blob: d04ad20fd06682b537ae0b4f08c98eaf98affc22 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/component_export.h"
#include "base/memory/ref_counted.h"
#include "net/base/completion_once_callback.h"
#include "net/base/net_errors.h"
namespace network {
// Helper class to keep track of multiple functions which may return
// net::ERR_IO_PENDING and call a net::CompletionOnceCallback, or return another
// net error synchronously, and not call the completion callback. If there are
// one or more pending results added, the original completion callback will not
// be called until all those results have completed. If there are multiple error
// results that are different, net::ERR_FAILED will be used.
: public base::RefCounted<PendingCallbackChain> {
explicit PendingCallbackChain(net::CompletionOnceCallback complete);
// Creates a callback that can be called to decrement the wait count if a
// net::ERR_IO_PENDING result is added with AddResult().
net::CompletionOnceCallback CreateCallback();
// Adds a result to the chain. If the result is net::ERR_IO_PENDING,
// a corresponding callback will need to be called before the original
// completion callback is called.
void AddResult(int result);
// Gets the current result of the chain. This will be net::ERR_IO_PENDING if
// there are any pending results.
int GetResult() const;
friend class base::RefCounted<PendingCallbackChain>;
void CallbackComplete(int result);
void SetResult(int result);
int num_waiting_ = 0;
int final_result_ = net::OK;
net::CompletionOnceCallback complete_;
} // namespace network