Jaeger exporter shutdown (#1150)

Author: esigo

exporters/jaeger/include/opentelemetry/exporters/jaeger/jaeger_exporter.h

@@ -65,10 +65,7 @@ class JaegerExporter final : public opentelemetry::sdk::trace::SpanExporter
    * @param timeout an option timeout, default to max.
    */
   bool Shutdown(
-      std::chrono::microseconds timeout = std::chrono::microseconds::max()) noexcept override
-  {
-    return true;
-  }
+      std::chrono::microseconds timeout = std::chrono::microseconds::max()) noexcept override;
 
 private:
   void InitializeEndpoint();

exporters/jaeger/src/jaeger_exporter.cc

@@ -85,6 +85,12 @@ void JaegerExporter::InitializeEndpoint()
   assert(false);
 }
 
+bool JaegerExporter::Shutdown(std::chrono::microseconds timeout) noexcept
+{
+  is_shutdown_ = true;
+  return true;
+}
+
 }  // namespace jaeger
 }  // namespace exporter
 OPENTELEMETRY_END_NAMESPACE