Mojo Example that demos the difference between providing and requesting an interface

examples/indirect_service/integer_service.cc

Index: examples/indirect_service/integer_service.cc
diff --git a/examples/echo/echo_service.cc b/examples/indirect_service/integer_service.cc
similarity index 57%
copy from examples/echo/echo_service.cc
copy to examples/indirect_service/integer_service.cc
index c96f106a688b0d91a9f8f85c3b349ca39c48ffa6..f590438cec6a9c420aee9ac354f53faf55fc7bd1 100644
--- a/examples/echo/echo_service.cc
+++ b/examples/indirect_service/integer_service.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "examples/echo/echo_service.mojom.h"
+#include "examples/indirect_service/indirect_service_demo.mojom.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
@@ -12,30 +12,36 @@
 namespace mojo {
 namespace examples {
 
-class EchoServiceImpl : public InterfaceImpl<EchoService> {
+class IntegerServiceImpl : public InterfaceImpl<IntegerService> {
  public:
-  virtual void EchoString(const String& value,
-                          const Callback<void(String)>& callback) override {
-    callback.Run(value);
+  IntegerServiceImpl() : value_(0) {}
+  virtual ~IntegerServiceImpl() {}
+
+  virtual void Increment(const Callback<void(int32_t)>& callback) override {
+    callback.Run(value_++);
   }
+
+ private:
+  int32_t value_;
 };
 
-class EchoServiceDelegate : public ApplicationDelegate {
+class IntegerServiceAppDelegate : public ApplicationDelegate {
  public:
   virtual bool ConfigureIncomingConnection(
       ApplicationConnection* connection) override {
-    connection->AddService(&echo_service_factory_);
+    connection->AddService(&integer_service_factory_);
     return true;
   }
 
  private:
-  InterfaceFactoryImpl<EchoServiceImpl> echo_service_factory_;
+  InterfaceFactoryImpl<IntegerServiceImpl> integer_service_factory_;
 };
 
 }  // namespace examples
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
-  mojo::ApplicationRunner runner(new mojo::examples::EchoServiceDelegate);
+  mojo::ApplicationRunner runner(new mojo::examples::IntegerServiceAppDelegate);
   return runner.Run(shell_handle);
 }
+