lab 4

src/main/java/ru/lionarius/CalculationThread.java

@@ -0,0 +1,28 @@
+package ru.lionarius;
+
+import java.util.function.Function;
+
+public class CalculationThread extends Thread {
+    private final IntegralCalculator calculator;
+    private final Function<Double, Double> function;
+    private final double lowerBound;
+    private final double upperBound;
+    
+    private double result;
+    
+    public CalculationThread(IntegralCalculator calculator, Function<Double, Double> function, double lowerBound, double upperBound) {
+        this.calculator = calculator;
+        this.function = function;
+        this.lowerBound = lowerBound;
+        this.upperBound = upperBound;
+    }
+    
+    @Override
+    public void run() {
+        this.result = this.calculator.calculate(this.function, this.lowerBound, this.upperBound);
+    }
+    
+    public double getResult() {
+        return this.result;
+    }
+}

src/main/java/ru/lionarius/IntegralCalculator.java

@@ -94,6 +94,9 @@ public class IntegralCalculator {
 
         var sum = (function.apply(lowerBound) + function.apply(upperBound)) / 2;
         for (var i = 1L; i < n; i++) {
+            if (Thread.interrupted())
+                break;
+            
             sum += function.apply(lowerBound + h * i);
 
             this.callProgressCallback(i, n);

src/main/java/ru/lionarius/Main.java

@@ -1,54 +1,130 @@
 package ru.lionarius;
 
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Scanner;
 import java.util.function.Function;
 
 public class Main {
+    /**
+     * Counter to assign unique IDs to each calculation thread.
+     */
+    private static int currentId = 0;
+
+    /**
+     * Map to store active calculation threads, with thread IDs as keys.
+     */
+    private static final Map<Integer, CalculationThread> threads = new HashMap<>();
+
     public static void main(String[] args) {
-        Function<Double, Double> function = x -> Math.sin(x) * x;
-        var lowerBound = 0.0;
-        var upperBound = 1.0;
-        double[] accuracies = {0.001, 0.00001, 0.0000001, 0.000000001, 0.000000001};
-        var threads = new Thread[accuracies.length];
+        final Function<Double, Double> function = x -> Math.sin(x) * x;
+        final var lowerBound = 0.0;
+        final var upperBound = 1.0;
 
-        for (var i = 0; i < accuracies.length; i++) {
-            final var accuracy = accuracies[i];
-            var thread = new Thread(() -> {
-                var calculator = new IntegralCalculator(
-                        accuracy,
-                        (current, total) -> {
-                            if (current % (total / 15) != 0)
-                                return;
-                            System.out.printf(
-                                    "[%s] Progress: %.2f%%%n",
-                                    Thread.currentThread().getName(),
-                                    (current * 100.0 / total)
-                            );
-                        }
-                );
+        var scanner = new Scanner(System.in);
 
-                var startTime = System.nanoTime();
+        while (true) {
+            System.out.println("Enter desired command (start <e>, stop <n>, await <n>, exit):");
+            var input = scanner.nextLine().trim();
+            var command = input.split(" ");
 
-                var value = calculator.calculate(function, lowerBound, upperBound);
-
-                var totalTime = System.nanoTime() - startTime;
-
-                System.out.printf(
-                        "[%s] Calculated value: %.15f | Accuracy: %e | Time: %.9fms%n",
-                        Thread.currentThread().getName(),
-                        value,
-                        accuracy,
-                        totalTime / 1_000_000.0
-                );
-            });
-            threads[i] = thread;
-            thread.start();
+            if (command.length == 0) {
+                System.out.println("No command entered.");
+                continue;
             }
 
             try {
-            for (var thread : threads)
-                thread.join();
-        } catch (InterruptedException e) {
-            throw new RuntimeException(e);
+                switch (command[0]) {
+                    case "start" -> handleStartCommand(command, function, lowerBound, upperBound);
+                    case "stop" -> handleStopCommand(command);
+                    case "await" -> handleAwaitCommand(command);
+                    case "exit" -> handleExitCommand();
+                    default -> System.out.println("Unknown command");
                 }
+            } catch (NumberFormatException e) {
+                System.out.println("Invalid number format: " + e.getMessage());
+            } catch (Exception e) {
+                System.out.println("Error executing command: " + e.getMessage());
+            }
+        }
+    }
+
+    /**
+     * Handles the "start" command. This starts a new thread to calculate
+     * the integral of the given function with the specified accuracy.
+     *
+     * @param command    the command array where the second element is the desired accuracy
+     * @param function   the mathematical function to be integrated
+     * @param lowerBound the lower bound of the integral
+     * @param upperBound the upper bound of the integral
+     */
+    private static void handleStartCommand(String[] command, Function<Double, Double> function, double lowerBound, double upperBound) {
+        if (command.length < 2) {
+            System.out.println("Usage: start <accuracy>");
+            return;
+        }
+        double accuracy = Double.parseDouble(command[1]);
+        var thread = new CalculationThread(new IntegralCalculator(accuracy), function, lowerBound, upperBound);
+        int id = currentId++;
+        threads.put(id, thread);
+        System.out.println("Started calculation on thread " + id);
+        thread.start();
+    }
+
+    /**
+     * Handles the "stop" command. This stops and removes the calculation thread
+     * associated with the given ID.
+     *
+     * @param command the command array where the second element is the ID of the thread to stop
+     */
+    private static void handleStopCommand(String[] command) {
+        if (command.length < 2) {
+            System.out.println("Usage: stop <threadId>");
+            return;
+        }
+        int id = Integer.parseInt(command[1]);
+        var thread = threads.remove(id);
+        if (thread == null) {
+            System.out.println("Thread " + id + " not found");
+        } else {
+            thread.interrupt();
+            System.out.println("Stopped thread " + id);
+        }
+    }
+
+    /**
+     * Handles the "await" command. This waits for the specified thread to finish
+     * its calculation and then prints the result.
+     *
+     * @param command the command array where the second element is the ID of the thread to await
+     */
+    private static void handleAwaitCommand(String[] command) {
+        if (command.length < 2) {
+            System.out.println("Usage: await <threadId>");
+            return;
+        }
+        int id = Integer.parseInt(command[1]);
+        var thread = threads.remove(id);
+        if (thread == null) {
+            System.out.println("Thread " + id + " not found");
+            return;
+        }
+        try {
+            thread.join();
+            System.out.println("Result: " + thread.getResult());
+        } catch (InterruptedException e) {
+            System.out.println("Thread was interrupted while awaiting: " + e.getMessage());
+        }
+    }
+
+
+    /**
+     * Handles the "exit" command. This stops all active calculation threads and
+     * exits the application.
+     */
+    private static void handleExitCommand() {
+        System.out.println("Shutting down...");
+        threads.values().forEach(CalculationThread::interrupt);
+        System.exit(0);
     }
 }