Implemented transactions record

src/main/java/Main.java

@@ -0,0 +1,55 @@
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+import model.BlockChain;
+import util.TransactionsGenerator;
+import model.Miner;
+import util.FileManagement;
+import util.Security;
+
+public final class Main {
+
+    public static void main(final String[] args) throws InterruptedException, IOException {
+
+        final var nThreads = Runtime.getRuntime().availableProcessors();
+        final var blockChain = BlockChain.getInstance();
+
+        // Cryptographic keys management
+        final File publicKey = new File(Security.PUBLIC_KEY);
+        final File privateKey = new File(Security.PRIVATE_KEY);
+
+        if (!publicKey.exists() || !privateKey.exists()) {
+            Security.generateKeys();
+        }
+
+        final var transactionsExecutor = Executors.newScheduledThreadPool(nThreads);
+
+        // Mocks a generator to send transactions into the blockchain
+        transactionsExecutor.scheduleAtFixedRate(new TransactionsGenerator(blockChain), 0, 200, TimeUnit.MILLISECONDS);
+
+        final var minerExecutor = Executors.newFixedThreadPool(nThreads);
+
+        // Creation of 15 miners
+        IntStream.range(0, 15)
+            .mapToObj(minerId -> new Miner(minerId, blockChain))
+            .forEach(minerExecutor::submit);
+
+        minerExecutor.shutdown();
+
+        if (!minerExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
+            minerExecutor.shutdownNow();
+        }
+
+        transactionsExecutor.shutdown();
+
+        if (!transactionsExecutor.awaitTermination(60, TimeUnit.SECONDS)) {
+            transactionsExecutor.shutdownNow();
+        }
+
+        FileManagement.saveBlockChain(blockChain);
+
+    }
+
+}