net/dns/mojo_host_resolver_impl.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_DNS_MOJO_HOST_RESOLVER_IMPL_H_
   6 #define NET_DNS_MOJO_HOST_RESOLVER_IMPL_H_
   7
   8 #include <set>
   9
  10 #include "base/macros.h"
  11 #include "base/threading/thread_checker.h"
  12 #include "net/interfaces/host_resolver_service.mojom.h"
  13 #include "net/log/net_log.h"
  14
  15 namespace net {
  16
  17 class HostResolver;
  18
  19 // MojoHostResolverImpl handles mojo host resolution requests. Inbound Mojo
  20 // requests are sent to the HostResolver passed into the constructor. When
  21 // destroyed, any outstanding resolver requests are cancelled. If a request's
  22 // HostResolverRequestClient is shut down, the associated resolver request is
  23 // cancelled.
  24 class MojoHostResolverImpl {
  25  public:
  26   // |resolver| is expected to outlive |this|.
  27   MojoHostResolverImpl(net::HostResolver* resolver, const BoundNetLog& net_log);
  28   ~MojoHostResolverImpl();
  29
  30   void Resolve(interfaces::HostResolverRequestInfoPtr request_info,
  31                interfaces::HostResolverRequestClientPtr client);
  32
  33   bool request_in_progress() { return !pending_jobs_.empty(); }
  34
  35  private:
  36   class Job;
  37
  38   // Removes |job| from the set of pending jobs, and deletes it.
  39   void DeleteJob(Job* job);
  40
  41   // Resolver for resolving incoming requests. Not owned.
  42   net::HostResolver* resolver_;
  43
  44   // The BoundNetLog to be passed to |resolver_| for all requests.
  45   const BoundNetLog net_log_;
  46
  47   // All pending jobs, so they can be cancelled when this service is destroyed.
  48   // Owns all jobs.
  49   std::set<Job*> pending_jobs_;
  50
  51   base::ThreadChecker thread_checker_;
  52
  53   DISALLOW_COPY_AND_ASSIGN(MojoHostResolverImpl);
  54 };
  55
  56 }  // namespace net
  57
  58 #endif  // NET_DNS_MOJO_HOST_RESOLVER_IMPL_H_