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// Copyright 2015 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 MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_GROUP_H_
#define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_GROUP_H_
#include <utility>
#include "base/memory/ref_counted.h"
#include "mojo/public/cpp/bindings/associated_interface_ptr_info.h"
#include "mojo/public/cpp/bindings/associated_interface_request.h"
#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
namespace mojo {
class AssociatedGroupController;
// AssociatedGroup refers to all the interface endpoints running at one end of a
// message pipe. It is used to create associated interfaces for that message
// pipe.
// It is thread safe and cheap to make copies.
class AssociatedGroup {
public:
// Configuration used by CreateAssociatedInterface(). Please see the comments
// of that method for more details.
enum AssociatedInterfaceConfig { WILL_PASS_PTR, WILL_PASS_REQUEST };
AssociatedGroup();
AssociatedGroup(const AssociatedGroup& other);
~AssociatedGroup();
AssociatedGroup& operator=(const AssociatedGroup& other);
// |config| indicates whether |ptr_info| or |request| will be sent to the
// remote side of the message pipe.
//
// NOTE: If |config| is |WILL_PASS_REQUEST|, you will want to bind |ptr_info|
// to a local AssociatedInterfacePtr to make calls. However, there is one
// restriction: the pointer should NOT be used to make calls before |request|
// is sent. Violating that will cause the message pipe to be closed. On the
// other hand, as soon as |request| is sent, the pointer is usable. There is
// no need to wait until |request| is bound to an implementation at the remote
// side.
template <typename T>
void CreateAssociatedInterface(
AssociatedInterfaceConfig config,
AssociatedInterfacePtrInfo<T>* ptr_info,
AssociatedInterfaceRequest<T>* request) {
ScopedInterfaceEndpointHandle local;
ScopedInterfaceEndpointHandle remote;
CreateEndpointHandlePair(&local, &remote);
if (!local.is_valid() || !remote.is_valid()) {
*ptr_info = AssociatedInterfacePtrInfo<T>();
*request = AssociatedInterfaceRequest<T>();
return;
}
if (config == WILL_PASS_PTR) {
ptr_info->set_handle(std::move(remote));
// The implementation is local, therefore set the version according to
// the interface definition that this code is built against.
ptr_info->set_version(T::Version_);
request->Bind(std::move(local));
} else {
ptr_info->set_handle(std::move(local));
// The implementation is remote, we don't know about its actual version
// yet.
ptr_info->set_version(0u);
request->Bind(std::move(remote));
}
}
private:
friend class AssociatedGroupController;
void CreateEndpointHandlePair(
ScopedInterfaceEndpointHandle* local_endpoint,
ScopedInterfaceEndpointHandle* remote_endpoint);
scoped_refptr<AssociatedGroupController> controller_;
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_GROUP_H_
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