web: Show position in line

web/backend/Makefile

@@ -13,3 +13,11 @@ docker-run:
 		--memory 16g \
 		--cpus 4 \
 		ucjl-backend
+
+test:
+	clear; julia --threads 1 --procs 1 --project=test -e "using BackendT; runtests()"
+
+run:
+	julia --procs 1 --project=. startup.jl
+
+.PHONY: test

web/backend/src/jobs.jl

@@ -8,50 +8,81 @@ import Base: put!
 Base.@kwdef mutable struct JobProcessor
     pending = RemoteChannel(() -> Channel{String}(Inf))
     processing = RemoteChannel(() -> Channel{String}(Inf))
+    completed = RemoteChannel(() -> Channel{String}(Inf))
     shutdown = RemoteChannel(() -> Channel{Bool}(1))
     worker_pids = []
     worker_tasks = []
     work_fn = nothing
+    master_task = nothing
+    job_status = Dict()
+    job_position = Dict()
+    pending_queue = []
+end
+
+function update_positions!(processor::JobProcessor)
+    for (i, job_id) in enumerate(processor.pending_queue)
+        processor.job_position[job_id] = i
+    end
 end
 
 function Base.put!(processor::JobProcessor, job_id::String)
-    return put!(processor.pending, job_id)
+    put!(processor.pending, job_id)
+    processor.job_status[job_id] = "pending"
+    push!(processor.pending_queue, job_id)
+    update_positions!(processor)
 end
 
-function isbusy(processor::JobProcessor)
-    return isready(processor.pending) || isready(processor.processing)
+function master_loop(processor)
+    @info "Starting master loop"
+    while true
+        # Check for shutdown signal
+        if isready(processor.shutdown)
+            break
+        end
+
+        # Check for processing jobs
+        while isready(processor.processing)
+            job_id = take!(processor.processing)
+            processor.job_status[job_id] = "processing"
+            filter!(x -> x != job_id, processor.pending_queue)
+            delete!(processor.job_position, job_id)
+            update_positions!(processor)
+        end
+
+        # Check for completed jobs
+        while isready(processor.completed)
+            job_id = take!(processor.completed)
+            delete!(processor.job_status, job_id)
+            delete!(processor.job_position, job_id)
+        end
+
+        sleep(0.1)
+    end
 end
 
-function worker_loop(pending, processing, shutdown, work_fn)
+function worker_loop(pending, processing, completed, shutdown, work_fn)
     @info "Starting worker loop"
     while true
         # Check for shutdown signal
         if isready(shutdown)
-            @info "Shutdown signal received"
             break
         end
 
-        # Wait for a job with timeout
-        if !isready(pending)
-            sleep(0.1)
-            continue
+        # Check for pending tasks
+        if isready(pending)
+            job_id = take!(pending)
+            put!(processing, job_id)
+            @info "Job started: $job_id"
+            try
+                work_fn(job_id)
+                put!(completed, job_id)
+            catch e
+                @error "Job failed: job $job_id"
+            end
+            @info "Job finished: $job_id"
         end
 
-        # Move job from pending to processing queue
-        job_id = take!(pending)
-        put!(processing, job_id)
-        @info "Job started: $job_id"
-
-        # Run work function
-        try
-            work_fn(job_id)
-        catch e
-            @error "Job failed: job $job_id"
-        end
-
-        # Remove job from processing queue
-        take!(processing)
-        @info "Job finished: $job_id"
+        sleep(0.1)
     end
 end
 
@@ -66,6 +97,7 @@ function start(processor::JobProcessor)
             worker_loop(
                 processor.pending,
                 processor.processing,
+                processor.completed,
                 processor.shutdown,
                 processor.work_fn,
             )
@@ -73,23 +105,19 @@ function start(processor::JobProcessor)
         push!(processor.worker_pids, pid)
         push!(processor.worker_tasks, task)
     end
+
+    # Start master loop (after spawning workers to avoid serialization issues)
+    processor.master_task = @async master_loop(processor)
+
     return
 end
 
 function stop(processor::JobProcessor)
-    # Send shutdown signal (all workers will see it)
     put!(processor.shutdown, true)
-
-    # Wait for all worker tasks to complete
+    wait(processor.master_task)
     for (i, task) in enumerate(processor.worker_tasks)
-        try
-            wait(task)
-            @info "Worker $(processor.worker_pids[i]) stopped"
-        catch e
-            @warn "Error waiting for worker $(processor.worker_pids[i])" exception=e
-        end
+        wait(task)
     end
-
     return
 end
 

web/backend/src/log.jl

@@ -31,6 +31,8 @@ end
 
 function setup_logger()
     global_logger(TimeLogger())
-    @spawn global_logger(TimeLogger())
+    for pid in workers()
+        @spawnat pid global_logger(TimeLogger())
+    end
     return
 end

web/backend/src/server.jl

@@ -53,7 +53,7 @@ function submit(req, processor::JobProcessor)
     return HTTP.Response(200, RESPONSE_HEADERS, response_body)
 end
 
-function jobs_view(req)
+function jobs_view(req, processor)
     # Extract job_id from URL path /api/jobs/{job_id}/view
     path_parts = split(req.target, '/')
     job_id = path_parts[4]
@@ -74,9 +74,19 @@ function jobs_view(req)
     output_path = joinpath(job_dir, "output.json")
     output_content = isfile(output_path) ? read(output_path, String) : nothing
 
-    # Create response JSON
-    response_data = Dict("log" => log_content, "solution" => output_content)
+    # Read job status
+    job_status = "unknown"
+    if output_content !== nothing
+        job_status = "completed"
+    elseif haskey(processor.job_status, job_id)
+        job_status = processor.job_status[job_id]
+    end
 
+    # Read job position (0 if already processed or not found)
+    job_position = get(processor.job_position, job_id, 0)
+
+    # Create response JSON
+    response_data = Dict("log" => log_content, "solution" => output_content, "status" => job_status, "position" => job_position)
     response_body = JSON.json(response_data)
     return HTTP.Response(200, RESPONSE_HEADERS, response_body)
 end
@@ -134,7 +144,7 @@ function start_server(host, port; optimizer)
     HTTP.register!(router, "POST", "/api/submit", req -> submit(req, processor))
 
     # Register job/*/view endpoint
-    HTTP.register!(router, "GET", "/api/jobs/*/view", jobs_view)
+    HTTP.register!(router, "GET", "/api/jobs/*/view", req -> jobs_view(req, processor))
 
     server = HTTP.serve!(router, host, port; verbose = false)
     return ServerHandle(server, processor)

web/backend/test/src/server_test.jl

@@ -26,10 +26,7 @@ function server_test_usage()
         @test length(job_id) == 16
 
         # Wait for jobs to finish
-        sleep(5)
-        while isbusy(server.processor)
-            sleep(0.1)
-        end
+        sleep(10)
 
         # Verify the compressed file was saved correctly
         job_dir = joinpath(Backend.basedir, "jobs", job_id)
@@ -52,6 +49,7 @@ function server_test_usage()
         @test haskey(view_data, "solution")
         @test view_data["log"] !== nothing
         @test view_data["solution"] !== nothing
+        @test view_data["status"] == "completed"
 
         # Clean up
         rm(job_dir, recursive = true)

web/frontend/Dockerfile

@@ -8,11 +8,11 @@ ARG REACT_APP_BACKEND_URL
 ENV REACT_APP_BACKEND_URL=$REACT_APP_BACKEND_URL
 RUN npm run build
  
- # Production Stage
- FROM node:18-alpine AS production
- WORKDIR /app
- COPY --from=build /app/build ./build
- COPY server.js ./
- RUN npm install --production express
- EXPOSE 3000
- CMD ["node", "server.js"]
+# Production Stage
+FROM node:18-alpine AS production
+WORKDIR /app
+COPY --from=build /app/build ./build
+COPY server.js ./
+RUN npm install --production express
+EXPOSE 3000
+CMD ["node", "server.js"]

web/frontend/src/components/Jobs/Jobs.tsx

@@ -15,6 +15,7 @@ import formStyles from "../Common/Forms/Form.module.css";
 interface JobData {
   log: string;
   solution: any;
+  position: number;
 }
 
 const Jobs = () => {
@@ -81,7 +82,9 @@ const Jobs = () => {
         <SectionHeader title="Optimization log"></SectionHeader>
         <div className={formStyles.FormWrapper}>
           <div className={styles.SolverLog} ref={logRef}>
-            {jobData ? jobData.log : "Loading..."}
+            {jobData
+              ? jobData.log || `Waiting for ${jobData.position} other optimization job(s) to finish...`
+              : "Loading..."}
           </div>
         </div>
       </div>