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// Copyright 2016 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_CONTROLLER_H_
#define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_GROUP_CONTROLLER_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/optional.h"
#include "base/single_thread_task_runner.h"
#include "mojo/public/cpp/bindings/bindings_export.h"
#include "mojo/public/cpp/bindings/disconnect_reason.h"
#include "mojo/public/cpp/bindings/interface_id.h"
#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
namespace mojo {
class InterfaceEndpointClient;
class InterfaceEndpointController;
// An internal interface used to manage endpoints within an associated group,
// which corresponds to one end of a message pipe.
class MOJO_CPP_BINDINGS_EXPORT AssociatedGroupController
: public base::RefCountedThreadSafe<AssociatedGroupController> {
public:
// Associates an interface with this AssociatedGroupController's message pipe.
// It takes ownership of |handle_to_send| and returns an interface ID that
// could be sent by any endpoints within the same associated group.
// If |handle_to_send| is not in pending association state, it returns
// kInvalidInterfaceId. Otherwise, the peer handle of |handle_to_send| joins
// the associated group and is no longer pending.
virtual InterfaceId AssociateInterface(
ScopedInterfaceEndpointHandle handle_to_send) = 0;
// Creates an interface endpoint handle from a given interface ID. The handle
// joins this associated group.
// Typically, this method is used to (1) create an endpoint handle for the
// master interface; or (2) create an endpoint handle on receiving an
// interface ID from the message pipe.
//
// On failure, the method returns an invalid handle. Usually that is because
// the ID has already been used to create a handle.
virtual ScopedInterfaceEndpointHandle CreateLocalEndpointHandle(
InterfaceId id) = 0;
// Closes an interface endpoint handle.
virtual void CloseEndpointHandle(
InterfaceId id,
const base::Optional<DisconnectReason>& reason) = 0;
// Attaches a client to the specified endpoint to send and receive messages.
// The returned object is still owned by the controller. It must only be used
// on the same thread as this call, and only before the client is detached
// using DetachEndpointClient().
virtual InterfaceEndpointController* AttachEndpointClient(
const ScopedInterfaceEndpointHandle& handle,
InterfaceEndpointClient* endpoint_client,
scoped_refptr<base::SingleThreadTaskRunner> runner) = 0;
// Detaches the client attached to the specified endpoint. It must be called
// on the same thread as the corresponding AttachEndpointClient() call.
virtual void DetachEndpointClient(
const ScopedInterfaceEndpointHandle& handle) = 0;
// Raises an error on the underlying message pipe. It disconnects the pipe
// and notifies all interfaces running on this pipe.
virtual void RaiseError() = 0;
protected:
friend class base::RefCountedThreadSafe<AssociatedGroupController>;
// Creates a new ScopedInterfaceEndpointHandle within this associated group.
ScopedInterfaceEndpointHandle CreateScopedInterfaceEndpointHandle(
InterfaceId id);
// Notifies that the interface represented by |handle_to_send| and its peer
// has been associated with this AssociatedGroupController's message pipe, and
// |handle_to_send|'s peer has joined this associated group. (Note: it is the
// peer who has joined the associated group; |handle_to_send| will be sent to
// the remote side.)
// Returns false if |handle_to_send|'s peer has closed.
bool NotifyAssociation(ScopedInterfaceEndpointHandle* handle_to_send,
InterfaceId id);
virtual ~AssociatedGroupController();
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_GROUP_CONTROLLER_H_
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