[2205] avoid referencing post-destructor member variables.

by a bit ugly hack: we specialize some part of the destructor and make
a local copy of these variables so the tests can inspect them later.

src/bin/auth/datasrc_clients_mgr.h

@@ -128,9 +128,17 @@ public:
             LOG_ERROR(auth_logger, AUTH_DATASRC_CLIENTS_SHUTDOWN_ERROR).
                 arg(ex.what());
         } catch (...) {}
+
+        cleanup();              // see below
     }
 
 private:
+    // This is expected to be called at the end of the destructor.  It
+    // actually does nothing, but provides a customization point for
+    // specialized class for tests so that the tests can inspect the last
+    // state of the class.
+    void cleanup() {}
+
     void sendCommand(datasrc_clientmgr_internal::CommandID command,
                      data::ConstElementPtr arg) {
         {

src/bin/auth/tests/test_datasrc_clients_mgr.cc

@@ -23,8 +23,11 @@ namespace datasrc_clientmgr_internal {
 // Define static DataSrcClientsBuilder member variables.
 bool FakeDataSrcClientsBuilder::started = false;
 std::list<Command>* FakeDataSrcClientsBuilder::command_queue = NULL;
+std::list<Command> FakeDataSrcClientsBuilder::command_queue_copy;
 TestCondVar* FakeDataSrcClientsBuilder::cond = NULL;
+TestCondVar FakeDataSrcClientsBuilder::cond_copy;
 TestMutex* FakeDataSrcClientsBuilder::queue_mutex = NULL;
+TestMutex FakeDataSrcClientsBuilder::queue_mutex_copy;
 bool FakeDataSrcClientsBuilder::thread_waited = false;
 FakeDataSrcClientsBuilder::ExceptionFromWait
 FakeDataSrcClientsBuilder::thread_throw_on_wait =
@@ -43,9 +46,29 @@ TestDataSrcClientsBuilder::doNoop() {
         throw 42;
     }
 }
+} // namespace datasrc_clientmgr_internal
+
+template<>
+void
+TestDataSrcClientsMgr::cleanup() {
+    using namespace datasrc_clientmgr_internal;
+    // Make copy of some of the manager's member variables and reset the
+    // corresponding pointers.  The currently pointed objects are in the
+    // manager object, which are going to be invalidated.
+
+    FakeDataSrcClientsBuilder::command_queue_copy = command_queue_;
+    FakeDataSrcClientsBuilder::command_queue =
+        &FakeDataSrcClientsBuilder::command_queue_copy;
+    FakeDataSrcClientsBuilder::queue_mutex_copy = queue_mutex_;
+    FakeDataSrcClientsBuilder::queue_mutex =
+        &FakeDataSrcClientsBuilder::queue_mutex_copy;
+    FakeDataSrcClientsBuilder::cond_copy = cond_;
+    FakeDataSrcClientsBuilder::cond =
+        &FakeDataSrcClientsBuilder::cond_copy;
 }
-}
-}
+
+} // namespace auth
+} // namespace isc
 
 // Local Variables:
 // mode: c++

src/bin/auth/tests/test_datasrc_clients_mgr.h

@@ -124,9 +124,14 @@ public:
     static bool started;
 
     // These three correspond to the resource shared with the manager.
+    // xxx_copy will be set in the manager's destructor to record the
+    // final state of the manager.
     static std::list<Command>* command_queue;
     static TestCondVar* cond;
     static TestMutex* queue_mutex;
+    static std::list<Command> command_queue_copy;
+    static TestCondVar cond_copy;
+    static TestMutex queue_mutex_copy;
 
     // true iff the manager waited on the thread running the builder.
     static bool thread_waited;
@@ -182,6 +187,13 @@ typedef DataSrcClientsMgrBase<
     datasrc_clientmgr_internal::TestMutex,
     datasrc_clientmgr_internal::TestCondVar> TestDataSrcClientsMgr;
 
+// A specialization of manager's "cleanup" called at the end of the
+// destructor.  We use this to record the final values of some of the class
+// member variables.
+template<>
+void
+TestDataSrcClientsMgr::cleanup();
+
 } // namespace auth
 } // namespace isc