Mojo C++ bindings

mojo/public/bindings/sample/sample_test.cc

+// Copyright 2013 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.
+
+#include <stdio.h>
+
+#include <string>
+
+#include "mojo/public/bindings/sample/generated/sample_service.h"
+#include "mojo/public/bindings/sample/generated/sample_service_proxy.h"
+#include "mojo/public/bindings/sample/generated/sample_service_stub.h"
+
+namespace sample {
+
+static void PrintSpacer(int depth) {
+  for (int i = 0; i < depth; ++i)
+    printf("   ");
+}
+
+static void Print(int depth, const char* name, bool value) {
+  PrintSpacer(depth);
+  printf("%s: %s\n", name, value ? "true" : "false");
+}
+
+static void Print(int depth, const char* name, int32_t value) {
+  PrintSpacer(depth);
+  printf("%s: %d\n", name, value);
+}
+
+static void Print(int depth, const char* name, uint8_t value) {
+  PrintSpacer(depth);
+  printf("%s: %u\n", name, value);
+}
+
+static void Print(int depth, const char* name, mojo::Handle value) {
+  PrintSpacer(depth);
+  printf("%s: 0x%x\n", name, value.value);
+}
+
+static void Print(int depth, const char* name, const mojo::String* str) {
+  PrintSpacer(depth);
+  printf("%s: \"%*s\"\n", name, static_cast<int>(str->size()), &str->at(0));
+}
+
+static void Print(int depth, const char* name, const Bar* bar) {
+  PrintSpacer(depth);
+  printf("%s: %p\n", name, bar);
+  if (bar) {
+    ++depth;
+    Print(depth, "alpha", bar->alpha());
+    Print(depth, "beta", bar->beta());
+    Print(depth, "gamma", bar->gamma());
+    --depth;
+  }
+}
+
+template <typename T>
+static void Print(int depth, const char* name, const mojo::Array<T>* array) {
+  PrintSpacer(depth);
+  printf("%s: %p\n", name, array);
+  if (array) {
+    ++depth;
+    for (size_t i = 0; i < array->size(); ++i) {
+      char buf[32];
+      sprintf(buf, "%lu", static_cast<unsigned long>(i));
+      Print(depth, buf, array->at(i));
+    }
+    --depth;
+  }
+}
+
+static void Print(int depth, const char* name, const Foo* foo) {
+  PrintSpacer(depth);
+  printf("%s: %p\n", name, foo);
+  if (foo) {
+    ++depth;
+    Print(depth, "name", foo->name());
+    Print(depth, "x", foo->x());
+    Print(depth, "y", foo->y());
+    Print(depth, "a", foo->a());
+    Print(depth, "b", foo->b());
+    Print(depth, "c", foo->c());
+    Print(depth, "bar", foo->bar());
+    Print(depth, "extra_bars", foo->extra_bars());
+    Print(depth, "data", foo->data());
+    Print(depth, "files", foo->files());
+    --depth;
+  }
+}
+
+class ServiceImpl : public ServiceStub {
+ public:
+  virtual void Frobinate(const Foo* foo, bool baz, mojo::Handle port)
+      MOJO_OVERRIDE {
+    // Users code goes here to handle the incoming Frobinate message.
+    // We'll just dump the Foo structure and all of its members.
+
+    printf("Frobinate:\n");
+
+    int depth = 1;
+    Print(depth, "foo", foo);
+    Print(depth, "baz", baz);
+    Print(depth, "port", port);
+  }
+};
+
+class SimpleMessageReceiver : public mojo::MessageReceiver {
+ public:
+  virtual bool Accept(mojo::Message* message) MOJO_OVERRIDE {
+    // Imagine some IPC happened here.
+
+    // In the receiving process, an implementation of ServiceStub is known to
+    // the system. It receives the incoming message.
+    ServiceImpl impl;
+
+    ServiceStub* stub = &impl;
+    return stub->Accept(message);
+  }
+};
+
+void Exercise() {
+  SimpleMessageReceiver receiver;
+
+  // User has a proxy to a Service somehow.
+  Service* service = new ServiceProxy(&receiver);
+
+  // User constructs a message to send.
+
+  // Notice that it doesn't matter in what order the structs / arrays are
+  // allocated. Here, the various members of Foo are allocated before Foo is
+  // allocated.
+
+  mojo::ScratchBuffer buf;
+
+  Bar* bar = Bar::New(&buf);
+  bar->set_alpha(20);
+  bar->set_beta(40);
+  bar->set_gamma(60);
+
+  const char kName[] = "foopy";
+  mojo::String* name = mojo::String::NewCopyOf(&buf, std::string(kName));
+
+  mojo::Array<Bar*>* extra_bars = mojo::Array<Bar*>::New(&buf, 3);
+  for (size_t i = 0; i < extra_bars->size(); ++i) {
+    Bar* bar = Bar::New(&buf);
+    uint8_t base = static_cast<uint8_t>(i * 100);
+    bar->set_alpha(base);
+    bar->set_beta(base + 20);
+    bar->set_gamma(base + 40);
+    (*extra_bars)[i] = bar;
+  }
+
+  mojo::Array<uint8_t>* data = mojo::Array<uint8_t>::New(&buf, 10);
+  for (size_t i = 0; i < data->size(); ++i)
+    (*data)[i] = static_cast<uint8_t>(data->size() - i);
+
+  mojo::Array<mojo::Handle>* files = mojo::Array<mojo::Handle>::New(&buf, 4);
+  for (size_t i = 0; i < files->size(); ++i)
+    (*files)[i].value = static_cast<MojoHandle>(0xFFFF - i);
+
+  Foo* foo = Foo::New(&buf);
+  foo->set_name(name);
+  foo->set_x(1);
+  foo->set_y(2);
+  foo->set_a(false);
+  foo->set_b(true);
+  foo->set_c(false);
+  foo->set_bar(bar);
+  foo->set_extra_bars(extra_bars);
+  foo->set_data(data);
+  foo->set_files(files);
+
+  mojo::Handle port = { 10 };
+
+  service->Frobinate(foo, true, port);
+}
+
+}  // namespace sample
+
+int main() {
+  sample::Exercise();
+  return 0;
+}