another way

Author: wzy1935

src/main/java/io/vertx/httpproxy/HttpProxy.java

@@ -21,7 +21,10 @@
 import io.vertx.core.http.RequestOptions;
 import io.vertx.core.net.SocketAddress;
 import io.vertx.httpproxy.impl.ReverseProxy;
+import io.vertx.httpproxy.spi.context.Context;
 
+import java.util.HashMap;
+import java.util.Objects;
 import java.util.function.BiFunction;
 import java.util.function.Function;
 
@@ -114,6 +117,22 @@ default HttpProxy originSelector(Function<HttpServerRequest, Future<SocketAddres
    *
    * @param request the outbound {@code HttpServerRequest}
    */
-  void handle(HttpServerRequest request);
+  default void handle(HttpServerRequest request) {
+    Context defaultContext = new Context() {
+      HashMap<String, Object> data = new HashMap<>();
+      @Override
+      public Object get(String k) {
+        return data.get(k);
+      }
+
+      @Override
+      public void set(String k, Object v) {
+        data.put(k, v);
+      }
+    };
+    handle(request, defaultContext);
+  }
+
+  void handle(HttpServerRequest request, Context n);
 
 }

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

@@ -18,6 +18,7 @@
 import io.vertx.httpproxy.*;
 import io.vertx.httpproxy.cache.CacheOptions;
 import io.vertx.httpproxy.spi.cache.Cache;
+import io.vertx.httpproxy.spi.context.Context;
 
 import java.util.*;
 import java.util.function.BiFunction;
@@ -54,7 +55,7 @@ public HttpProxy addInterceptor(ProxyInterceptor interceptor) {
 
 
   @Override
-  public void handle(HttpServerRequest request) {
+  public void handle(HttpServerRequest request, Context context) {
     ProxyRequest proxyRequest = ProxyRequest.reverseProxy(request);
 
     // Encoding sanity check
@@ -70,7 +71,7 @@ public void handle(HttpServerRequest request) {
       return;
     }
 
-    Proxy proxy = new Proxy(proxyRequest);
+    Proxy proxy = new Proxy(proxyRequest, context);
     proxy.filters = interceptors.listIterator();
     proxy.sendRequest()
       .recover(throwable -> {
@@ -153,16 +154,17 @@ private class Proxy implements ProxyContext {
 
     private final ProxyRequest request;
     private ProxyResponse response;
-    private final Map<String, Object> attachments = new HashMap<>();
+    private final Context attachments;
     private ListIterator<ProxyInterceptor> filters;
 
-    private Proxy(ProxyRequest request) {
+    private Proxy(ProxyRequest request, Context context) {
       this.request = request;
+      this.attachments = context;
     }
 
     @Override
     public void set(String name, Object value) {
-      attachments.put(name, value);
+      attachments.set(name, value);
     }
 
     @Override

src/main/java/io/vertx/httpproxy/spi/context/Context.java

@@ -0,0 +1,7 @@
+package io.vertx.httpproxy.spi.context;
+
+// something like this
+public interface Context {
+  Object get(String k);
+  void set(String k, Object v);
+}