import java.io.Closeable;
import java.io.File;
import java.io.IOException;
+import java.io.InputStream;
import java.net.URI;
import java.time.Duration;
import java.util.Collection;
void addClosedListener(Runnable listener);
+ InputStream retrieveAttachment(final String id) throws IOException;
+
@Override
void close() throws IOException;