Revert 272983 "Change Shell / ShellClient to ServiceProvider"

trunk/src/mojo/public/cpp/application/lib/service_connector.h

-// 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_APPLICATION_LIB_SERVICE_CONNECTOR_H_
-#define MOJO_PUBLIC_CPP_APPLICATION_LIB_SERVICE_CONNECTOR_H_
-
-#include <assert.h>
-
-#include <vector>
-
-#include "mojo/public/cpp/bindings/allocation_scope.h"
-#include "mojo/public/interfaces/service_provider/service_provider.mojom.h"
-
-namespace mojo {
-namespace internal {
-
-template <class ServiceImpl, typename Context>
-class ServiceConnector;
-
-// Specialization of ServiceConnection.
-// ServiceImpl: Subclass of InterfaceImpl<...>.
-// Context: Type of shared context.
-template <class ServiceImpl, typename Context>
-class ServiceConnection : public ServiceImpl {
- public:
-  ServiceConnection() : ServiceImpl() {}
-  ServiceConnection(Context* context) : ServiceImpl(context) {}
-
-  virtual void OnConnectionError() MOJO_OVERRIDE {
-    service_connector_->RemoveConnection(static_cast<ServiceImpl*>(this));
-    ServiceImpl::OnConnectionError();
-  }
-
-private:
-  friend class ServiceConnector<ServiceImpl, Context>;
-
-  // Called shortly after this class is instantiated.
-  void set_service_connector(
-      ServiceConnector<ServiceImpl, Context>* connector) {
-    service_connector_ = connector;
-  }
-
-  ServiceConnector<ServiceImpl, Context>* service_connector_;
-};
-
-template <typename ServiceImpl, typename Context>
-struct ServiceConstructor {
-  static ServiceConnection<ServiceImpl, Context>* New(Context* context) {
-    return new ServiceConnection<ServiceImpl, Context>(context);
-  }
-};
-
-template <typename ServiceImpl>
-struct ServiceConstructor<ServiceImpl, void> {
- public:
-  static ServiceConnection<ServiceImpl, void>* New(void* context) {
-    return new ServiceConnection<ServiceImpl, void>();
-  }
-};
-
-class ServiceConnectorBase {
- public:
-  class Owner : public ServiceProvider {
-   public:
-    Owner(ScopedMessagePipeHandle service_provider_handle);
-    virtual ~Owner();
-    ServiceProvider* service_provider() { return service_provider_.get(); }
-    virtual void AddServiceConnector(
-        internal::ServiceConnectorBase* service_connector) = 0;
-    virtual void RemoveServiceConnector(
-        internal::ServiceConnectorBase* service_connector) = 0;
-
-   protected:
-    void set_service_connector_owner(ServiceConnectorBase* service_connector,
-                                     Owner* owner) {
-      service_connector->owner_ = owner;
-    }
-    ServiceProviderPtr service_provider_;
-  };
-  ServiceConnectorBase() : owner_(NULL) {}
-  virtual ~ServiceConnectorBase();
-  ServiceProvider* service_provider() { return owner_->service_provider(); }
-  virtual void ConnectToService(const std::string& url,
-                                ScopedMessagePipeHandle client_handle) = 0;
-
- protected:
-  Owner* owner_;
-};
-
-template <class ServiceImpl, typename Context=void>
-class ServiceConnector : public internal::ServiceConnectorBase {
- public:
-  ServiceConnector(Context* context = NULL) : context_(context) {}
-
-  virtual ~ServiceConnector() {
-    ConnectionList doomed;
-    doomed.swap(connections_);
-    for (typename ConnectionList::iterator it = doomed.begin();
-         it != doomed.end(); ++it) {
-      delete *it;
-    }
-    assert(connections_.empty());  // No one should have added more!
-  }
-
-  virtual void ConnectToService(const std::string& url,
-                                ScopedMessagePipeHandle handle) MOJO_OVERRIDE {
-    ServiceConnection<ServiceImpl, Context>* impl =
-        ServiceConstructor<ServiceImpl, Context>::New(context_);
-    impl->set_service_connector(this);
-    BindToPipe(impl, handle.Pass());
-
-    connections_.push_back(impl);
-  }
-
-  void RemoveConnection(ServiceImpl* impl) {
-    // Called from ~ServiceImpl, in response to a connection error.
-    for (typename ConnectionList::iterator it = connections_.begin();
-         it != connections_.end(); ++it) {
-      if (*it == impl) {
-        delete impl;
-        connections_.erase(it);
-        if (connections_.empty())
-          owner_->RemoveServiceConnector(this);
-        return;
-      }
-    }
-  }
-
-  Context* context() const { return context_; }
-
- private:
-  typedef std::vector<ServiceImpl*> ConnectionList;
-  ConnectionList connections_;
-  Context* context_;
-};
-
-}  // namespace internal
-}  // namespace mojo
-
-#endif  // MOJO_PUBLIC_CPP_APPLICATION_LIB_SERVICE_CONNECTOR_H_