ipc/attachment_broker.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 IPC_ATTACHMENT_BROKER_H_
   6 #define IPC_ATTACHMENT_BROKER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/process/process_handle.h"
  10 #include "ipc/brokerable_attachment.h"
  11 #include "ipc/ipc_export.h"
  12
  13 namespace IPC {
  14
  15 class AttachmentBroker;
  16 // Classes that inherit from this abstract base class are capable of
  17 // communicating with a broker to send and receive attachments to Chrome IPC
  18 // messages.
  19 class IPC_EXPORT SupportsAttachmentBrokering {
  20  public:
  21   // Returns an AttachmentBroker used to broker attachments of IPC messages to
  22   // other processes. There must be exactly one AttachmentBroker per process.
  23   virtual AttachmentBroker* GetAttachmentBroker() = 0;
  24 };
  25
  26 // Responsible for brokering attachments to Chrome IPC messages. On platforms
  27 // that support attachment brokering, every IPC channel should have a reference
  28 // to a AttachmentBroker.
  29 class IPC_EXPORT AttachmentBroker {
  30  public:
  31   AttachmentBroker() {}
  32   virtual ~AttachmentBroker() {}
  33
  34   // Sends |attachment| to |destination_process|. The implementation uses an
  35   // IPC::Channel to communicate with the broker process. This may be the same
  36   // IPC::Channel that is requesting the brokering of an attachment.
  37   virtual void SendAttachmentToProcess(BrokerableAttachment* attachment,
  38                                        base::ProcessId destination_process) = 0;
  39
  40   // Returns whether the attachment was available. If the attachment was
  41   // available, populates the output parameter |attachment|. The caller then
  42   // becomes the owner of |attachment|.
  43   virtual bool GetAttachmentWithId(BrokerableAttachment::AttachmentId id,
  44                                    BrokerableAttachment* attachment) = 0;
  45
  46  private:
  47   DISALLOW_COPY_AND_ASSIGN(AttachmentBroker);
  48 };
  49
  50 }  // namespace IPC
  51
  52 #endif  // IPC_ATTACHMENT_BROKER_H_