Update the RetryPolicy for the GA release, keeping ShouldRetry extension point hidden. (#5771)

* Update the RetryPolicy for the GA release, keeping ShouldRetry extension
point hidden.

* Mark test helper virtual functions private, so they aren't
accessible/callable by callers.

* Update the changelog.

* Update CL.

Author: ahsonkhan

sdk/core/azure-core/CHANGELOG.md

@@ -11,6 +11,7 @@
 ### Other Changes
 
 - Updated JSON library to 3.11.3.
+- Hide methods on the `RetryPolicy` that are not intended for public use.
 
 ## 1.13.0-beta.1 (2024-06-06)
 

sdk/core/azure-core/inc/azure/core/http/policies/policy.hpp

@@ -30,6 +30,14 @@
 #include <utility>
 #include <vector>
 
+#if defined(_azure_TESTING_BUILD)
+// Define the classes used from tests
+namespace Azure { namespace Core { namespace Test {
+  class RetryPolicyTest;
+  class RetryLogic;
+}}} // namespace Azure::Core::Test
+#endif
+
 /**
  * A function that should be implemented and linked to the end-user application in order to override
  * an HTTP transport implementation provided by Azure SDK with custom implementation.
@@ -363,7 +371,16 @@ namespace Azure { namespace Core { namespace Http { namespace Policies {
     /**
      * @brief HTTP retry policy.
      */
-    class RetryPolicy : public HttpPolicy {
+    class RetryPolicy
+#if !defined(_azure_TESTING_BUILD)
+        final
+#endif
+        : public HttpPolicy {
+#if defined(_azure_TESTING_BUILD)
+      // make tests classes friends
+      friend class Azure::Core::Test::RetryPolicyTest;
+      friend class Azure::Core::Test::RetryLogic;
+#endif
     private:
       RetryOptions m_retryOptions;
 
@@ -398,7 +415,7 @@ namespace Azure { namespace Core { namespace Http { namespace Policies {
        */
       static int32_t GetRetryCount(Context const& context);
 
-    protected:
+    private:
       virtual bool ShouldRetryOnTransportFailure(
           RetryOptions const& retryOptions,
           int32_t attempt,