Fix warning from ClassLoader in sequential compression reader and wri…

…ter (#1299)

- Fix for warning messages "Warning: class_loader.ClassLoader:
SEVERE WARNING!!! Attempting to unload library while objects
created by this loader exist in the heap!"

Signed-off-by: Michael Orlov <michael.orlov@apex.ai>
(cherry picked from commit dded5cf)

rosbag2_compression/include/rosbag2_compression/sequential_compression_reader.hpp

@@ -84,10 +84,10 @@ class ROSBAG2_COMPRESSION_PUBLIC SequentialCompressionReader
    */
   void setup_decompression();
 
-  std::shared_ptr<rosbag2_compression::BaseDecompressorInterface> decompressor_{};
   rosbag2_compression::CompressionMode compression_mode_{
     rosbag2_compression::CompressionMode::NONE};
   std::unique_ptr<rosbag2_compression::CompressionFactory> compression_factory_{};
+  std::shared_ptr<rosbag2_compression::BaseDecompressorInterface> decompressor_{};
 
   rosbag2_storage::StorageOptions storage_options_;
 };

rosbag2_compression/include/rosbag2_compression/sequential_compression_writer.hpp

@@ -181,8 +181,8 @@ class ROSBAG2_COMPRESSION_PUBLIC SequentialCompressionWriter
   virtual void stop_compressor_threads();
 
 private:
-  std::shared_ptr<rosbag2_compression::BaseCompressorInterface> compressor_{};
   std::unique_ptr<rosbag2_compression::CompressionFactory> compression_factory_{};
+  std::shared_ptr<rosbag2_compression::BaseCompressorInterface> compressor_{};
   std::mutex compressor_queue_mutex_;
   std::queue<std::shared_ptr<const rosbag2_storage::SerializedBagMessage>>
   compressor_message_queue_ RCPPUTILS_TSA_GUARDED_BY(compressor_queue_mutex_);