//
//
// Copyright 2018 gRPC authors.
//
// Licensed 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.
//
//

#ifndef GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H
#define GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H

#include <grpc/support/port_platform.h>

#include <stddef.h>

#include "src/core/ext/transport/chttp2/transport/frame.h"
#include "src/core/lib/iomgr/buffer_list.h"
#include "src/core/lib/iomgr/error.h"

namespace grpc_core {
/// A list of RPC Contexts
class ContextList {
 public:
  // Creates a new element with \a context as the value and appends it to the
  // list.
  static void Append(ContextList** head, grpc_chttp2_stream* s);

  // Executes a function \a fn with each context in the list and \a ts. It also
  // frees up the entire list after this operation. It is intended as a callback
  // and hence does not take a ref on \a error
  static void Execute(void* arg, Timestamps* ts, grpc_error_handle error);

 private:
  void* trace_context_ = nullptr;
  ContextList* next_ = nullptr;
  size_t byte_offset_ = 0;
};

void grpc_http2_set_write_timestamps_callback(
    void (*fn)(void*, Timestamps*, grpc_error_handle error));
void grpc_http2_set_fn_get_copied_context(void* (*fn)(void*));
}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_CONTEXT_LIST_H
