Make sure Vertx is closed (#290)

* Make sure Vertx is closed

* VertxChannel member vertx cannot be a static.

Author: David Grieve

vertx/src/main/java/com/microsoft/gctoolkit/vertx/VertxChannel.java

@@ -4,9 +4,18 @@
 import com.microsoft.gctoolkit.vertx.io.JVMEventCodec;
 import io.vertx.core.Vertx;
 
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
 public class VertxChannel {
 
-    private Vertx vertx;
+    protected static final Logger LOGGER = Logger.getLogger(VertxChannel.class.getName());
+
+    //
+    // Note well! This cannot be a static final field.
+    // UnifiedJavaVirtualMachineConfigurationTest hangs if it is.
+    //
+    private final Vertx vertx;
 
     {
         //Disable unused Vert.x functionality
@@ -23,4 +32,14 @@ protected Vertx vertx() {
         return vertx;
     }
 
+    public void close() {
+        vertx().close(result -> {
+            if (result.succeeded()) {
+                LOGGER.log(Level.FINE, "Vertx: closed");
+            } else {
+                LOGGER.log(Level.FINE, "Vertx: close failed", result.cause());
+            }
+        });
+    }
+
 }

vertx/src/main/java/com/microsoft/gctoolkit/vertx/VertxDataSourceChannel.java

@@ -35,5 +35,7 @@ public void publish(ChannelName channel, String message) {
     }
 
     @Override
-    public void close() {}
+    public void close() {
+        super.close();
+    }
 }

vertx/src/main/java/com/microsoft/gctoolkit/vertx/VertxJVMEventChannel.java

@@ -15,7 +15,6 @@
 
 public class VertxJVMEventChannel extends VertxChannel implements JVMEventChannel {
 
-    private static final Logger LOGGER = Logger.getLogger(VertxJVMEventChannel.class.getName());
     final private DeliveryOptions options = new DeliveryOptions().setCodecName(JVMEventCodec.NAME);
 
     public VertxJVMEventChannel() {}
@@ -47,5 +46,7 @@ public void publish(ChannelName channel, JVMEvent message) {
     }
 
     @Override
-    public void close() {}
+    public void close() {
+        super.close();
+    }
 }