Use new resource API.

Motivation:

Vert.x core has introduced new API for resource cleanup.

This project should use it.

Changes:

Use new resource cleanup API.

Author: vietj

src/main/java/io/vertx/httpproxy/impl/CacheImpl.java

@@ -1,16 +1,18 @@
 package io.vertx.httpproxy.impl;
 
 import io.vertx.core.Future;
+import io.vertx.core.internal.Closeable;
 import io.vertx.httpproxy.cache.CacheOptions;
 import io.vertx.httpproxy.spi.cache.Cache;
 import io.vertx.httpproxy.spi.cache.Resource;
 
+import java.time.Duration;
 import java.util.*;
 
 /**
  * Simplistic implementation.
  */
-public class CacheImpl implements Cache {
+public class CacheImpl implements Cache, Closeable {
 
   private final int maxSize;
   private final Map<String, Resource> data;
@@ -43,4 +45,8 @@ public Future<Void> remove(String key) {
     return Future.succeededFuture();
   }
 
+  @Override
+  public Future<Void> shutdown(Duration timeout) {
+    return Future.succeededFuture();
+  }
 }

src/main/java/io/vertx/httpproxy/impl/ReverseProxy.java

@@ -14,7 +14,7 @@
 import io.vertx.core.Vertx;
 import io.vertx.core.buffer.Buffer;
 import io.vertx.core.http.*;
-import io.vertx.core.internal.CloseFuture;
+import io.vertx.core.internal.CloseableResource;
 import io.vertx.core.internal.VertxInternal;
 import io.vertx.core.internal.http.HttpClientInternal;
 import io.vertx.core.internal.logging.Logger;
@@ -51,12 +51,14 @@ public ReverseProxy(ProxyOptions options, HttpClient client) {
 
   public Cache newCache(CacheOptions options, Vertx vertx) {
     if (options.isShared()) {
-      CloseFuture closeFuture = new CloseFuture();
-      return ((VertxInternal) vertx).createSharedResource("__vertx.shared.proxyCache", options.getName(), closeFuture, (cf_) -> {
-        return new CacheImpl(options);
-      });
+      CloseableResource<CacheImpl> resource = ((VertxInternal) vertx).createSharedResource(
+        "__vertx.shared.proxyCache",
+        options.getName(),
+        () -> new CacheImpl(options));
+      return resource.get();
+    } else {
+      return new CacheImpl(options);
     }
-    return new CacheImpl(options);
   }
 
   @Override