talk/base/asyncresolverinterface.h

/*
 * libjingle
 * Copyright 2013, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#ifndef TALK_BASE_ASYNCRESOLVERINTERFACE_H_
#define TALK_BASE_ASYNCRESOLVERINTERFACE_H_

#include "talk/base/sigslot.h"
#include "talk/base/socketaddress.h"

namespace talk_base {

// This interface defines the methods to resolve the address asynchronously.
class AsyncResolverInterface {
 public:
  AsyncResolverInterface() {}
  virtual ~AsyncResolverInterface() {}

  // Start address resolve process.
  virtual void Start(const SocketAddress& addr) = 0;
  // Returns top most resolved address of |family|
  virtual bool GetResolvedAddress(int family, SocketAddress* addr) const = 0;
  // Returns error from resolver.
  virtual int GetError() const = 0;
  // Delete the resolver.
  virtual void Destroy(bool wait) = 0;
  // Returns top most resolved IPv4 address if address is resolved successfully.
  // Otherwise returns address set in SetAddress.
  SocketAddress address() const {
    SocketAddress addr;
    GetResolvedAddress(AF_INET, &addr);
    return addr;
  }

  // This signal is fired when address resolve process is completed.
  sigslot::signal1<AsyncResolverInterface*> SignalDone;
};

}  // namespace talk_base

#endif