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// Copyright (c) 2011 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.
#ifndef NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
#define NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
#pragma once
#include "net/base/host_resolver.h"
namespace net {
// This class represents the task of resolving a hostname (or IP address
// literal) to an AddressList object. It wraps HostResolver to resolve only a
// single hostname at a time and cancels this request when going out of scope.
class NET_EXPORT SingleRequestHostResolver {
public:
// |resolver| must remain valid for the lifetime of |this|.
explicit SingleRequestHostResolver(HostResolver* resolver);
// If a completion callback is pending when the resolver is destroyed, the
// host resolution is cancelled, and the completion callback will not be
// called.
~SingleRequestHostResolver();
// Resolves the given hostname (or IP address literal), filling out the
// |addresses| object upon success. See HostResolver::Resolve() for details.
int Resolve(const HostResolver::RequestInfo& info,
AddressList* addresses,
const CompletionCallback& callback,
const BoundNetLog& net_log);
// Cancels the in-progress request, if any. This prevents the callback
// from being invoked. Resolve() can be called again after cancelling.
void Cancel();
private:
// Callback for when the request to |resolver_| completes, so we dispatch
// to the user's callback.
void OnResolveCompletion(int result);
// The actual host resolver that will handle the request.
HostResolver* const resolver_;
// The current request (if any).
HostResolver::RequestHandle cur_request_;
CompletionCallback cur_request_callback_;
// Completion callback for when request to |resolver_| completes.
CompletionCallback callback_;
DISALLOW_COPY_AND_ASSIGN(SingleRequestHostResolver);
};
} // namespace net
#endif // NET_BASE_SINGLE_REQUEST_HOST_RESOLVER_H_
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