Add frameType method to Http2Frame.

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2DataFrame.java

@@ -87,6 +87,11 @@ public DefaultHttp2DataFrame stream(Http2FrameStream stream) {
         return this;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.DATA;
+    }
+
     @Override
     public String name() {
         return "DATA";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2GoAwayFrame.java

@@ -83,6 +83,11 @@ public DefaultHttp2GoAwayFrame(long errorCode, ByteBuf content) {
         this.lastStreamId = lastStreamId;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.GO_AWAY;
+    }
+
     @Override
     public String name() {
         return "GOAWAY";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2HeadersFrame.java

@@ -69,6 +69,11 @@ public DefaultHttp2HeadersFrame stream(Http2FrameStream stream) {
         return this;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.HEADERS;
+    }
+
     @Override
     public String name() {
         return "HEADERS";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2PingFrame.java

@@ -42,6 +42,11 @@ public boolean ack() {
         return ack;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.PING;
+    }
+
     @Override
     public String name() {
         return "PING";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2PriorityFrame.java

@@ -54,6 +54,11 @@ public DefaultHttp2PriorityFrame stream(Http2FrameStream stream) {
         return this;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.PRIORITY;
+    }
+
     @Override
     public String name() {
         return "PRIORITY_FRAME";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2PushPromiseFrame.java

@@ -84,6 +84,11 @@ public Http2FrameStream stream() {
         return streamFrame;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.PUSH_PROMISE;
+    }
+
     @Override
     public String name() {
         return "PUSH_PROMISE_FRAME";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2ResetFrame.java

@@ -52,6 +52,11 @@ public DefaultHttp2ResetFrame stream(Http2FrameStream stream) {
         return this;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.RST_STREAM;
+    }
+
     @Override
     public String name() {
         return "RST_STREAM";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2SettingsAckFrame.java

@@ -21,6 +21,12 @@
  * The default {@link Http2SettingsAckFrame} implementation.
  */
 final class DefaultHttp2SettingsAckFrame implements Http2SettingsAckFrame {
+
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.SETTINGS;
+    }
+
     @Override
     public String name() {
         return "SETTINGS(ACK)";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2SettingsFrame.java

@@ -37,6 +37,11 @@ public Http2Settings settings() {
         return settings;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.SETTINGS;
+    }
+
     @Override
     public String name() {
         return "SETTINGS";

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2WindowUpdateFrame.java

@@ -36,6 +36,11 @@ public DefaultHttp2WindowUpdateFrame stream(Http2FrameStream stream) {
         return this;
     }
 
+    @Override
+    public byte frameType() {
+        return Http2FrameTypes.WINDOW_UPDATE;
+    }
+
     @Override
     public String name() {
         return "WINDOW_UPDATE";

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2Frame.java

@@ -15,12 +15,20 @@
  */
 package io.netty.handler.codec.http2;
 
+import io.netty.util.NotImplementedYetException;
 import io.netty.util.internal.UnstableApi;
 
 /** An HTTP/2 frame. */
 @UnstableApi
 public interface Http2Frame {
 
+    /**
+     * Returns the type of the HTTP/2 frame e.g. DATA, GOAWAY, etc.
+     */
+    default byte frameType() {
+        throw new NotImplementedYetException();
+    }
+
     /**
      * Returns the name of the HTTP/2 frame e.g. DATA, GOAWAY, etc.
      */

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2UnknownFrame.java

@@ -28,6 +28,7 @@ public interface Http2UnknownFrame extends Http2StreamFrame, ByteBufHolder {
     @Override
     Http2UnknownFrame stream(Http2FrameStream stream);
 
+    @Override
     byte frameType();
 
     Http2Flags flags();

common/src/main/java/io/netty/util/NotImplementedYetException.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2020 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.netty.util;
+
+public final class NotImplementedYetException extends RuntimeException {
+    public NotImplementedYetException(String message) {
+        super(message);
+    }
+
+    public NotImplementedYetException() {
+        super("Not implemented yet.");
+    }
+}

pom.xml

@@ -1323,6 +1323,12 @@
                   <new>method io.netty.handler.codec.http2.Http2ConnectionHandlerBuilder io.netty.handler.codec.http2.Http2ConnectionHandlerBuilder::decoderEnforceMaxRstFramesPerWindow(int, int)</new>
                   <justification>Acceptable incompatibility for required change, because the method was not previously exposed; protected visiblity in super-class, not made public in final sub-class until now</justification>
                 </item>
+                <item>
+                  <ignore>true</ignore>
+                  <code>java.method.addedToInterface</code>
+                  <new>method byte io.netty.handler.codec.http2.Http2Frame::frameType()</new>
+                  <justification>Acceptable incompatibility for required change</justification>
+                </item>
               </differences>
             </revapi.differences>
           </analysisConfiguration>