[bokeh] How to use server_lifecycle?

If you are using "directory format", then you have to pass the *directory* to "bokeh serve", e.g.

  bokeh server --show my_app_dir/

Thanks,

Bryan

···

On Nov 10, 2016, at 7:17 AM, [email protected] wrote:

I found it! I had a feeling that it was a very simple mistake.

I was supposed to call the ``test.py`` of ``main.py`` instead. Then, I should have ran ``bokeh --show test`` from the parent folder (and name the app folder ``test``) and BOOOM. The server calls server_lifecycle.py

Thanks.

On Thursday, November 10, 2016 at 10:06:50 PM UTC+9, [email protected] wrote:
Hi,

I am trying to make a simple example to work using the server_lifecycle.py option, but nothing happens. Am I missing the point?

I have my files test.py and server_lifecycle.py in the same folder.

test.py is like this:

import numpy as np

from bokeh.io import curdoc
from bokeh.models import ColumnDataSource

from bokeh.driving import cosine
from bokeh.plotting import figure, curdoc

### Define Data Sources
t = np.linspace(0, 4*np.pi, 80)
source = ColumnDataSource(dict(t=t, x = np.sin(t)))
                            
#### PLOTS
p = figure(width=900, height=300)
#r1 = p.line([0, 4*pi], [-1, 1], color="firebrick")
r2 = p.line(source=source,x='t', y='x', color="navy", line_width=4)

###
# UPDATES
###

oldT = 4*np.pi

def update(step=0.5):
    global oldT, oldX
    #print step*oldT
    newT = oldT + step
    t = np.linspace(oldT, newT, 80)
    x = np.sin(np.linspace(oldT, newT, 80))
    oldT = newT
    source.stream(dict(t=t, x=x), 1000)

###LAYOUT
page = p

curdoc().add_root(page)
curdoc().add_periodic_callback(update,100)

Then, the life cycle is as follows:

def on_server_loaded(server_context):
    ''' If present, this function is called when the server first starts. '''
    print 'SERVER STARTED'
    print server_context
def on_server_unloaded(server_context):
    ''' If present, this function is called when the server shuts down. '''
    print 'Server down'
    print server_context

def on_session_created(session_context):
    ''' If present, this function is called when a session is created. '''
    print 'Session crated'
    print session_context

def on_session_destroyed(session_context):
    ''' If present, this function is called when a session is closed. '''
    print 'Session Closed'
    print server_context

But nothing is printed in the terminal after I run

bokeh serve --show test.py

Neither during the server starts nor when any session starts.

It fells I am missing something very simple, but I could not find any example on this.

Thank you for the feedback

Mau

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@Bryan, when we run bokeh in directory mode it never seems to consider the server_lifecyle.py file, which is in the same directory as main.py. None of the lines are printed to the console. Any suggestions what could cause this or how to investigate this further? Is there anything specific that we need to add to main.py in order for the server_lifecyle.py to run?

@Harm It’s generally not possible to offer much specific advice without seeing code. If you have a GH repository, etc. that I can look at, I am happy to take a quick look. Otherwise all I can do is refer you to the docs as well as working examples, e.g. app/stocks and app/spectrogram (as well as reiterate the advice above about needing to pass the directory name when running the server)

1 Like

Solved using the example, thanks