Mojo: Replace RemotePtr with InterfacePtr and InterfaceImpl

mojo/public/cpp/bindings/lib/interface_ptr_internal.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_BINDINGS_LIB_INTERFACE_PTR_INTERNAL_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_LIB_INTERFACE_PTR_INTERNAL_H_
+
+#include <stdio.h>
+
+#include "mojo/public/cpp/bindings/lib/router.h"
+
+namespace mojo {
+namespace internal {
+
+template <typename Interface>
+class InterfacePtrState {
+ public:
+  InterfacePtrState() : instance_(NULL), client_(NULL), router_(NULL) {}
+
+  ~InterfacePtrState() {
+    // Destruction order matters here. We delete |instance_| 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 instance_;
+    delete router_;
+    delete client_;
+  }
+
+  Interface* instance() const { return instance_; }
+  void set_instance(Interface* instance) { instance_ = instance; }
+
+  Router* router() const { return router_; }
+
+  bool is_configured_as_proxy() const {
+    // This question only makes sense if we have a bound pipe.
+    return router_ && !client_;
+  }
+
+  void Swap(InterfacePtrState* other) {
+    std::swap(other->instance_, instance_);
+    std::swap(other->client_, client_);
+    std::swap(other->router_, router_);
+  }
+
+  void ConfigureProxy(ScopedMessagePipeHandle handle,
+                      MojoAsyncWaiter* waiter = GetDefaultAsyncWaiter()) {
+    assert(!instance_);
+    assert(!router_);
+
+    router_ = new Router(handle.Pass(), waiter);
+    ProxyWithStub* proxy = new ProxyWithStub(router_);
+    router_->set_incoming_receiver(&proxy->stub);
+
+    instance_ = proxy;
+  }
+
+  void ConfigureStub(ScopedMessagePipeHandle handle,
+                     MojoAsyncWaiter* waiter = GetDefaultAsyncWaiter()) {
+    assert(instance_);  // Should have already been set!
+    assert(!router_);
+
+    // Stub for binding to state_.instance
+    // Proxy for communicating to the client on the other end of the pipe.
+
+    router_ = new Router(handle.Pass(), waiter);
+    ClientProxyWithStub* proxy = new ClientProxyWithStub(router_);
+    proxy->stub.set_sink(instance_);
+    router_->set_incoming_receiver(&proxy->stub);
+
+    instance_->SetClient(proxy);
+    client_ = proxy;
+  }
+
+ private:
+  class ProxyWithStub : public Interface::Proxy_ {
+   public:
+    explicit ProxyWithStub(MessageReceiver* receiver)
+        : Interface::Proxy_(receiver) {
+    }
+    virtual void SetClient(typename Interface::Client_* client) MOJO_OVERRIDE {
+      stub.set_sink(client);
+    }
+    typename Interface::Client_::Stub_ stub;
+   private:
+    MOJO_DISALLOW_COPY_AND_ASSIGN(ProxyWithStub);
+  };
+
+  class ClientProxyWithStub : public Interface::Client_::Proxy_ {
+   public:
+    explicit ClientProxyWithStub(MessageReceiver* receiver)
+        : Interface::Client_::Proxy_(receiver) {
+    }
+    typename Interface::Stub_ stub;
+   private:
+    MOJO_DISALLOW_COPY_AND_ASSIGN(ClientProxyWithStub);
+  };
+
+  Interface* instance_;
+  typename Interface::Client_* client_;
+  Router* router_;
+
+  MOJO_DISALLOW_COPY_AND_ASSIGN(InterfacePtrState);
+};
+
+}  // namespace internal
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_INTERFACE_PTR_INTERNAL_H_