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mojo/public/cpp/bindings/binding.h

Index: mojo/public/cpp/bindings/binding.h
diff --git a/mojo/public/cpp/bindings/binding.h b/mojo/public/cpp/bindings/binding.h
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--- a/mojo/public/cpp/bindings/binding.h
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-// 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_BINDING_H_
-#define MOJO_PUBLIC_CPP_BINDINGS_BINDING_H_
-
-#include <mojo/environment/async_waiter.h>
-
-#include <memory>
-#include <utility>
-
-#include "mojo/public/cpp/bindings/callback.h"
-#include "mojo/public/cpp/bindings/interface_handle.h"
-#include "mojo/public/cpp/bindings/interface_ptr.h"
-#include "mojo/public/cpp/bindings/interface_request.h"
-#include "mojo/public/cpp/bindings/lib/message_header_validator.h"
-#include "mojo/public/cpp/bindings/lib/router.h"
-#include "mojo/public/cpp/environment/logging.h"
-#include "mojo/public/cpp/system/macros.h"
-#include "mojo/public/cpp/system/message_pipe.h"
-
-namespace mojo {
-
-// Represents the binding of an interface implementation to a message pipe.
-// When the |Binding| object is destroyed, the binding between the message pipe
-// and the interface is torn down and the message pipe is closed, leaving the
-// interface implementation in an unbound state.
-//
-// Example:
-//
-//   #include "foo.mojom.h"
-//
-//   class FooImpl : public Foo {
-//    public:
-//     explicit FooImpl(InterfaceRequest<Foo> request)
-//         : binding_(this, request.Pass()) {}
-//
-//     // Foo implementation here.
-//
-//    private:
-//     Binding<Foo> binding_;
-//   };
-//
-// The caller may specify a |MojoAsyncWaiter| to be used by the connection when
-// waiting for calls to arrive. Normally it is fine to use the default waiter.
-// However, the caller may provide their own implementation if needed. The
-// |Binding| will not take ownership of the waiter, and the waiter must outlive
-// the |Binding|. The provided waiter must be able to signal the implementation
-// which generally means it needs to be able to schedule work on the thread the
-// implementation runs on. If writing library code that has to work on different
-// types of threads callers may need to provide different waiter
-// implementations.
-template <typename Interface>
-class Binding {
- public:
-  // Constructs an incomplete binding that will use the implementation |impl|.
-  // The binding may be completed with a subsequent call to the |Bind| method.
-  // Does not take ownership of |impl|, which must outlive the binding.
-  explicit Binding(Interface* impl) : impl_(impl) { stub_.set_sink(impl_); }
-
-  // Constructs a completed binding of message pipe |handle| to implementation
-  // |impl|. Does not take ownership of |impl|, which must outlive the binding.
-  // See class comment for definition of |waiter|.
-  Binding(Interface* impl,
-          ScopedMessagePipeHandle handle,
-          const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
-      : Binding(impl) {
-    Bind(handle.Pass(), waiter);
-  }
-
-  // Constructs a completed binding of |impl| to a new message pipe, passing the
-  // client end to |ptr|, which takes ownership of it. The caller is expected to
-  // pass |ptr| on to the client of the service. Does not take ownership of any
-  // of the parameters. |impl| must outlive the binding. |ptr| only needs to
-  // last until the constructor returns. See class comment for definition of
-  // |waiter|.
-  Binding(Interface* impl,
-          InterfaceHandle<Interface>* interface_handle,
-          const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
-      : Binding(impl) {
-    Bind(interface_handle, waiter);
-  }
-
-  // Constructs a completed binding of |impl| to the message pipe endpoint in
-  // |request|, taking ownership of the endpoint. Does not take ownership of
-  // |impl|, which must outlive the binding. See class comment for definition of
-  // |waiter|.
-  Binding(Interface* impl,
-          InterfaceRequest<Interface> request,
-          const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
-      : Binding(impl) {
-    Bind(request.PassMessagePipe(), waiter);
-  }
-
-  // Tears down the binding, closing the message pipe and leaving the interface
-  // implementation unbound.
-  ~Binding() {}
-
-  // Completes a binding that was constructed with only an interface
-  // implementation. Takes ownership of |handle| and binds it to the previously
-  // specified implementation. See class comment for definition of |waiter|.
-  void Bind(
-      ScopedMessagePipeHandle handle,
-      const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
-    MOJO_DCHECK(!internal_router_);
-
-    internal::MessageValidatorList validators;
-    validators.push_back(std::unique_ptr<internal::MessageValidator>(
-        new internal::MessageHeaderValidator));
-    validators.push_back(std::unique_ptr<internal::MessageValidator>(
-        new typename Interface::RequestValidator_));
-
-    internal_router_.reset(
-        new internal::Router(std::move(handle), std::move(validators), waiter));
-    internal_router_->set_incoming_receiver(&stub_);
-    internal_router_->set_connection_error_handler(
-        [this]() { connection_error_handler_.Run(); });
-  }
-
-  // Completes a binding that was constructed with only an interface
-  // implementation by creating a new message pipe, binding one end of it to the
-  // previously specified implementation, and passing the other to |ptr|, which
-  // takes ownership of it. The caller is expected to pass |ptr| on to the
-  // eventual client of the service. Does not take ownership of |ptr|. See
-  // class comment for definition of |waiter|.
-  void Bind(
-      InterfaceHandle<Interface>* interface_handle,
-      const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
-    MessagePipe pipe;
-    *interface_handle =
-        InterfaceHandle<Interface>(pipe.handle0.Pass(), Interface::Version_);
-    Bind(pipe.handle1.Pass(), waiter);
-  }
-
-  // Completes a binding that was constructed with only an interface
-  // implementation by removing the message pipe endpoint from |request| and
-  // binding it to the previously specified implementation. See class comment
-  // for definition of |waiter|.
-  void Bind(
-      InterfaceRequest<Interface> request,
-      const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
-    Bind(request.PassMessagePipe(), waiter);
-  }
-
-  // Blocks the calling thread until either a call arrives on the previously
-  // bound message pipe, the deadline is exceeded, or an error occurs. Returns
-  // true if a method was successfully read and dispatched.
-  bool WaitForIncomingMethodCall(
-      MojoDeadline deadline = MOJO_DEADLINE_INDEFINITE) {
-    MOJO_DCHECK(internal_router_);
-    return internal_router_->WaitForIncomingMessage(deadline);
-  }
-
-  // Closes the message pipe that was previously bound. Put this object into a
-  // state where it can be rebound to a new pipe.
-  void Close() {
-    MOJO_DCHECK(internal_router_);
-    internal_router_.reset();
-  }
-
-  // Unbinds the underlying pipe from this binding and returns it so it can be
-  // used in another context, such as on another thread or with a different
-  // implementation. Put this object into a state where it can be rebound to a
-  // new pipe.
-  InterfaceRequest<Interface> Unbind() {
-    auto request =
-        InterfaceRequest<Interface>(internal_router_->PassMessagePipe());
-    internal_router_.reset();
-    return request;
-  }
-
-  // Sets an error handler that will be called if a connection error occurs on
-  // the bound message pipe.
-  void set_connection_error_handler(const Closure& error_handler) {
-    connection_error_handler_ = error_handler;
-  }
-
-  // Returns the interface implementation that was previously specified. Caller
-  // does not take ownership.
-  Interface* impl() { return impl_; }
-
-  // Indicates whether the binding has been completed (i.e., whether a message
-  // pipe has been bound to the implementation).
-  bool is_bound() const { return !!internal_router_; }
-
-  // Returns the value of the handle currently bound to this Binding which can
-  // be used to make explicit Wait/WaitMany calls. Requires that the Binding be
-  // bound. Ownership of the handle is retained by the Binding, it is not
-  // transferred to the caller.
-  MessagePipeHandle handle() const {
-    MOJO_DCHECK(is_bound());
-    return internal_router_->handle();
-  }
-
-  // Exposed for testing, should not generally be used.
-  internal::Router* internal_router() { return internal_router_.get(); }
-
- private:
-  std::unique_ptr<internal::Router> internal_router_;
-  typename Interface::Stub_ stub_;
-  Interface* impl_;
-  Closure connection_error_handler_;
-
-  MOJO_DISALLOW_COPY_AND_ASSIGN(Binding);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_BINDINGS_BINDING_H_