/*
* Copyright 2016 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:
*
* http://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.handler.codec.http2;
import io.netty.util.internal.UnstableApi;
/**
* A frame whose meaning <em>may</em> apply to a particular stream, instead of the entire
* connection. It is still possible for this frame type to apply to the entire connection. In such
* cases, the {@link #streamId()} must return {@code 0}. If the frame applies to a stream, the
* {@link #streamId()} must be greater than zero.
*/
//TODO(buchgr): Do we REALLY need the flexibility of supporting stream id 0? It seems confusing.
@UnstableApi
public interface Http2StreamFrame extends Http2Frame {
/**
* Sets the identifier of the stream this frame applies to. This method may be called at most once.
*
* <p><em>NOTE:</em> This method is supposed to be called by the HTTP/2 transport only. It must not be called by
* users.
*
* @return {@code this}
*/
Http2StreamFrame streamId(int streamId);
/**
* The identifier of the stream this frame applies to.
*
* @return {@code 0} if the frame applies to the entire connection, a value greater than {@code 0} if the frame
* applies to a particular stream, or a value less than {@code 0} if the frame has yet to be associated with
* the connection or a stream.
*/
int streamId();
}