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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_LIB_INTERFACE_PTR_INTERNAL_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_INTERFACE_PTR_INTERNAL_H_
#include <algorithm> // For |std::swap()|.
#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"
struct MojoAsyncWaiter;
namespace mojo {
namespace internal {
template <typename Interface>
class InterfacePtrState {
public:
InterfacePtrState() : proxy_(nullptr), router_(nullptr), waiter_(nullptr) {}
~InterfacePtrState() {
// Destruction order matters here. We delete |proxy_| first, even though
// |router_| may have a reference to it, so that |~Interface| may have a
// shot at generating new outbound messages (ie, invoking client methods).
delete proxy_;
delete router_;
}
Interface* instance() {
ConfigureProxyIfNecessary();
// This will be null if the object is not bound.
return proxy_;
}
void Swap(InterfacePtrState* other) {
std::swap(other->proxy_, proxy_);
std::swap(other->router_, router_);
handle_.swap(other->handle_);
std::swap(other->waiter_, waiter_);
}
void Bind(ScopedMessagePipeHandle handle, const MojoAsyncWaiter* waiter) {
MOJO_DCHECK(!proxy_);
MOJO_DCHECK(!router_);
MOJO_DCHECK(!handle_.is_valid());
MOJO_DCHECK(!waiter_);
handle_ = handle.Pass();
waiter_ = waiter;
}
bool WaitForIncomingMethodCall() {
ConfigureProxyIfNecessary();
MOJO_DCHECK(router_);
return router_->WaitForIncomingMessage();
}
ScopedMessagePipeHandle PassMessagePipe() {
if (router_)
return router_->PassMessagePipe();
waiter_ = nullptr;
return handle_.Pass();
}
bool is_bound() const { return handle_.is_valid() || router_; }
void set_client(typename Interface::Client* client) {
ConfigureProxyIfNecessary();
MOJO_DCHECK(proxy_);
proxy_->stub.set_sink(client);
}
bool encountered_error() const {
return router_ ? router_->encountered_error() : false;
}
void set_error_handler(ErrorHandler* error_handler) {
ConfigureProxyIfNecessary();
MOJO_DCHECK(router_);
router_->set_error_handler(error_handler);
}
Router* router_for_testing() {
ConfigureProxyIfNecessary();
return router_;
}
private:
class ProxyWithStub : public Interface::Proxy_ {
public:
explicit ProxyWithStub(MessageReceiverWithResponder* receiver)
: Interface::Proxy_(receiver) {}
typename Interface::Client::Stub_ stub;
private:
MOJO_DISALLOW_COPY_AND_ASSIGN(ProxyWithStub);
};
void ConfigureProxyIfNecessary() {
// The proxy has been configured.
if (proxy_) {
MOJO_DCHECK(router_);
return;
}
// The object hasn't been bound.
if (!waiter_) {
MOJO_DCHECK(!handle_.is_valid());
return;
}
FilterChain filters;
filters.Append<MessageHeaderValidator>();
filters.Append<typename Interface::Client::RequestValidator_>();
filters.Append<typename Interface::ResponseValidator_>();
router_ = new Router(handle_.Pass(), filters.Pass(), waiter_);
waiter_ = nullptr;
ProxyWithStub* proxy = new ProxyWithStub(router_);
router_->set_incoming_receiver(&proxy->stub);
proxy_ = proxy;
}
ProxyWithStub* proxy_;
Router* router_;
// |proxy_| and |router_| are not initialized until read/write with the
// message pipe handle is needed. Before that, |handle_| and |waiter_| store
// the arguments of Bind().
ScopedMessagePipeHandle handle_;
const MojoAsyncWaiter* waiter_;
MOJO_DISALLOW_COPY_AND_ASSIGN(InterfacePtrState);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_INTERFACE_PTR_INTERNAL_H_
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