Added dependency checker helper

Author: bbottema

modules/simple-java-mail/src/test/java/demo/DependencyChecker.java

@@ -0,0 +1,76 @@
+package demo;
+
+import lombok.SneakyThrows;
+import lombok.val;
+import org.simplejavamail.email.EmailBuilder;
+import org.simplejavamail.internal.util.MiscUtil;
+import testutil.ModuleLoaderTestHelper;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import static java.lang.String.format;
+import static org.bbottema.genericobjectpool.util.SleepUtil.sleep;
+
+public class DependencyChecker extends DemoAppBase {
+
+    static {
+        // make Simple Java Mail ignore the batch module, so the JVM is never blocked from shutting down (because of the connection pool)
+        ModuleLoaderTestHelper._forceDisableBatchModule();
+    }
+
+    public static void main(String[] args) throws IOException {
+        val group = MiscUtil.checkArgumentNotEmpty(args[0], "arg 0 should be the group id");
+        val artifact = MiscUtil.checkArgumentNotEmpty(args[1], "arg 1 should be the artifact id");
+        val version = MiscUtil.checkArgumentNotEmpty(args[2], "arg 2 should be the version");
+
+        val urlString = format("https://repo1.maven.org/maven2/%s/%s/%s", group.replaceAll("\\W", "/"), artifact, version);
+        HttpURLConnection connection = null;
+
+        System.out.println("Checking URL: " + urlString);
+
+        while (true) {
+            try {
+                connection = (HttpURLConnection) new URL(urlString).openConnection();
+                connection.setRequestMethod("HEAD");
+                if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
+                    String dependency = group + ":" + artifact + ":" + version;
+                    mailerTLSBuilder
+                            .withDebugLogging(false)
+                            .buildMailer()
+                            .sendMail(EmailBuilder.startingBlank()
+                                    .from("Dependency Checker", "[email protected]")
+                                    .to(YOUR_GMAIL_ADDRESS)
+                                    .withSubject("Dependency available: " + dependency)
+                                    .withPlainText(format("The dependency '%s' is available at %s", dependency, urlString))
+                                    .buildEmail());
+
+                    // Windows 10 notification (lower right corner) - requires Windows 10 and the Windows 10 JDK:
+                    val notificationTitle = showOSNotification("Notification Title", format("The dependency '%s' is available", dependency));
+                    sleep(10_000);
+                    SystemTray.getSystemTray().remove(notificationTitle);
+                    break;
+                }
+            } catch (IOException e) {
+                System.err.println("Error while checking the URL: " + e.getMessage());
+            } finally {
+                if (connection != null) {
+                    connection.disconnect();
+                }
+            }
+
+            sleep(1000);
+        }
+    }
+
+    @SneakyThrows
+    public static TrayIcon showOSNotification(String notificationTitle, String msg) {
+        TrayIcon trayIcon = new TrayIcon(new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB), "Notification Helper");
+        SystemTray.getSystemTray().add(trayIcon);
+        trayIcon.displayMessage(notificationTitle, msg, TrayIcon.MessageType.INFO);
+        return trayIcon;
+    }
+}