Add closeable webhook

telegrambots/src/main/java/org/telegram/telegrambots/updatesreceivers/DefaultWebhook.java

@@ -1,5 +1,8 @@
 package org.telegram.telegrambots.updatesreceivers;
 
+import java.io.Closeable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
 import org.glassfish.grizzly.http.server.HttpServer;
 import org.glassfish.grizzly.ssl.SSLContextConfigurator;
 import org.glassfish.grizzly.ssl.SSLEngineConfigurator;
@@ -19,12 +22,13 @@ import java.net.URI;
  * @version 1.0
  * Webhook to receive updates
  */
-public class DefaultWebhook implements Webhook {
+public class DefaultWebhook implements Webhook, Closeable {
     private String keystoreServerFile;
     private String keystoreServerPwd;
     private String internalUrl;
 
     private final RestApi restApi;
+    private HttpServer grizzlyServer;
 
     public DefaultWebhook() {
         this.restApi = new RestApi();
@@ -67,6 +71,7 @@ public class DefaultWebhook implements Webhook {
         }
 
         try {
+            this.grizzlyServer = grizzlyServer;
             grizzlyServer.start();
         } catch (IOException e) {
             throw new TelegramApiException("Error starting webhook server", e);
@@ -83,4 +88,16 @@ public class DefaultWebhook implements Webhook {
             throw new TelegramApiException("Can't find or access server keystore file.");
         }
     }
+
+    @Override
+    public void close() throws IOException {
+        try {
+            grizzlyServer.shutdown(1, TimeUnit.MINUTES).get();
+        } catch (ExecutionException ex) {
+            throw new IOException("Failed to stop grizzly server", ex.getCause());
+        } catch (InterruptedException e) {
+            // timeout
+        }
+        grizzlyServer.shutdownNow();
+    }
 }