Add RandomAccessMemory class for in-memory binary operations

dart/lib/dev_tools/watch_tickets.dart

@@ -0,0 +1,84 @@
+import 'dart:io';
+import 'dart:async';
+import 'package:sweepstore/header.dart';
+
+
+void main() async {
+  int refreshCount = 0;
+  int? previousMasterHeartbeat;
+  Map<int, int> previousWorkerHeartbeats = {};
+
+  while (true) {
+    // Clear console
+    if (Platform.isWindows) {
+      print(Process.runSync("cls", [], runInShell: true).stdout);
+    } else {
+      print(Process.runSync("clear", [], runInShell: true).stdout);
+    }
+
+    refreshCount++;
+
+    // Read example.bin
+    final file = File('example.bin');
+
+    if (await file.exists()) {
+      final raf = await file.open(mode: FileMode.read);
+
+
+      try {
+        final header = SweepstoreHeader(raf);
+        final concurrency = header.concurrency;
+
+        int now32 = (DateTime.now().millisecondsSinceEpoch ~/ 1000) & 0xFFFFFFFF;
+
+        print('Sweepstore Tickets - Refresh #$refreshCount');
+        print('Current Time (now32): $now32');
+        print('Master ID: ${concurrency.masterIdentifier}');
+
+        int masterAge = now32 - concurrency.masterHeartbeat;
+        String masterStatus = masterAge > 5 ? "(stale)" : "(active)";
+        String masterPrevious = previousMasterHeartbeat != null ? "(previously $previousMasterHeartbeat)" : "";
+        print('Master Heartbeat: ${concurrency.masterHeartbeat} $masterStatus $masterPrevious');
+
+        print('Workers: ${concurrency.numberOfWorkers}');
+        print('Read Allowed: ${concurrency.isReadAllowed}');
+        print('');
+
+        // display each ticket
+        for (int i = 0; i < concurrency.numberOfWorkers; i++) {
+          final ticket = concurrency[i];
+
+          print('--- Ticket #$i ---');
+          print('  Identifier: ${ticket.identifier}');
+
+          int workerAge = now32 - ticket.workerHeartbeat;
+          String workerStatus = workerAge > 5 ? "(stale)" : "(active)";
+          String workerPrevious = previousWorkerHeartbeats.containsKey(i) ? "(previously ${previousWorkerHeartbeats[i]})" : "";
+          print('  Heartbeat: ${ticket.workerHeartbeat} $workerStatus $workerPrevious');
+
+          print('  State: ${ticket.ticketState.name}');
+          print('  Operation: ${ticket.ticketOperation.name}');
+          print('  Key Hash: ${ticket.keyHash}');
+          print('  Write Ptr: ${ticket.writePointer}');
+          print('  Write Size: ${ticket.writeSize} bytes');
+          print('');
+
+          // update previous heartbeat
+          previousWorkerHeartbeats[i] = ticket.workerHeartbeat;
+
+        }
+
+        // updat previous master heartbeat
+        previousMasterHeartbeat = concurrency.masterHeartbeat;
+
+        print('--- Refreshing in 1 seconds ---');
+      } finally {
+        await raf.close();
+      }
+    } else {
+      print('Error: example.bin not found - Refresh #$refreshCount');
+    }
+
+    await Future.delayed(Duration(seconds: 1));
+  }
+}