Hook to use execution context #184
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jnumainville
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Jan 23, 2024
The hook can be used to call code within an execution context
It is a fairly niche hook, but here as an example of it being used to do
a table update on a separate thread
```
import deephaven.ui as ui
import threading
from deephaven.execution_context import get_exec_ctx
from deephaven import agg as agg
import deephaven.pandas as dhpd
import deephaven.plot.express as dx
stocks = dx.data.stocks()
def print_sym(source):
print(dhpd.to_pandas(source.update(["Symbol = sym"]) \
.agg_by([agg.avg(cols=["AVG = size"])], by=["Symbol"])))
@ui.component
def exec_ctx_hook(source):
with_exec_ctx = ui.use_execution_context()
def thread_func():
#print_sym(source)
with_exec_ctx(lambda: print_sym(source))
def start_thread():
thread = threading.Thread(target=thread_func)
thread.start()
ui.use_memo(start_thread, source)
return None
exec_hook = exec_ctx_hook(stocks)
```
Fixes #184
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from Bender on #168:
We probably should make a hook just for submitting tasks with the execution context, similar to how I made the use_render_queue hook for submitting tasks on the render thread.
Could be named use_execution_context
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