diff --git a/items_0/src/collect_s.rs b/items_0/src/collect_s.rs
index 95969fb..abcaaf4 100644
--- a/items_0/src/collect_s.rs
+++ b/items_0/src/collect_s.rs
@@ -135,12 +135,12 @@ where
 }
 
 // TODO rename to `Typed`
-pub trait CollectableType: fmt::Debug + AsAnyRef + AsAnyMut + TypeName + Send {
+pub trait CollectableType: fmt::Debug + WithLen + AsAnyRef + AsAnyMut + TypeName + Send {
     type Collector: CollectorType<Input = Self>;
     fn new_collector() -> Self::Collector;
 }
 
-pub trait Collectable: fmt::Debug + AsAnyRef + AsAnyMut + TypeName + Send {
+pub trait Collectable: fmt::Debug + WithLen + AsAnyRef + AsAnyMut + TypeName + Send {
     fn new_collector(&self) -> Box<dyn Collector>;
 }
 
@@ -171,6 +171,13 @@ impl TypeName for Box<dyn Collectable> {
     }
 }
 
+// TODO do this with some blanket impl:
+impl WithLen for Box<dyn Collectable> {
+    fn len(&self) -> usize {
+        WithLen::len(self.as_ref())
+    }
+}
+
 // TODO do this with some blanket impl:
 impl Collectable for Box<dyn Collectable> {
     fn new_collector(&self) -> Box<dyn Collector> {
@@ -180,7 +187,7 @@ impl Collectable for Box<dyn Collectable> {
 
 impl WithLen for Box<dyn TimeBinned> {
     fn len(&self) -> usize {
-        self.as_ref().len()
+        WithLen::len(self.as_ref())
     }
 }
 
diff --git a/items_0/src/items_0.rs b/items_0/src/items_0.rs
index 407321f..d835f81 100644
--- a/items_0/src/items_0.rs
+++ b/items_0/src/items_0.rs
@@ -141,3 +141,91 @@ impl PartialEq for Box<dyn Events> {
         Events::partial_eq_dyn(self.as_ref(), other.as_ref())
     }
 }
+
+impl EventsNonObj for Box<dyn Events> {
+    fn into_tss_pulses(self: Box<Self>) -> (VecDeque<u64>, VecDeque<u64>) {
+        todo!()
+    }
+}
+
+impl Events for Box<dyn Events> {
+    fn as_time_binnable_mut(&mut self) -> &mut dyn TimeBinnable {
+        todo!()
+    }
+
+    fn verify(&self) -> bool {
+        todo!()
+    }
+
+    fn output_info(&self) {
+        todo!()
+    }
+
+    fn as_collectable_mut(&mut self) -> &mut dyn Collectable {
+        todo!()
+    }
+
+    fn as_collectable_with_default_ref(&self) -> &dyn Collectable {
+        todo!()
+    }
+
+    fn as_collectable_with_default_mut(&mut self) -> &mut dyn Collectable {
+        todo!()
+    }
+
+    fn ts_min(&self) -> Option<u64> {
+        todo!()
+    }
+
+    fn ts_max(&self) -> Option<u64> {
+        todo!()
+    }
+
+    fn take_new_events_until_ts(&mut self, ts_end: u64) -> Box<dyn Events> {
+        todo!()
+    }
+
+    fn new_empty_evs(&self) -> Box<dyn Events> {
+        todo!()
+    }
+
+    fn drain_into_evs(&mut self, dst: &mut Box<dyn Events>, range: (usize, usize)) -> Result<(), MergeError> {
+        todo!()
+    }
+
+    fn find_lowest_index_gt_evs(&self, ts: u64) -> Option<usize> {
+        todo!()
+    }
+
+    fn find_lowest_index_ge_evs(&self, ts: u64) -> Option<usize> {
+        todo!()
+    }
+
+    fn find_highest_index_lt_evs(&self, ts: u64) -> Option<usize> {
+        todo!()
+    }
+
+    fn clone_dyn(&self) -> Box<dyn Events> {
+        todo!()
+    }
+
+    fn partial_eq_dyn(&self, other: &dyn Events) -> bool {
+        todo!()
+    }
+
+    fn serde_id(&self) -> &'static str {
+        todo!()
+    }
+
+    fn nty_id(&self) -> u32 {
+        todo!()
+    }
+
+    fn tss(&self) -> &VecDeque<u64> {
+        todo!()
+    }
+
+    fn pulses(&self) -> &VecDeque<u64> {
+        todo!()
+    }
+}
diff --git a/items_0/src/timebin.rs b/items_0/src/timebin.rs
index c59e743..986bfac 100644
--- a/items_0/src/timebin.rs
+++ b/items_0/src/timebin.rs
@@ -1,4 +1,5 @@
 use crate::collect_s::Collectable;
+use crate::collect_s::Collector;
 use crate::collect_s::ToJsonResult;
 use crate::AsAnyMut;
 use crate::AsAnyRef;
@@ -84,7 +85,9 @@ pub trait TimeBinner: fmt::Debug + Send {
 
 /// Provides a time-binned representation of the implementing type.
 /// In contrast to `TimeBinnableType` this is meant for trait objects.
-pub trait TimeBinnable: fmt::Debug + WithLen + RangeOverlapInfo + Any + AsAnyRef + AsAnyMut + Send {
+pub trait TimeBinnable:
+    fmt::Debug + WithLen + RangeOverlapInfo + Collectable + Any + AsAnyRef + AsAnyMut + Send
+{
     // TODO implementors may fail if edges contain not at least 2 entries.
     fn time_binner_new(&self, binrange: BinnedRangeEnum, do_time_weight: bool) -> Box<dyn TimeBinner>;
     // TODO just a helper for the empty result.
@@ -93,7 +96,7 @@ pub trait TimeBinnable: fmt::Debug + WithLen + RangeOverlapInfo + Any + AsAnyRef
 
 impl WithLen for Box<dyn TimeBinnable> {
     fn len(&self) -> usize {
-        todo!()
+        WithLen::len(self.as_ref())
     }
 }
 
@@ -152,8 +155,8 @@ impl TypeName for Box<dyn TimeBinnable> {
 }
 
 impl Collectable for Box<dyn TimeBinnable> {
-    fn new_collector(&self) -> Box<dyn crate::collect_s::Collector> {
-        todo!()
+    fn new_collector(&self) -> Box<dyn Collector> {
+        self.as_ref().new_collector()
     }
 }
 
diff --git a/items_2/src/channelevents.rs b/items_2/src/channelevents.rs
index 430e91a..084e6c6 100644
--- a/items_2/src/channelevents.rs
+++ b/items_2/src/channelevents.rs
@@ -532,7 +532,7 @@ impl ByteEstimate for ChannelEvents {
 impl Mergeable for ChannelEvents {
     fn ts_min(&self) -> Option<u64> {
         match self {
-            ChannelEvents::Events(k) => k.ts_min(),
+            ChannelEvents::Events(k) => Mergeable::ts_min(k),
             ChannelEvents::Status(k) => match k {
                 Some(k) => Some(k.ts),
                 None => None,
@@ -542,7 +542,7 @@ impl Mergeable for ChannelEvents {
 
     fn ts_max(&self) -> Option<u64> {
         match self {
-            ChannelEvents::Events(k) => k.ts_max(),
+            ChannelEvents::Events(k) => Mergeable::ts_max(k),
             ChannelEvents::Status(k) => match k {
                 Some(k) => Some(k.ts),
                 None => None,
diff --git a/items_2/src/streams.rs b/items_2/src/streams.rs
index 9864297..141c1b4 100644
--- a/items_2/src/streams.rs
+++ b/items_2/src/streams.rs
@@ -3,7 +3,9 @@ use futures_util::FutureExt;
 use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::collect_s::Collectable;
+use items_0::streamitem::RangeCompletableItem;
 use items_0::streamitem::Sitemty;
+use items_0::streamitem::StreamItem;
 use items_0::transform::CollectableStreamTrait;
 use items_0::transform::EventStreamTrait;
 use items_0::transform::EventTransform;
@@ -249,9 +251,23 @@ where
 {
     type Item = Sitemty<Box<dyn Events>>;
 
-    fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
         use Poll::*;
-        todo!()
+        match self.inp.poll_next_unpin(cx) {
+            Ready(Some(item)) => Ready(Some(match item {
+                Ok(item) => Ok(match item {
+                    StreamItem::DataItem(item) => StreamItem::DataItem(match item {
+                        RangeCompletableItem::RangeComplete => RangeCompletableItem::RangeComplete,
+                        RangeCompletableItem::Data(item) => RangeCompletableItem::Data(Box::new(item)),
+                    }),
+                    StreamItem::Log(item) => StreamItem::Log(item),
+                    StreamItem::Stats(item) => StreamItem::Stats(item),
+                }),
+                Err(e) => Err(e),
+            })),
+            Ready(None) => Ready(None),
+            Pending => Pending,
+        }
     }
 }
 
diff --git a/streams/src/collect.rs b/streams/src/collect.rs
index a59558e..3bc2af8 100644
--- a/streams/src/collect.rs
+++ b/streams/src/collect.rs
@@ -1,5 +1,6 @@
 use err::Error;
 use futures_util::Future;
+use futures_util::FutureExt;
 use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::collect_s::Collectable;
@@ -46,28 +47,161 @@ macro_rules! trace4 {
 pub struct Collect {
     inp: CollectableStreamBox,
     deadline: Instant,
+    events_max: u64,
+    range: Option<SeriesRange>,
+    binrange: Option<BinnedRangeEnum>,
+    collector: Option<Box<dyn Collector>>,
+    range_complete: bool,
+    timeout: bool,
+    timer: Pin<Box<dyn Future<Output = ()> + Send>>,
+    done_input: bool,
 }
 
 impl Collect {
-    pub fn new<INP>(inp: INP, deadline: Instant) -> Self
+    pub fn new<INP>(
+        inp: INP,
+        deadline: Instant,
+        events_max: u64,
+        range: Option<SeriesRange>,
+        binrange: Option<BinnedRangeEnum>,
+    ) -> Self
     where
         INP: CollectableStreamTrait + 'static,
     {
+        let timer = tokio::time::sleep_until(deadline.into());
         Self {
             inp: CollectableStreamBox(Box::pin(inp)),
             deadline,
+            events_max,
+            range,
+            binrange,
+            collector: None,
+            range_complete: false,
+            timeout: false,
+            timer: Box::pin(timer),
+            done_input: false,
+        }
+    }
+
+    fn handle_item(&mut self, item: Sitemty<Box<dyn Collectable>>) -> Result<(), Error> {
+        match item {
+            Ok(item) => match item {
+                StreamItem::DataItem(item) => match item {
+                    RangeCompletableItem::RangeComplete => {
+                        self.range_complete = true;
+                        if let Some(coll) = self.collector.as_mut() {
+                            coll.set_range_complete();
+                        } else {
+                            warn!("collect received RangeComplete but no collector yet");
+                        }
+                        Ok(())
+                    }
+                    RangeCompletableItem::Data(mut item) => {
+                        info!("collect sees len {}", item.len());
+                        let coll = self.collector.get_or_insert_with(|| item.new_collector());
+                        coll.ingest(&mut item);
+                        if coll.len() as u64 >= self.events_max {
+                            warn!(
+                                "TODO  compute continue-at  reached events_max {} abort",
+                                self.events_max
+                            );
+                        }
+                        Ok(())
+                    }
+                },
+                StreamItem::Log(item) => {
+                    trace!("collect log {:?}", item);
+                    Ok(())
+                }
+                StreamItem::Stats(item) => {
+                    trace!("collect stats {:?}", item);
+                    match item {
+                        // TODO factor and simplify the stats collection:
+                        StatsItem::EventDataReadStats(_) => {}
+                        StatsItem::RangeFilterStats(_) => {}
+                        StatsItem::DiskStats(item) => match item {
+                            DiskStats::OpenStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::SeekStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::ReadStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::ReadExactStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                        },
+                    }
+                    Ok(())
+                }
+            },
+            Err(e) => {
+                // TODO  Need to use some flags to get good enough error message for remote user.
+                Err(e)
+            }
         }
     }
 }
 
 impl Future for Collect {
-    type Output = Sitemty<Box<dyn Collected>>;
+    type Output = Result<Box<dyn Collected>, Error>;
 
-    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
         use Poll::*;
         let span = tracing::span!(Level::INFO, "Collect");
         let _spg = span.enter();
-        todo!()
+        loop {
+            break if self.done_input {
+                if self.timeout {
+                    if let Some(coll) = self.collector.as_mut() {
+                        coll.set_timed_out();
+                    } else {
+                        warn!("collect timeout but no collector yet");
+                    }
+                }
+                // TODO use range_final and timeout in result.
+                match self.collector.take() {
+                    Some(mut coll) => match coll.result(self.range.clone(), self.binrange.clone()) {
+                        Ok(res) => {
+                            //info!("collect stats total duration: {:?}", total_duration);
+                            Ready(Ok(res))
+                        }
+                        Err(e) => Ready(Err(e)),
+                    },
+                    None => {
+                        let e = Error::with_msg_no_trace(format!("no result because no collector was created"));
+                        error!("{e}");
+                        Ready(Err(e))
+                    }
+                }
+            } else {
+                match self.timer.poll_unpin(cx) {
+                    Ready(()) => {
+                        self.timeout = true;
+                        self.done_input = true;
+                        continue;
+                    }
+                    Pending => match self.inp.0.poll_next_unpin(cx) {
+                        Ready(Some(item)) => match self.handle_item(item) {
+                            Ok(()) => {
+                                continue;
+                            }
+                            Err(e) => {
+                                error!("{e}");
+                                Ready(Err(e))
+                            }
+                        },
+                        Ready(None) => {
+                            self.done_input = true;
+                            continue;
+                        }
+                        Pending => Pending,
+                    },
+                }
+            };
+        }
     }
 }
 
@@ -80,7 +214,7 @@ async fn collect_in_span<T, S>(
 ) -> Result<Box<dyn Collected>, Error>
 where
     S: Stream<Item = Sitemty<T>> + Unpin,
-    T: Collectable + WithLen + fmt::Debug,
+    T: Collectable,
 {
     info!("collect  events_max {events_max}  deadline {deadline:?}");
     let mut collector: Option<Box<dyn Collector>> = None;
diff --git a/streams/src/plaineventsjson.rs b/streams/src/plaineventsjson.rs
index b8f7c1a..6d98778 100644
--- a/streams/src/plaineventsjson.rs
+++ b/streams/src/plaineventsjson.rs
@@ -105,10 +105,9 @@ pub async fn plain_events_json(evq: &PlainEventsQuery, chconf: &ChConf, cluster:
     let stream = PlainEventStream::new(stream);
     let stream = EventsToTimeBinnable::new(stream);
     let stream = TimeBinnableToCollectable::new(stream);
+    let collected = Collect::new(stream, deadline, events_max, Some(evq.range().clone()), None).await;
 
-    // TODO allow Collect to respect events_max and give range to compute continue-at.
     //let collected = crate::collect::collect(stream, deadline, events_max, Some(evq.range().clone()), None).await?;
-    let collected = Collect::new(stream, deadline).await;
     let jsval = serde_json::to_value(&collected)?;
     Ok(jsval)
 }
diff --git a/streams/src/test/collect.rs b/streams/src/test/collect.rs
index f756532..eb67142 100644
--- a/streams/src/test/collect.rs
+++ b/streams/src/test/collect.rs
@@ -1,20 +1,30 @@
+use crate::collect::Collect;
 use crate::test::runfut;
+use crate::transform::EventsToTimeBinnable;
+use crate::transform::TimeBinnableToCollectable;
 use err::Error;
 use futures_util::stream;
 use items_0::streamitem::sitem_data;
+use items_0::streamitem::RangeCompletableItem;
+use items_0::streamitem::StreamItem;
 use items_0::WithLen;
 use items_2::eventsdim0::EventsDim0CollectorOutput;
+use items_2::streams::PlainEventStream;
 use items_2::testgen::make_some_boxed_d0_f32;
 use netpod::timeunits::SEC;
 use std::time::Duration;
 use std::time::Instant;
 
 #[test]
-fn collect_channel_events() -> Result<(), Error> {
+fn collect_channel_events_00() -> Result<(), Error> {
     let fut = async {
         let evs0 = make_some_boxed_d0_f32(20, SEC * 10, SEC * 1, 0, 28736487);
         let evs1 = make_some_boxed_d0_f32(20, SEC * 30, SEC * 1, 0, 882716583);
-        let stream = stream::iter(vec![sitem_data(evs0), sitem_data(evs1)]);
+        let stream = stream::iter(vec![
+            sitem_data(evs0),
+            sitem_data(evs1),
+            Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete)),
+        ]);
         let deadline = Instant::now() + Duration::from_millis(4000);
         let events_max = 10000;
         let res = crate::collect::collect(stream, deadline, events_max, None, None).await?;
@@ -30,3 +40,32 @@ fn collect_channel_events() -> Result<(), Error> {
     };
     runfut(fut)
 }
+
+#[test]
+fn collect_channel_events_01() -> Result<(), Error> {
+    let fut = async {
+        let evs0 = make_some_boxed_d0_f32(20, SEC * 10, SEC * 1, 0, 28736487);
+        let evs1 = make_some_boxed_d0_f32(20, SEC * 30, SEC * 1, 0, 882716583);
+        let stream = stream::iter(vec![
+            sitem_data(evs0),
+            sitem_data(evs1),
+            Ok(StreamItem::DataItem(RangeCompletableItem::RangeComplete)),
+        ]);
+        // TODO build like in request code
+        let deadline = Instant::now() + Duration::from_millis(4000);
+        let events_max = 10000;
+        let stream = PlainEventStream::new(stream);
+        let stream = EventsToTimeBinnable::new(stream);
+        let stream = TimeBinnableToCollectable::new(stream);
+        let res = Collect::new(stream, deadline, events_max, None, None).await?;
+        if let Some(res) = res.as_any_ref().downcast_ref::<EventsDim0CollectorOutput<f32>>() {
+            eprintln!("Great, a match");
+            eprintln!("{res:?}");
+            assert_eq!(res.len(), 40);
+        } else {
+            return Err(Error::with_msg(format!("bad type of collected result")));
+        }
+        Ok(())
+    };
+    runfut(fut)
+}