Feature/destroy filter method (#133)

* Create destroy method

* Create stop method

* Add stop method to ShutdownHook

* Add try/catch/finally to shutdownhook

Author: FionaSprinkles

src/main/java/org/juv25d/App.java

@@ -7,6 +7,7 @@
 import org.juv25d.router.SimpleRouter;
 import org.juv25d.util.ConfigLoader;
 
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 public class App {
@@ -32,7 +33,15 @@ public static void main(String[] args) {
         );
 
         Runtime.getRuntime().addShutdownHook(new Thread(() -> {
-            logger.info("Server shutting down...");
+            logger.info("Shutting down...");
+            try {
+                pipeline.stop();
+                logger.info("Shutdown successful");
+            }catch (Exception ex){
+                logger.log(Level.SEVERE, "Error stopping server", ex);
+            }finally {
+                logger.info("Shutdown hook finished");
+            }
         }));
 
         server.start();

src/main/java/org/juv25d/Pipeline.java

@@ -22,4 +22,8 @@ public FilterChainImpl createChain(HttpRequest request) {
         List<Filter> filters = matcher.match(request);
         return new FilterChainImpl(filters, router);
     }
+
+    public void stop() {
+        matcher.destroy();
+    }
 }

src/main/java/org/juv25d/filter/FilterMatcher.java

@@ -42,4 +42,8 @@ private boolean matches(String pattern, String path) {
 
         return false;
     }
+
+    public void destroy() {
+        registry.shutdown();
+    }
 }