[2862] Signal if segment was reset by result

src/lib/datasrc/client_list.cc

@@ -330,7 +330,7 @@ ConfigurableClientList::findInternal(MutableResult& candidate,
     // and the need_updater parameter is true, get the zone there.
 }
 
-void
+bool
 ConfigurableClientList::resetMemorySegment
     (const std::string& datasrc_name,
      ZoneTableSegment::MemorySegmentOpenMode mode,
@@ -340,9 +340,10 @@ ConfigurableClientList::resetMemorySegment
         if (info.name_ == datasrc_name) {
             ZoneTableSegment& segment = *info.ztable_segment_;
             segment.reset(mode, config_params);
-            break;
+            return true;
         }
     }
+    return false;
 }
 
 ConfigurableClientList::ZoneWriterPair

src/lib/datasrc/client_list.h

@@ -385,7 +385,8 @@ public:
     /// \param datasrc_name The name of the data source whose segment to reset
     /// \param mode The open mode for the new memory segment
     /// \param config_params The configuration for the new memory segment.
-    void resetMemorySegment
+    /// \return If the data source was found and reset.
+    bool resetMemorySegment
         (const std::string& datasrc_name,
          memory::ZoneTableSegment::MemorySegmentOpenMode mode,
          isc::data::ConstElementPtr config_params);

src/lib/datasrc/tests/client_list_unittest.cc

@@ -368,7 +368,8 @@ public:
                        const std::string& datasrc_name,
                        ZoneTableSegment::MemorySegmentOpenMode mode,
                        ConstElementPtr config_params) {
-        list.resetMemorySegment(datasrc_name, mode, config_params);
+        EXPECT_TRUE(list.resetMemorySegment(datasrc_name, mode,
+                                            config_params));
     }
     virtual std::string getType() {
         return ("mapped");
@@ -383,6 +384,13 @@ INSTANTIATE_TEST_CASE_P(ListTestMapped, ListTest,
 
 #endif
 
+// Calling reset on empty list finds no data and returns false.
+TEST_P(ListTest, emptyReset) {
+    EXPECT_FALSE(list_->resetMemorySegment("Something",
+                                           memory::ZoneTableSegment::CREATE,
+                                           Element::create()));
+}
+
 // Test the test itself
 TEST_P(ListTest, selfTest) {
     EXPECT_EQ(result::SUCCESS, ds_[0]->findZone(Name("example.org")).code);