WIP on second AggKind

disk/src/agg/streams.rs

@@ -0,0 +1,23 @@
+use crate::streamlog::LogItem;
+use netpod::EventDataReadStats;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum StatsItem {
+    EventDataReadStats(EventDataReadStats),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum StreamItem<T> {
+    DataItem(T),
+    Log(LogItem),
+    Stats(StatsItem),
+}
+
+pub trait Bins {
+    fn bin_count(&self) -> u32;
+}
+
+pub trait Batchable {
+    fn append(&mut self, k: &mut Self);
+}