Mojo C++ bindings: remove the single-threaded Router.

mojo/public/cpp/bindings/lib/router.h

-// Copyright 2014 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_LIB_ROUTER_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_LIB_ROUTER_H_
-
-#include <stdint.h>
-
-#include <map>
-#include <memory>
-#include <queue>
-
-#include "base/callback.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_checker.h"
-#include "mojo/public/cpp/bindings/bindings_export.h"
-#include "mojo/public/cpp/bindings/connection_error_callback.h"
-#include "mojo/public/cpp/bindings/connector.h"
-#include "mojo/public/cpp/bindings/filter_chain.h"
-#include "mojo/public/cpp/bindings/lib/control_message_handler.h"
-#include "mojo/public/cpp/bindings/lib/control_message_proxy.h"
-#include "mojo/public/cpp/bindings/message.h"
-
-namespace mojo {
-namespace internal {
-
-// TODO(yzshen): Consider removing this class and use MultiplexRouter in all
-// cases. crbug.com/594244
-class MOJO_CPP_BINDINGS_EXPORT Router
-    : NON_EXPORTED_BASE(public MessageReceiverWithResponder) {
- public:
-  Router(ScopedMessagePipeHandle message_pipe,
-         FilterChain filters,
-         bool expects_sync_requests,
-         scoped_refptr<base::SingleThreadTaskRunner> runner,
-         int interface_version);
-  ~Router() override;
-
-  // Sets the receiver to handle messages read from the message pipe that do
-  // not have the Message::kFlagIsResponse flag set.
-  void set_incoming_receiver(MessageReceiverWithResponderStatus* receiver) {
-    incoming_receiver_ = receiver;
-  }
-
-  // Sets the error handler to receive notifications when an error is
-  // encountered while reading from the pipe or waiting to read from the pipe.
-  void set_connection_error_handler(const base::Closure& error_handler) {
-    error_handler_ = error_handler;
-    error_with_reason_handler_.Reset();
-  }
-  void set_connection_error_with_reason_handler(
-      const ConnectionErrorWithReasonCallback& error_handler) {
-    error_with_reason_handler_ = error_handler;
-    error_handler_.Reset();
-  }
-
-  // Returns true if an error was encountered while reading from the pipe or
-  // waiting to read from the pipe.
-  bool encountered_error() const {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return encountered_error_;
-  }
-
-  // Is the router bound to a MessagePipe handle?
-  bool is_valid() const {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return connector_.is_valid();
-  }
-
-  void AddFilter(std::unique_ptr<MessageReceiver> filter);
-
-  // Please note that this method shouldn't be called unless it results from an
-  // explicit request of the user of bindings (e.g., the user sets an
-  // InterfacePtr to null or closes a Binding).
-  void CloseMessagePipe() {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    connector_.CloseMessagePipe();
-  }
-
-  ScopedMessagePipeHandle PassMessagePipe() {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return connector_.PassMessagePipe();
-  }
-
-  void RaiseError() {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    connector_.RaiseError();
-  }
-
-  // MessageReceiver implementation:
-  bool Accept(Message* message) override;
-  bool AcceptWithResponder(Message* message,
-                           MessageReceiver* responder) override;
-
-  // Blocks the current thread until the first incoming method call, i.e.,
-  // either a call to a client method or a callback method, or |deadline|.
-  bool WaitForIncomingMessage(MojoDeadline deadline) {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return connector_.WaitForIncomingMessage(deadline);
-  }
-
-  // See Binding for details of pause/resume.
-  // Note: This doesn't strictly pause incoming calls. If there are
-  // queued messages, they may be dispatched during pause.
-  void PauseIncomingMethodCallProcessing() {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    connector_.PauseIncomingMethodCallProcessing();
-  }
-  void ResumeIncomingMethodCallProcessing() {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    connector_.ResumeIncomingMethodCallProcessing();
-  }
-
-  // Sets this object to testing mode.
-  // In testing mode:
-  // - the object is more tolerant of unrecognized response messages;
-  // - the connector continues working after seeing errors from its incoming
-  //   receiver.
-  void EnableTestingMode();
-
-  MessagePipeHandle handle() const { return connector_.handle(); }
-
-  // Returns true if this Router has any pending callbacks.
-  bool has_pending_responders() const {
-    DCHECK(thread_checker_.CalledOnValidThread());
-    return !async_responders_.empty() || !sync_responses_.empty();
-  }
-
-  ControlMessageProxy* control_message_proxy() {
-    return &control_message_proxy_;
-  }
-
-  bool SimulateReceivingMessageForTesting(Message* message) {
-    return filters_.Accept(message);
-  }
-
- private:
-  // Maps from the id of a response to the MessageReceiver that handles the
-  // response.
-  using AsyncResponderMap =
-      std::map<uint64_t, std::unique_ptr<MessageReceiver>>;
-
-  struct SyncResponseInfo {
-   public:
-    explicit SyncResponseInfo(bool* in_response_received);
-    ~SyncResponseInfo();
-
-    Message response;
-
-    // Points to a stack-allocated variable.
-    bool* response_received;
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(SyncResponseInfo);
-  };
-
-  using SyncResponseMap = std::map<uint64_t, std::unique_ptr<SyncResponseInfo>>;
-
-  class HandleIncomingMessageThunk : public MessageReceiver {
-   public:
-    HandleIncomingMessageThunk(Router* router);
-    ~HandleIncomingMessageThunk() override;
-
-    // MessageReceiver implementation:
-    bool Accept(Message* message) override;
-
-   private:
-    Router* router_;
-  };
-
-  bool HandleIncomingMessage(Message* message);
-  void HandleQueuedMessages();
-  bool HandleMessageInternal(Message* message);
-
-  void OnConnectionError();
-
-  HandleIncomingMessageThunk thunk_;
-  FilterChain filters_;
-  Connector connector_;
-  MessageReceiverWithResponderStatus* incoming_receiver_;
-  AsyncResponderMap async_responders_;
-  SyncResponseMap sync_responses_;
-  uint64_t next_request_id_;
-  bool testing_mode_;
-  std::queue<Message> pending_messages_;
-  // Whether a task has been posted to trigger processing of
-  // |pending_messages_|.
-  bool pending_task_for_messages_;
-  bool encountered_error_;
-  base::Closure error_handler_;
-  ConnectionErrorWithReasonCallback error_with_reason_handler_;
-  ControlMessageProxy control_message_proxy_;
-  ControlMessageHandler control_message_handler_;
-  base::ThreadChecker thread_checker_;
-  base::WeakPtrFactory<Router> weak_factory_;
-};
-
-}  // namespace internal
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ROUTER_H_