by blank lines
(MD031, blanks-around-fences)
[warning] 495-495: Code block style
Expected: indented; Actual: fenced
(MD046, code-block-style)
[warning] 518-518: Fenced code blocks should be surrounded by blank lines
(MD031, blanks-around-fences)
[warning] 520-520: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above
(MD022, blanks-around-headings)
[warning] 520-520: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 520-520: Multiple headings with the same content
(MD024, no-duplicate-heading)
[warning] 531-531: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above
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[warning] 531-531: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 531-531: Multiple headings with the same content
(MD024, no-duplicate-heading)
[warning] 558-558: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above
(MD022, blanks-around-headings)
[warning] 558-558: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 558-558: Multiple headings with the same content
(MD024, no-duplicate-heading)
[warning] 566-566: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Above
(MD022, blanks-around-headings)
[warning] 566-566: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below
(MD022, blanks-around-headings)
[warning] 566-566: Multiple headings with the same content
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[warning] 574-574: Files should end with a single newline character
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🔇 Additional comments (6)
assignment04/documentation/README.txt (1)
11-28: Clear run flow and output artifacts are documented well.The sequence and generated files are easy to follow, and the config section is practical for quick testing.
assignment04/documentation/README.html (1)
25-86: Well-structured HTML documentation.The overview, events, run steps, and output sections are organized clearly, and the diagram references are easy to navigate.
assignment04/Components.java (1)
24-27: Thread-safe component selection update looks good.Using
ThreadLocalRandomhere is a solid fit for concurrent callers without changing the method contract.assignment04/AssemblyTable.java (3)
134-138: LGTM!The
canTakehelper correctly implements eligibility logic with appropriate defensive null checks.
146-156: LGTM!The getter methods are straightforward.
getDronesAssembled()returns a primitiveintwhich has atomic reads in Java, acceptable for informational purposes in this context.
225-233: No issue found:logger.stop()synchronously flushes all buffered records.The
stop()method is synchronized and explicitly callsflushToDisk()as its final operation, which uses try-with-resources to ensure the FileWriter properly closes and flushes all data. The flusher thread is interrupted and joined before the final flush, guaranteeing all buffered log entries are written to disk before the method returns. The log file is complete and ready for analysis beforeLogAnalyzerruns.> Likely an incorrect or invalid review comment.
| try { | ||
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 3000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} | ||
|
|
There was a problem hiding this comment.
🧩 Analysis chain
🏁 Script executed:
fd -t f "Agent.java" assignment04Repository: fareenlavji/rtConcurrentSystems
Length of output: 98
🏁 Script executed:
cat -n assignment04/Agent.javaRepository: fareenlavji/rtConcurrentSystems
Length of output: 3793
Preserve interrupt status instead of ignoring it.
The empty catch block at line 65 consumes InterruptedException and clears the thread's interrupt status, preventing graceful shutdown or external thread cancellation. When Thread.sleep() is interrupted, the exception should be handled by either re-interrupting the thread to restore its interrupted state or exiting the operation.
Proposed fix
try {
logger.logEvent(name, "WORK_START");
Thread.sleep((int)(Math.random() * 3000));
logger.logEvent(name, "WORK_END");
- } catch (InterruptedException e) {}
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ logger.logEvent(name, "THREAD_INTERRUPTED");
+ break;
+ }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/Agent.java` around lines 61 - 66, The catch block in Agent.java
currently swallows InterruptedException; update it to restore the thread's
interrupt status and stop/return from the current work iteration. Replace the
empty catch with code that calls Thread.currentThread().interrupt() and then
either return from the method or break out of the work loop (whichever fits the
surrounding logic in the Agent class/run method) so the interruption is
propagated and the thread can shut down gracefully; keep the
logger.logEvent(name, "WORK_END") handling consistent if needed.
| private final int SIZE = 2; //Capacity of table | ||
| private static final int MAX_DRONES = 20; |
There was a problem hiding this comment.
🧹 Nitpick | 🔵 Trivial
Consider making SIZE a static final constant for consistency.
SIZE is declared as final but not static, while MAX_DRONES is static final. Since SIZE is a compile-time constant and doesn't vary per instance, it should also be static final for consistency and to avoid redundant memory allocation per instance.
♻️ Suggested fix
- private final int SIZE = 2; //Capacity of table
+ private static final int SIZE = 2; //Capacity of table📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| private final int SIZE = 2; //Capacity of table | |
| private static final int MAX_DRONES = 20; | |
| private static final int SIZE = 2; //Capacity of table | |
| private static final int MAX_DRONES = 20; |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/AssemblyTable.java` around lines 20 - 21, Make SIZE a
class-level constant like MAX_DRONES by changing its declaration to static
final; update the field named SIZE in AssemblyTable (currently "private final
int SIZE = 2;") to "private static final int SIZE = 2" so it becomes a
compile-time constant shared across instances and consistent with MAX_DRONES.
| while (tableFull) { | ||
| logger.waitStart(Thread.currentThread().getName()); | ||
|
|
||
| //Exit if no more drones are required to be assembled | ||
| if (this.dronesMade == MAX_DRONES){ return; } | ||
|
|
||
| try { | ||
| wait(); //Tells agent to wait until notified | ||
| } catch (InterruptedException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| if (this.dronesMade == 20){ //Will exit if no more drones are required to be assembled | ||
| return; | ||
| logger.waitEnd(Thread.currentThread().getName()); | ||
| } catch (InterruptedException e) { e.printStackTrace(); } | ||
| } |
There was a problem hiding this comment.
Unbalanced wait logging on early exit.
When dronesMade == MAX_DRONES at line 41, the method returns after waitStart() has been logged but before waitEnd() can be logged. This creates unbalanced log entries that could confuse the LogAnalyzer or produce misleading metrics.
🔧 Proposed fix
while (tableFull) {
- logger.waitStart(Thread.currentThread().getName());
-
//Exit if no more drones are required to be assembled
- if (this.dronesMade == MAX_DRONES){ return; }
+ if (this.dronesMade == MAX_DRONES) { return; }
try {
+ logger.waitStart(Thread.currentThread().getName());
wait(); //Tells agent to wait until notified
logger.waitEnd(Thread.currentThread().getName());
} catch (InterruptedException e) { e.printStackTrace(); }
}🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/AssemblyTable.java` around lines 37 - 47, The code logs
logger.waitStart(...) then may return early when this.dronesMade == MAX_DRONES,
leaving logger.waitEnd(...) unpaired; to fix, move the early-exit check for
this.dronesMade == MAX_DRONES to before calling
logger.waitStart(Thread.currentThread().getName()) or, if you must keep the
order, ensure you call logger.waitEnd(Thread.currentThread().getName())
immediately before the return inside the while (tableFull) block so every
waitStart has a matching waitEnd; update the block containing while (tableFull),
logger.waitStart, the this.dronesMade == MAX_DRONES check, and logger.waitEnd
accordingly.
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 1000)); | ||
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | ||
| } catch (InterruptedException e) {} |
There was a problem hiding this comment.
🧹 Nitpick | 🔵 Trivial
Restore interrupted status when catching InterruptedException.
Swallowing InterruptedException with an empty catch block loses the interrupt signal. Best practice is to restore the interrupt status so that higher-level code can detect the interruption.
♻️ Proposed fix
try {
logger.logEvent(Thread.currentThread().getName(), "WORK_START");
Thread.sleep((int)(Math.random() * 1000));
logger.logEvent(Thread.currentThread().getName(), "WORK_END");
- } catch (InterruptedException e) {}
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 1000)); | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | |
| } catch (InterruptedException e) {} | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 1000)); | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | |
| } catch (InterruptedException e) { | |
| Thread.currentThread().interrupt(); | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/AssemblyTable.java` around lines 62 - 65, The catch block that
swallows InterruptedException in AssemblyTable.java (surrounding
Thread.sleep(...) and logger.logEvent calls) should restore the thread's
interrupted status instead of being empty; update the catch
(InterruptedException e) { ... } to call Thread.currentThread().interrupt() (and
optionally log the interruption via logger.logEvent or logger.error) so
higher-level code can detect the interruption while keeping the existing
logger.logEvent and Thread.sleep usage intact.
| try { | ||
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 1000)); | ||
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | ||
| } catch (InterruptedException e) {} |
There was a problem hiding this comment.
🧹 Nitpick | 🔵 Trivial
Restore interrupted status when catching InterruptedException.
Same issue as in addComponents — the interrupt signal is lost when InterruptedException is caught with an empty block.
♻️ Proposed fix
try {
logger.logEvent(Thread.currentThread().getName(), "WORK_START");
Thread.sleep((int)(Math.random() * 1000));
logger.logEvent(Thread.currentThread().getName(), "WORK_END");
- } catch (InterruptedException e) {}
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| try { | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 1000)); | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | |
| } catch (InterruptedException e) {} | |
| try { | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 1000)); | |
| logger.logEvent(Thread.currentThread().getName(), "WORK_END"); | |
| } catch (InterruptedException e) { | |
| Thread.currentThread().interrupt(); | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/AssemblyTable.java` around lines 118 - 122, The catch block
swallowing InterruptedException loses the thread's interrupted status; update
the catch for InterruptedException (around the Thread.sleep call that logs
WORK_START/WORK_END and uses logger.logEvent) to restore the interrupt by
calling Thread.currentThread().interrupt() (and optionally log the interruption
via logger.logEvent or logger.error) so the interruption is propagated
correctly.
| try { | ||
| agent.join(); | ||
| techFrame.join(); | ||
| techProp.join(); | ||
| techCtrl.join(); | ||
| } catch (InterruptedException e) { e.printStackTrace(); } |
There was a problem hiding this comment.
Handle InterruptedException per-join to ensure all threads are awaited.
If an InterruptedException is thrown during one join(), the remaining threads won't be joined, potentially leaving them running when logger.stop() is called. Consider joining each thread individually or re-attempting joins after restoring the interrupt flag.
🔧 Proposed fix
// Wait for completion
- try {
- agent.join();
- techFrame.join();
- techProp.join();
- techCtrl.join();
- } catch (InterruptedException e) { e.printStackTrace(); }
+ for (Thread t : new Thread[]{agent, techFrame, techProp, techCtrl}) {
+ try {
+ t.join();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ e.printStackTrace();
+ }
+ }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/AssemblyTable.java` around lines 213 - 218, The current single
try/catch around agent.join(), techFrame.join(), techProp.join(),
techCtrl.join() can abort joining remaining threads if an InterruptedException
occurs; change this to handle each join individually (e.g., wrap each join call
for agent, techFrame, techProp, techCtrl in its own try/catch and/or loop to
retry until joined) and if interrupted restore the interrupt flag with
Thread.currentThread().interrupt() so logger.stop() is not called before all
threads are joined; ensure every target thread is attempted to be joined
regardless of interruptions.
| # DRONE ASSEMBLY LINE — LOGGING & METRICS SYSTEM | ||
| _SYSC3303A • RTConcurrentSys • WINTER2026 • Assignment04_ | ||
|
|
||
| ## 1. Simplified Deliverable Requirements | ||
| The system extends the classic **Agent–Technician–Monitor** drone‑assembly concurrency problem by adding: | ||
| - A **daemonized EventLogger** (buffered, asynchronous) | ||
| - A **run‑ID log file** per execution (`assembly_log_YYYYMMDD_HHMMSS.txt`) | ||
| - A **concurrency‑safe measurement layer** that captures: | ||
| - Wait times (`WAIT_START`, `WAIT_END`) | ||
| - Work durations (`WORK_START`, `WORK_END`) | ||
| - Response times (`RESPONSE_TIME`) | ||
| - Throughput + utilization | ||
| - A fully automated **LogAnalyzer** that computes: | ||
| - Total drones assembled | ||
| - Total run time | ||
| - Drones per second | ||
| - Per‑thread waiting time and utilization | ||
| - Average response time | ||
|
|
||
| ### 1.1. Agent (Producer Thread) | ||
| - Randomly selects **two distinct components** | ||
| - Requests placement onto `AssemblyTable` | ||
| - Logs: | ||
| - `COMPONENTS_SELECTED` | ||
| - `PLACED_COMPONENTS` | ||
| - `COMPONENTS_ADDED` | ||
| - `WORK_START / WORK_END` | ||
| - `RESPONSE_TIME` | ||
| - `THREAD_START / THREAD_END` | ||
|
|
||
| ### 1.2. Technician (Consumer Thread) | ||
| - Each Technician has **infinite supply** of exactly **one** component | ||
| - Waits until the *other two* appear on the table | ||
| - Logs: | ||
| - `RETRIEVING_COMPONENT` | ||
| - `PICKED_UP` | ||
| - `DRONE_ASSEMBLED` | ||
| - `WORK_START / WORK_END` | ||
| - `RESPONSE_TIME` | ||
| - `THREAD_START / THREAD_END` | ||
|
|
||
| ### 1.3. AssemblyTable (Monitor) | ||
| - Controls synchronized access to: | ||
| - `addComponents(...)` (Agent) | ||
| - `getComponents(...)` (Technicians) | ||
| - Emits **true wait markers** exactly at blocking points: | ||
| - `WAIT_START` | ||
| - `WAIT_END` | ||
| - Logs: | ||
| - `TABLE_FULL` | ||
| - `TABLE_EMPTY` | ||
| - `READY` (state change notifications) | ||
| - `SYSTEM_START` | ||
| - `SYSTEM_END` | ||
| - `JOB_COMPLETED` | ||
|
|
||
| ### 1.4. EventLogger (Utility + Daemon) | ||
| - Singleton, thread‑safe, buffered | ||
| - Runs a **background flusher thread** | ||
| - Configurable via: | ||
| - `setLogFileName(...)` | ||
| - `setFlushIntervalMs(...)` | ||
| - Writes all log entries to a **run‑ID file** | ||
|
|
||
| ### 1.5. LogAnalyzer (Standalone Parser) | ||
| - Runs automatically after the system ends | ||
| - Reads the generated run‑ID log | ||
| - Produces a detailed human‑readable `metrics.txt` | ||
|
|
||
| *** | ||
| ## 2. File Structure | ||
| ### 2.1. Recommended Layout | ||
| assignment04/ | ||
| ├── Agent.java | ||
| ├── AssemblyTable.java | ||
| ├── Components.java | ||
| ├── EventLogger.java | ||
| ├── LogAnalyzer.java | ||
| ├── Technician.java | ||
| │ | ||
| ├── umlDiagrams/ | ||
| │ ├── UML_Class_Diagram.png | ||
| │ ├── UML_Sequence_Diagram_No_Loop.png | ||
| │ ├── UML_Sequence_Diagram_With_Loop.png | ||
| │ | ||
| ├── documentation/ | ||
| │ ├── README.html | ||
| │ ├── README_extended.html | ||
| │ ├── README_concise.html | ||
| │ ├── README.md | ||
| │ ├── README.txt | ||
| │ | ||
| ├── metrics.txt # auto-generated after run | ||
| └── assembly_log_*.txt # run‑ID logs generated per execution | ||
| ### 2.2. Primary Executables | ||
| Run in this order: | ||
| 1. `AssemblyTable.main()` | ||
| - Spawns Agent + 3 Technicians | ||
| - Starts EventLogger | ||
| - Orchestrates the entire system | ||
| 2. `LogAnalyzer.main()` | ||
| - **Automatically called** at the end of execution | ||
| - Generates metrics summary + `metrics.txt` | ||
|
|
||
| *** | ||
| ## 3. How to Run (IntelliJ) | ||
| 1. Open project → ensure SDK = **Java 8+** | ||
| 2. Run **`AssemblyTable.main()`** | ||
| 3. Wait until: | ||
| - All threads finish | ||
| - Logger flushes and shuts down | ||
| - `LogAnalyzer` executes | ||
| 4. Open produced files: | ||
| - `assembly_log_YYYYMMDD_HHMMSS.txt` | ||
| - `metrics.txt` | ||
|
|
||
| *** | ||
| ## 4. Diagrams | ||
| ## 4.1. UML Class Diagram | ||
| ### 4.1.1 Drone Assembly (Concurrency + Logging) | ||
| ```mermaid | ||
| classDiagram | ||
| direction LR | ||
|
|
||
| class Runnable { | ||
| <<interface>> | ||
| + run() | ||
| } | ||
|
|
||
| class EventLogger { | ||
| <<utility>> | ||
| - logFileName : String | ||
| - flushIntervalMs : long | ||
| - buffer : List~String~ | ||
| + getInstance() | ||
| + start() | ||
| + stop() | ||
| + setLogFileName(name) | ||
| + setFlushIntervalMs(ms) | ||
| + logEvent(e, evt, data) | ||
| + logEventKV(e, evt, kv...) | ||
| + waitStart(e) | ||
| + waitEnd(e) | ||
| } | ||
|
|
||
| class AssemblyTable { | ||
| <<monitor>> | ||
| - components : Components[2] | ||
| - tableFull : boolean | ||
| - dronesMade : int | ||
| + addComponents(c1, c2) | ||
| + getComponents(owns) | ||
| + getDronesAssembled() | ||
| + getMaxDrones() | ||
| } | ||
|
|
||
| class Agent { | ||
| - assemblyTable : AssemblyTable | ||
| - logger : EventLogger | ||
| + run() | ||
| } | ||
|
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||
| class Technician { | ||
| - assemblyTable : AssemblyTable | ||
| - components : Components | ||
| - logger : EventLogger | ||
| + run() | ||
| } | ||
|
|
||
| class AssemblyLine { | ||
| + main(args) | ||
| } | ||
|
|
||
| class Components { | ||
| <<enum>> | ||
| Frame | ||
| PropulsionUnit | ||
| ControlFirmware | ||
| + getRandomComponent() | ||
| } | ||
|
|
||
| Agent ..|> Runnable | ||
| Technician ..|> Runnable | ||
|
|
||
| Agent --> AssemblyTable : uses | ||
| Technician --> AssemblyTable : uses | ||
| AssemblyLine --> Agent : creates/starts | ||
| AssemblyLine --> Technician : creates/starts | ||
|
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||
| Agent ..> EventLogger : calls logEvent(...) | ||
| Technician ..> EventLogger : calls logEvent(...) | ||
| AssemblyTable ..> EventLogger : calls logEvent(...) | ||
| ``` | ||
| ## 4.2. Sequence Diagrams | ||
| ### 4.2.1 Single Assembly Cycle (No Loop) | ||
| ```mermaid | ||
| sequenceDiagram | ||
| autonumber | ||
| participant A as Agent | ||
| participant T as Technician | ||
| participant M as AssemblyTable | ||
| participant L as EventLogger | ||
|
|
||
| A->>M: addComponents(c1, c2) | ||
| M-->>L: logEvent(PLACED_COMPONENTS) | ||
| M-->>L: logEvent(TABLE_FULL) | ||
| M-->>T: notifyAll() | ||
|
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||
| T->>M: getComponents(owns) | ||
| M-->>L: logEvent(PICKED_UP) | ||
| M-->>L: logEvent(DRONE_ASSEMBLED) | ||
| M-->>L: logEvent(TABLE_EMPTY) | ||
| M-->>A: notifyAll() | ||
|
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||
| A->>L: WORK_START / WORK_END | ||
| T->>L: WORK_START / WORK_END | ||
| ``` | ||
| ### 4.2.2 One Assembly Cycle (Looped Notation) | ||
| ```mermaid | ||
| sequenceDiagram | ||
| autonumber | ||
| participant A as Agent | ||
| participant T as Technician | ||
| participant M as AssemblyTable | ||
| participant L as EventLogger | ||
|
|
||
| loop until dronesMade == MAX_DRONES | ||
| A->>M: addComponents(c1, c2) | ||
| M-->>L: logEvent(PLACED_COMPONENTS) | ||
| M-->>L: logEvent(TABLE_FULL) | ||
| M-->>T: notifyAll() | ||
|
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||
| T->>M: getComponents(owns) | ||
| M-->>L: logEvent(PICKED_UP) | ||
| M-->>L: logEvent(DRONE_ASSEMBLED) | ||
| M-->>L: logEvent(TABLE_EMPTY) | ||
| M-->>A: notifyAll() | ||
|
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||
| A->>L: WORK_START / WORK_END | ||
| T->>L: WORK_START / WORK_END | ||
| end | ||
| ``` | ||
| *** | ||
| ## 5. Logging Format | ||
| Every entry follows: | ||
|
|
||
| Event log: [yyyy-MM-dd HH:mm:ss.SSS , ENTITY , EVENT_CODE , key=value; key=value ...] | ||
|
|
||
| **Examples**: | ||
|
|
||
| Event log: [2026-03-14 17:04:22.119 , Agent , PLACED_COMPONENTS , components=[Frame,ControlFirmware]; drones=11] | ||
| Event log: [2026-03-14 17:04:22.892 , Technician-Frame , DRONE_ASSEMBLED , drones=12] | ||
|
|
||
| *** | ||
| ## 6. Metrics Output (metrics.txt) | ||
| Generated automatically by `LogAnalyzer`: | ||
| - Total drones assembled | ||
| - Total time (s) | ||
| - Throughput (drones/s) | ||
| - For **each** Agent/Technician: | ||
| - Total active time | ||
| - Waiting time | ||
| - Utilization = busy / total | ||
| - Average response time (ms) | ||
|
|
||
| Example excerpt: | ||
|
|
||
| ===== METRICS ANALYSIS ===== | ||
| Total drones assembled: 20 | ||
| Total time: 8.542 s | ||
| Throughput: 2.342 drones/s | ||
|
|
||
| Per-thread metrics: | ||
| ------------------------------------- | ||
| Thread: Agent | ||
| Total time: 8.541 s | ||
| Total waiting: 1.222 s | ||
| Utilization: 0.856 | ||
| Average response time: 421.5 ms | ||
|
|
||
| *** | ||
| ## 7. Integration Notes | ||
| - **Wait markers** generated only where real `wait()` occurs → accurate utilization. | ||
| - **Simulated work** wrapped in `WORK_START / WORK_END`. | ||
| - **logEventKV** used for structured metadata (`duration`, `components`, `drones`). | ||
| - **daemon thread** ensures flusher does not block application exit. | ||
| - **run‑ID log filenames** avoids overwriting previous data. | ||
|
|
||
| *** | ||
| ## 8. Submission Artifacts | ||
| Include the following: | ||
| - Source files (`.java`) | ||
| - `documentation\README.txt` | ||
| - `documentation\README.md` | ||
| - `documentation\README.pdf` | ||
| - `umlDiagrams\UML_Sequence_Diagram_With_Loop.png` | ||
| - `umlDiagrams\UML_Sequence_Diagram_No_Loop.png` | ||
| - `umlDiagrams\UML_Class_Diagram.png` | ||
| ### 2.2. Primary Executables | ||
| Run in this order: | ||
| 1. `AssemblyTable.main()` | ||
| - Spawns Agent + 3 Technicians | ||
| - Starts EventLogger | ||
| - Orchestrates the entire system | ||
| 2. `LogAnalyzer.main()` | ||
| - **Automatically called** at the end of execution | ||
| - Generates metrics summary + `metrics.txt` | ||
|
|
||
| *** | ||
| ## 3. How to Run (IntelliJ) | ||
| 1. Open project → ensure SDK = **Java 8+** | ||
| 2. Run **`AssemblyTable.main()`** | ||
| 3. Wait until: | ||
| - All threads finish | ||
| - Logger flushes and shuts down | ||
| - `LogAnalyzer` executes | ||
| 4. Open produced files: | ||
| - `assembly_log_YYYYMMDD_HHMMSS.txt` | ||
| - `metrics.txt` | ||
|
|
||
| *** | ||
| ## 4. Diagrams | ||
| ## 4.1. UML Class Diagram | ||
| ### 4.1.1 Drone Assembly (Concurrency + Logging) | ||
| ```mermaid | ||
| classDiagram | ||
| direction LR | ||
|
|
||
| class Runnable { | ||
| <<interface>> | ||
| + run() | ||
| } | ||
|
|
||
| class EventLogger { | ||
| <<utility>> | ||
| - logFileName : String | ||
| - flushIntervalMs : long | ||
| - buffer : List~String~ | ||
| + getInstance() | ||
| + start() | ||
| + stop() | ||
| + setLogFileName(name) | ||
| + setFlushIntervalMs(ms) | ||
| + logEvent(e, evt, data) | ||
| + logEventKV(e, evt, kv...) | ||
| + waitStart(e) | ||
| + waitEnd(e) | ||
| } | ||
|
|
||
| class AssemblyTable { | ||
| <<monitor>> | ||
| - components : Components[2] | ||
| - tableFull : boolean | ||
| - dronesMade : int | ||
| + addComponents(c1, c2) | ||
| + getComponents(owns) | ||
| + getDronesAssembled() | ||
| + getMaxDrones() | ||
| } | ||
|
|
||
| class Agent { | ||
| - assemblyTable : AssemblyTable | ||
| - logger : EventLogger | ||
| + run() | ||
| } | ||
|
|
||
| class Technician { | ||
| - assemblyTable : AssemblyTable | ||
| - components : Components | ||
| - logger : EventLogger | ||
| + run() | ||
| } | ||
|
|
||
| class AssemblyLine { | ||
| + main(args) | ||
| } | ||
|
|
||
| class Components { | ||
| <<enum>> | ||
| Frame | ||
| PropulsionUnit | ||
| ControlFirmware | ||
| + getRandomComponent() | ||
| } | ||
|
|
||
| Agent ..|> Runnable | ||
| Technician ..|> Runnable | ||
|
|
||
| Agent --> AssemblyTable : uses | ||
| Technician --> AssemblyTable : uses | ||
| AssemblyLine --> Agent : creates/starts | ||
| AssemblyLine --> Technician : creates/starts | ||
|
|
||
| Agent ..> EventLogger : calls logEvent(...) | ||
| Technician ..> EventLogger : calls logEvent(...) | ||
| AssemblyTable ..> EventLogger : calls logEvent(...) | ||
| ``` | ||
| ## 4.2. Sequence Diagrams | ||
| ### 4.2.1 Single Assembly Cycle (No Loop) | ||
| ```mermaid | ||
| sequenceDiagram | ||
| autonumber | ||
| participant A as Agent | ||
| participant T as Technician | ||
| participant M as AssemblyTable | ||
| participant L as EventLogger | ||
|
|
||
| A->>M: addComponents(c1, c2) | ||
| M-->>L: logEvent(PLACED_COMPONENTS) | ||
| M-->>L: logEvent(TABLE_FULL) | ||
| M-->>T: notifyAll() | ||
|
|
||
| T->>M: getComponents(owns) | ||
| M-->>L: logEvent(PICKED_UP) | ||
| M-->>L: logEvent(DRONE_ASSEMBLED) | ||
| M-->>L: logEvent(TABLE_EMPTY) | ||
| M-->>A: notifyAll() | ||
|
|
||
| A->>L: WORK_START / WORK_END | ||
| T->>L: WORK_START / WORK_END | ||
| ``` | ||
| ### 4.2.2 One Assembly Cycle (Looped Notation) | ||
| ```mermaid | ||
| sequenceDiagram | ||
| autonumber | ||
| participant A as Agent | ||
| participant T as Technician | ||
| participant M as AssemblyTable | ||
| participant L as EventLogger | ||
|
|
||
| loop until dronesMade == MAX_DRONES | ||
| A->>M: addComponents(c1, c2) | ||
| M-->>L: logEvent(PLACED_COMPONENTS) | ||
| M-->>L: logEvent(TABLE_FULL) | ||
| M-->>T: notifyAll() | ||
|
|
||
| T->>M: getComponents(owns) | ||
| M-->>L: logEvent(PICKED_UP) | ||
| M-->>L: logEvent(DRONE_ASSEMBLED) | ||
| M-->>L: logEvent(TABLE_EMPTY) | ||
| M-->>A: notifyAll() | ||
|
|
||
| A->>L: WORK_START / WORK_END | ||
| T->>L: WORK_START / WORK_END | ||
| end | ||
| ``` | ||
| *** | ||
| ## 5. Logging Format | ||
| Every entry follows: | ||
|
|
||
| Event log: [yyyy-MM-dd HH:mm:ss.SSS , ENTITY , EVENT_CODE , key=value; key=value ...] | ||
|
|
||
| **Examples**: | ||
|
|
||
| Event log: [2026-03-14 17:04:22.119 , Agent , PLACED_COMPONENTS , components=[Frame,ControlFirmware]; drones=11] | ||
| Event log: [2026-03-14 17:04:22.892 , Technician-Frame , DRONE_ASSEMBLED , drones=12] | ||
|
|
||
| *** | ||
| ## 6. Metrics Output (metrics.txt) | ||
| Generated automatically by `LogAnalyzer`: | ||
| - Total drones assembled | ||
| - Total time (s) | ||
| - Throughput (drones/s) | ||
| - For **each** Agent/Technician: | ||
| - Total active time | ||
| - Waiting time | ||
| - Utilization = busy / total | ||
| - Average response time (ms) | ||
|
|
||
| Example excerpt: | ||
|
|
||
| ===== METRICS ANALYSIS ===== | ||
| Total drones assembled: 20 | ||
| Total time: 8.542 s | ||
| Throughput: 2.342 drones/s | ||
|
|
||
| Per-thread metrics: | ||
| ------------------------------------- | ||
| Thread: Agent | ||
| Total time: 8.541 s | ||
| Total waiting: 1.222 s | ||
| Utilization: 0.856 | ||
| Average response time: 421.5 ms | ||
|
|
||
| *** | ||
| ## 7. Integration Notes | ||
| - **Wait markers** generated only where real `wait()` occurs → accurate utilization. | ||
| - **Simulated work** wrapped in `WORK_START / WORK_END`. | ||
| - **logEventKV** used for structured metadata (`duration`, `components`, `drones`). | ||
| - **daemon thread** ensures flusher does not block application exit. | ||
| - **run‑ID log filenames** avoids overwriting previous data. | ||
|
|
||
| *** | ||
| ## 8. Submission Artifacts | ||
| Include the following: | ||
| - Source files (`.java`) | ||
| - `documentation\README.txt` | ||
| - `documentation\README.md` | ||
| - `documentation\README.pdf` | ||
| - `umlDiagrams\MaxDrone_Looped_SequenceDiagram.png` | ||
| - `umlDiagrams\SingleRun_SequenceDiagram.png` | ||
| - `umlDiagrams\UML_Class_Diagram.png` No newline at end of file |
There was a problem hiding this comment.
Remove duplicated content blocks and keep one canonical README.
From Line 73 onward, the document repeats major sections and headings, which creates conflicting artifact references and makes run instructions ambiguous.
🧰 Tools
🪛 LanguageTool
[uncategorized] ~94-~94: Possible missing preposition found.
Context: ...y selects two distinct components - Requests placement onto AssemblyTable - Logs: ...
(AI_HYDRA_LEO_MISSING_IN)
🪛 markdownlint-cli2 (0.21.0)
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(MD047, single-trailing-newline)
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/documentation/README.md` around lines 73 - 574, The README.md
contains duplicated major sections (notably repeated "2.2. Primary Executables",
"3. How to Run", "4. Diagrams", "5. Logging Format", "6. Metrics Output", "7.
Integration Notes", and "8. Submission Artifacts") that must be consolidated:
remove the duplicated blocks after the first canonical occurrence, keep one
authoritative copy of each section (prefer the earlier/first occurrence),
reconcile the artifacts list so only the correct filenames (e.g., UML image
names and documentation outputs) remain, and ensure the run instructions
reference AssemblyTable.main() and LogAnalyzer.main() only once and
consistently; search for section headings like "2.2. Primary Executables", "3.
How to Run", "4. Diagrams", "5. Logging Format", and "8. Submission Artifacts"
to locate and delete the duplicate content while preserving the initial
canonical text.
| private void flushToDisk() { | ||
| List<String> toWrite; | ||
| synchronized (buffer) { | ||
| if (buffer.isEmpty()) { return; } | ||
| toWrite = new ArrayList<>(buffer); | ||
| buffer.clear(); | ||
| } | ||
| try (FileWriter fw = new FileWriter(logFileName, true)) { | ||
| for (String line : toWrite) { | ||
| fw.write(line); | ||
| fw.write(System.lineSeparator()); | ||
| } | ||
| } catch (IOException e) { e.printStackTrace(); } | ||
| } |
There was a problem hiding this comment.
Prevent log loss on write failures.
At Line 132, the buffer is cleared before disk I/O. If FileWriter throws at Line 139, pending events are dropped.
Proposed fix
private void flushToDisk() {
- List<String> toWrite;
- synchronized (buffer) {
- if (buffer.isEmpty()) { return; }
- toWrite = new ArrayList<>(buffer);
- buffer.clear();
- }
- try (FileWriter fw = new FileWriter(logFileName, true)) {
- for (String line : toWrite) {
- fw.write(line);
- fw.write(System.lineSeparator());
- }
- } catch (IOException e) { e.printStackTrace(); }
+ synchronized (buffer) {
+ if (buffer.isEmpty()) { return; }
+ try (FileWriter fw = new FileWriter(logFileName, true)) {
+ for (String line : buffer) {
+ fw.write(line);
+ fw.write(System.lineSeparator());
+ }
+ buffer.clear(); // clear only after successful write
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+ }
}📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| private void flushToDisk() { | |
| List<String> toWrite; | |
| synchronized (buffer) { | |
| if (buffer.isEmpty()) { return; } | |
| toWrite = new ArrayList<>(buffer); | |
| buffer.clear(); | |
| } | |
| try (FileWriter fw = new FileWriter(logFileName, true)) { | |
| for (String line : toWrite) { | |
| fw.write(line); | |
| fw.write(System.lineSeparator()); | |
| } | |
| } catch (IOException e) { e.printStackTrace(); } | |
| } | |
| private void flushToDisk() { | |
| synchronized (buffer) { | |
| if (buffer.isEmpty()) { return; } | |
| try (FileWriter fw = new FileWriter(logFileName, true)) { | |
| for (String line : buffer) { | |
| fw.write(line); | |
| fw.write(System.lineSeparator()); | |
| } | |
| buffer.clear(); // clear only after successful write | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/EventLogger.java` around lines 127 - 140, In flushToDisk(),
avoid clearing the main buffer before the disk write so events aren't lost if
FileWriter fails: copy buffer to a local list (e.g., toWrite), do the FileWriter
write inside try, and only remove the successfully-written entries from the
shared buffer after the write succeeds (or swap/replace buffer atomically);
reference the existing symbols buffer, toWrite, flushToDisk(), logFileName and
the FileWriter block and ensure synchronization around buffer mutation so failed
writes leave pending events intact.
| public static void main(String[] args) throws IOException, ParseException { | ||
| String logFile = (args != null && args.length > 0 | ||
| && args[0] != null && !args[0].trim().isEmpty()) ? args[0].trim() : LOG_FILE_NAME; | ||
|
|
||
| Map<String, ThreadStats> statsMap = new HashMap<>(); | ||
| long systemStart = Long.MAX_VALUE; | ||
| long systemEnd = Long.MIN_VALUE; | ||
| int totalDrones = 0; | ||
| StringBuilder out = new StringBuilder(); // accumulate all output lines | ||
|
|
||
| try (BufferedReader br = new BufferedReader(new FileReader(logFile))) { | ||
| String line; | ||
| while ((line = br.readLine()) != null) { | ||
| int l = line.indexOf('['), r = line.lastIndexOf(']'); | ||
| if (l < 0 || r <= l) continue; | ||
| String content = line.substring(l + 1, r); | ||
|
|
||
| String[] parts = content.split(",", 4); | ||
| if (parts.length < 3) continue; | ||
| for (int i = 0; i < parts.length; i++) parts[i] = parts[i].trim(); | ||
|
|
||
| String timeStr = parts[0]; | ||
| String entity = parts[1]; | ||
| String event = parts[2]; | ||
| String extra = (parts.length == 4) ? parts[3] : ""; | ||
| long timeMs = formatter.parse(timeStr).getTime(); | ||
|
|
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Avoid terminating analysis on one malformed log line.
At Line 54, formatter.parse(timeStr) can throw and exit main (Line 29), which drops the entire metrics run instead of skipping bad input.
Proposed fix
-public static void main(String[] args) throws IOException, ParseException {
+public static void main(String[] args) throws IOException {
@@
- long timeMs = formatter.parse(timeStr).getTime();
+ long timeMs;
+ try {
+ timeMs = formatter.parse(timeStr).getTime();
+ } catch (ParseException ignored) {
+ continue; // skip malformed line, continue analyzing
+ }🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/LogAnalyzer.java` around lines 29 - 55, The code currently lets
formatter.parse(timeStr) throw a ParseException that escapes main and aborts
processing; wrap the call that computes timeMs
(formatter.parse(timeStr).getTime()) in its own try/catch, catch ParseException
(and any NumberFormatException if you later parse numbers), log or record the
malformed line (e.g., to System.err) and continue the loop so the bad line is
skipped without affecting statsMap, systemStart, or systemEnd; update the
surrounding logic in main where timeMs is used so subsequent code executes only
when parsing succeeded.
| try { | ||
| logger.logEvent(name, "WORK_START"); | ||
| Thread.sleep((int)(Math.random() * 5000)); | ||
| logger.logEvent(name, "WORK_END"); | ||
| } catch (InterruptedException e) {} | ||
|
|
There was a problem hiding this comment.
🧩 Analysis chain
🏁 Script executed:
find . -name "Technician.java" -type fRepository: fareenlavji/rtConcurrentSystems
Length of output: 136
🏁 Script executed:
if [ -f "assignment04/Technician.java" ]; then
wc -l assignment04/Technician.java
fiRepository: fareenlavji/rtConcurrentSystems
Length of output: 106
🏁 Script executed:
if [ -f "assignment04/Technician.java" ]; then
cat -n assignment04/Technician.java
fiRepository: fareenlavji/rtConcurrentSystems
Length of output: 3698
Do not swallow interrupts in worker loop.
At line 58, the InterruptedException is caught and ignored. In a multithreaded system where threads are cancelled via the standard interrupt mechanism, this empty catch block prevents the thread from responding to interruption requests. When Thread.interrupt() is called on this thread (e.g., for graceful shutdown), the InterruptedException thrown by Thread.sleep() is silently caught, the interrupt status is cleared, and the worker loop continues running, defeating proper thread cancellation.
Proposed fix
try {
logger.logEvent(name, "WORK_START");
Thread.sleep((int)(Math.random() * 5000));
logger.logEvent(name, "WORK_END");
- } catch (InterruptedException e) {}
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ logger.logEvent(name, "THREAD_INTERRUPTED");
+ break;
+ }📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| try { | |
| logger.logEvent(name, "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 5000)); | |
| logger.logEvent(name, "WORK_END"); | |
| } catch (InterruptedException e) {} | |
| try { | |
| logger.logEvent(name, "WORK_START"); | |
| Thread.sleep((int)(Math.random() * 5000)); | |
| logger.logEvent(name, "WORK_END"); | |
| } catch (InterruptedException e) { | |
| Thread.currentThread().interrupt(); | |
| logger.logEvent(name, "THREAD_INTERRUPTED"); | |
| break; | |
| } |
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@assignment04/Technician.java` around lines 54 - 59, The catch block that
swallows InterruptedException in Technician's worker loop (around the
Thread.sleep(...) call where logger.logEvent(name, "WORK_START") / "WORK_END"
are used) must be changed to handle interruption: do not ignore the
exception—restore the thread's interrupt status with
Thread.currentThread().interrupt() and then exit the worker loop (or return from
the run method) so the thread can terminate; optionally log the interruption via
logger.logEvent or logger.error to record the shutdown event.
