host_resolver_proc.h | Explore in Territory

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_DNS_HOST_RESOLVER_PROC_H_
#define NET_DNS_HOST_RESOLVER_PROC_H_

#include <string>

#include "base/memory/ref_counted.h"
#include "net/base/address_family.h"
#include "net/base/net_export.h"
#include "net/base/network_handle.h"

namespace net {

class AddressList;

// Interface for a getaddrinfo()-like procedure. This is used by tests
// to control the underlying resolutions in HostResolverManager.
// HostResolverProcs can be chained together; they fallback to the next
// procedure in the chain by calling ResolveUsingPrevious(). Unless
// `allow_fallback_to_system_or_default` is set to false, `default_proc_`
// (set via SetDefault()) is added to the end of the chain and the actual system
// resolver acts as the final fallback after the default proc.
//
// Note that implementations of HostResolverProc *MUST BE THREADSAFE*, since
// the HostResolver implementation using them can be multi-threaded.
class NET_EXPORT HostResolverProc
    : public base::RefCountedThreadSafe<HostResolverProc> { … };

}  // namespace net

#endif  // NET_DNS_HOST_RESOLVER_PROC_H_
chromium/net/dns/host_resolver_proc.h
