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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/public/c/environment/async_waiter.h"
#include "mojo/public/cpp/bindings/error_handler.h"
#include "mojo/public/cpp/bindings/interface_ptr.h"
#include "mojo/public/cpp/bindings/interface_request.h"
#include "mojo/public/cpp/bindings/lib/filter_chain.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/core.h"
namespace mojo {
// This binds an interface implementation a pipe. Deleting the binding closes
// the pipe.
//
// 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_;
// };
//
// class MyFooFactory : public InterfaceFactory<Foo> {
// public:
// void Create(..., InterfaceRequest<Foo> request) override {
// auto f = new FooImpl(request.Pass());
// // Do something to manage the lifetime of |f|. Use StrongBinding<> to
// // delete FooImpl on connection errors.
// }
// };
template <typename Interface>
class Binding : public ErrorHandler {
public:
using Client = typename Interface::Client;
explicit Binding(Interface* impl) : impl_(impl) { stub_.set_sink(impl_); }
Binding(Interface* impl,
ScopedMessagePipeHandle handle,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
: Binding(impl) {
Bind(handle.Pass(), waiter);
}
Binding(Interface* impl,
InterfacePtr<Interface>* ptr,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
: Binding(impl) {
Bind(ptr, waiter);
}
Binding(Interface* impl,
InterfaceRequest<Interface> request,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter())
: Binding(impl) {
Bind(request.PassMessagePipe(), waiter);
}
~Binding() override {
delete proxy_;
if (internal_router_) {
internal_router_->set_error_handler(nullptr);
delete internal_router_;
}
}
void Bind(
ScopedMessagePipeHandle handle,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
internal::FilterChain filters;
filters.Append<internal::MessageHeaderValidator>();
filters.Append<typename Interface::RequestValidator_>();
filters.Append<typename Client::ResponseValidator_>();
internal_router_ =
new internal::Router(handle.Pass(), filters.Pass(), waiter);
internal_router_->set_incoming_receiver(&stub_);
internal_router_->set_error_handler(this);
proxy_ = new typename Client::Proxy_(internal_router_);
}
void Bind(
InterfacePtr<Interface>* ptr,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
MessagePipe pipe;
ptr->Bind(pipe.handle0.Pass(), waiter);
Bind(pipe.handle1.Pass(), waiter);
}
void Bind(
InterfaceRequest<Interface> request,
const MojoAsyncWaiter* waiter = Environment::GetDefaultAsyncWaiter()) {
Bind(request.PassMessagePipe(), waiter);
}
bool WaitForIncomingMethodCall() {
MOJO_DCHECK(internal_router_);
return internal_router_->WaitForIncomingMessage();
}
void Close() {
MOJO_DCHECK(internal_router_);
internal_router_->CloseMessagePipe();
}
void set_error_handler(ErrorHandler* error_handler) {
error_handler_ = error_handler;
}
// ErrorHandler implementation
void OnConnectionError() override {
if (error_handler_)
error_handler_->OnConnectionError();
}
Interface* impl() { return impl_; }
Client* client() { return proxy_; }
bool is_bound() const { return !!internal_router_; }
// Exposed for testing, should not generally be used.
internal::Router* internal_router() { return internal_router_; }
private:
internal::Router* internal_router_ = nullptr;
typename Client::Proxy_* proxy_ = nullptr;
typename Interface::Stub_ stub_;
Interface* impl_;
ErrorHandler* error_handler_ = nullptr;
MOJO_DISALLOW_COPY_AND_ASSIGN(Binding);
};
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_BINDING_H_
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