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// Copyright 2015 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_ASSOCIATED_INTERFACE_PTR_STATE_H_
#define MOJO_PUBLIC_CPP_BINDINGS_LIB_ASSOCIATED_INTERFACE_PTR_STATE_H_
#include <stdint.h>
#include <algorithm> // For |std::swap()|.
#include <utility>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "mojo/public/cpp/bindings/associated_group.h"
#include "mojo/public/cpp/bindings/associated_interface_ptr_info.h"
#include "mojo/public/cpp/bindings/callback.h"
#include "mojo/public/cpp/bindings/lib/control_message_proxy.h"
#include "mojo/public/cpp/bindings/lib/interface_endpoint_client.h"
#include "mojo/public/cpp/bindings/lib/interface_id.h"
#include "mojo/public/cpp/bindings/lib/multiplex_router.h"
#include "mojo/public/cpp/bindings/lib/scoped_interface_endpoint_handle.h"
#include "mojo/public/cpp/system/message_pipe.h"
namespace mojo {
namespace internal {
template <typename Interface>
class AssociatedInterfacePtrState {
public:
AssociatedInterfacePtrState() : version_(0u) {}
~AssociatedInterfacePtrState() {
endpoint_client_.reset();
proxy_.reset();
}
Interface* instance() {
// This will be null if the object is not bound.
return proxy_.get();
}
uint32_t version() const { return version_; }
uint32_t interface_id() const {
DCHECK(is_bound());
return endpoint_client_->interface_id();
}
void QueryVersion(const Callback<void(uint32_t)>& callback) {
// It is safe to capture |this| because the callback won't be run after this
// object goes away.
auto callback_wrapper = [this, callback](uint32_t version) {
this->version_ = version;
callback.Run(version);
};
// Do a static cast in case the interface contains methods with the same
// name.
static_cast<ControlMessageProxy*>(proxy_.get())
->QueryVersion(callback_wrapper);
}
void RequireVersion(uint32_t version) {
if (version <= version_)
return;
version_ = version;
// Do a static cast in case the interface contains methods with the same
// name.
static_cast<ControlMessageProxy*>(proxy_.get())->RequireVersion(version);
}
void Swap(AssociatedInterfacePtrState* other) {
using std::swap;
swap(other->endpoint_client_, endpoint_client_);
swap(other->proxy_, proxy_);
swap(other->version_, version_);
}
void Bind(AssociatedInterfacePtrInfo<Interface> info) {
DCHECK(!endpoint_client_);
DCHECK(!proxy_);
DCHECK_EQ(0u, version_);
DCHECK(info.is_valid());
version_ = info.version();
endpoint_client_.reset(new InterfaceEndpointClient(
AssociatedInterfacePtrInfoHelper::PassHandle(&info), nullptr,
make_scoped_ptr(new typename Interface::ResponseValidator_())));
proxy_.reset(new Proxy(endpoint_client_.get()));
proxy_->serialization_context()->router = endpoint_client_->router();
}
// After this method is called, the object is in an invalid state and
// shouldn't be reused.
AssociatedInterfacePtrInfo<Interface> PassInterface() {
ScopedInterfaceEndpointHandle handle = endpoint_client_->PassHandle();
endpoint_client_.reset();
proxy_.reset();
AssociatedInterfacePtrInfo<Interface> result;
result.set_version(version_);
AssociatedInterfacePtrInfoHelper::SetHandle(&result, std::move(handle));
return result;
}
bool is_bound() const { return !!endpoint_client_; }
bool encountered_error() const {
return endpoint_client_ ? endpoint_client_->encountered_error() : false;
}
void set_connection_error_handler(const Closure& error_handler) {
DCHECK(endpoint_client_);
endpoint_client_->set_connection_error_handler(error_handler);
}
// Returns true if bound and awaiting a response to a message.
bool has_pending_callbacks() const {
return endpoint_client_ && endpoint_client_->has_pending_responders();
}
AssociatedGroup* associated_group() {
return endpoint_client_ ? endpoint_client_->associated_group() : nullptr;
}
private:
using Proxy = typename Interface::Proxy_;
scoped_ptr<InterfaceEndpointClient> endpoint_client_;
scoped_ptr<Proxy> proxy_;
uint32_t version_;
DISALLOW_COPY_AND_ASSIGN(AssociatedInterfacePtrState);
};
} // namespace internal
} // namespace mojo
#endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_ASSOCIATED_INTERFACE_PTR_STATE_H_
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