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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_SHELL_SERVICE_H_
#define MOJO_PUBLIC_SHELL_SERVICE_H_
#include <vector>
#include "mojo/public/bindings/error_handler.h"
#include "mojo/public/bindings/remote_ptr.h"
#include "mojo/public/system/core_cpp.h"
#include "mojom/shell.h"
// Utility classes for creating ShellClients that vend service instances.
// To use define a class that implements your specific server api, e.g. FooImpl
// to implement a service named Foo. That class must define an empty constructor
// and the Initialize() method.
// class FooImpl : public Foo {
// public:
// FooImpl();
// void Initialize(ServiceFactory<FooImpl>* service_factory,
// ScopedMessagePipeHandle client_handle
// private:
// ServiceFactory<FooImpl>* service_factory_;
// RemotePtr<FooPeer> client_;
// };
//
//
// To simplify further FooImpl can use the Service<> template.
// class FooImpl : public Service<Foo, FooImpl> {
// public:
// FooImpl();
// ...
// <Foo implementation>
// };
//
// Instances of FooImpl will be created by a specialized ServiceFactory
//
// ServiceFactory<FooImpl>
//
// Optionally the classes can be specializeed with a shared context
// class ServiceFactory<FooImpl, MyContext>
// and
// class FooImpl : public Service<Foo, FooImpl, MyContext>
//
// foo_factory = new ServiceFactory<FooImpl, MyContext>(my_context);
// instances of FooImpl can call context() and retrieve the value of my_context.
//
// Lastly create an Application instance that collects all the ServiceFactories.
//
// Application app(shell_handle);
// app.AddServiceFactory(new ServiceFactory<FooImpl>);
//
//
// Specialization of ServiceFactory.
// ServiceImpl: Implementation of Service interface.
// Context: Optional type of shared context.v
//
//
namespace mojo {
namespace internal {
class ServiceFactoryBase {
public:
class Owner : public ShellClient {
public:
Owner(ScopedShellHandle shell_handle);
~Owner();
Shell* shell() { return shell_.get(); }
virtual void AddServiceFactory(
internal::ServiceFactoryBase* service_factory) = 0;
virtual void RemoveServiceFactory(
internal::ServiceFactoryBase* service_factory) = 0;
protected:
void set_service_factory_owner(ServiceFactoryBase* service_factory,
Owner* owner) {
service_factory->owner_ = owner;
}
RemotePtr<Shell> shell_;
};
ServiceFactoryBase() : owner_(NULL) {}
virtual ~ServiceFactoryBase();
Shell* shell() { return owner_->shell(); }
virtual void AcceptConnection(const std::string& url,
ScopedMessagePipeHandle client_handle) = 0;
protected:
Owner* owner_;
};
} // namespace internal
template <class ServiceImpl, typename Context=void>
class ServiceFactory : public internal::ServiceFactoryBase {
public:
ServiceFactory(Context* context = NULL) : context_(context) {}
virtual ~ServiceFactory() {
for (typename ServiceList::iterator it = services_.begin();
it != services_.end(); ++it) {
delete *it;
}
}
virtual void AcceptConnection(const std::string& url,
ScopedMessagePipeHandle client_handle)
MOJO_OVERRIDE {
ServiceImpl* service = new ServiceImpl();
service->Initialize(this, client_handle.Pass());
services_.push_back(service);
}
void RemoveService(ServiceImpl* service) {
for (typename ServiceList::iterator it = services_.begin();
it != services_.end(); ++it) {
if (*it == service) {
services_.erase(it);
delete service;
if (services_.empty())
owner_->RemoveServiceFactory(this);
return;
}
}
}
Context* context() const { return context_; }
private:
typedef std::vector<ServiceImpl*> ServiceList;
ServiceList services_;
Context* context_;
};
// Specialization of ServiceFactory.
// ServiceInterface: Service interface.
// ServiceImpl: Implementation of Service interface.
// Context: Optional type of shared context.
template <class ServiceInterface, class ServiceImpl, typename Context=void>
class Service : public ServiceInterface {
public:
virtual ~Service() {}
protected:
Service() : reaper_(this), service_factory_(NULL) {}
void Initialize(ServiceFactory<ServiceImpl, Context>* service_factory,
ScopedMessagePipeHandle client_handle) {
service_factory_ = service_factory;
client_.reset(
MakeScopedHandle(
InterfaceHandle<typename ServiceInterface::_Peer>(
client_handle.release().value())).Pass(),
this,
&reaper_);
}
Shell* shell() { return service_factory_->shell(); }
Context* context() const { return service_factory_->context(); }
typename ServiceInterface::_Peer* client() { return client_.get(); }
private:
// The Reaper class allows us to handle errors on the client proxy without
// polluting the name space of the Service<> class.
class Reaper : public ErrorHandler {
public:
Reaper(Service<ServiceInterface, ServiceImpl, Context>* service)
: service_(service) {}
virtual void OnError() {
service_->service_factory_->RemoveService(
static_cast<ServiceImpl*>(service_));
}
private:
Service<ServiceInterface, ServiceImpl, Context>* service_;
};
friend class ServiceFactory<ServiceImpl, Context>;
Reaper reaper_;
ServiceFactory<ServiceImpl, Context>* service_factory_;
RemotePtr<typename ServiceInterface::_Peer> client_;
};
} // namespace mojo
#endif // MOJO_PUBLIC_SHELL_SERVICE_H_
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