I have a dashboard very similar to this one-
import datetime
import dash
from dash import dcc, html
import plotly
from dash.dependencies import Input, Output
# pip install pyorbital
from pyorbital.orbital import Orbital
satellite = Orbital('TERRA')
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
app.layout = html.Div(
html.Div([
html.H4('TERRA Satellite Live Feed'),
html.Div(id='live-update-text'),
dcc.Graph(id='live-update-graph'),
dcc.Interval(
id='interval-component',
interval=1*1000, # in milliseconds
n_intervals=0
)
])
)
# Multiple components can update everytime interval gets fired.
@app.callback(Output('live-update-graph', 'figure'),
Input('live-update-graph', 'relayout'),
Input('interval-component', 'n_intervals'))
def update_graph_live(relayout, n):
if ctx.triggered_id == 'relayout':
* code that affects the y axis *
return fig
else:
satellite = Orbital('TERRA')
data = {
'time': [],
'Latitude': [],
'Longitude': [],
'Altitude': []
}
# Collect some data
for i in range(180):
time = datetime.datetime.now() - datetime.timedelta(seconds=i*20)
lon, lat, alt = satellite.get_lonlatalt(
time
)
data['Longitude'].append(lon)
data['Latitude'].append(lat)
data['Altitude'].append(alt)
data['time'].append(time)
# Create the graph with subplots
fig = plotly.tools.make_subplots(rows=2, cols=1, vertical_spacing=0.2)
fig['layout']['margin'] = {
'l': 30, 'r': 10, 'b': 30, 't': 10
}
fig['layout']['legend'] = {'x': 0, 'y': 1, 'xanchor': 'left'}
fig.append_trace({
'x': data['time'],
'y': data['Altitude'],
'name': 'Altitude',
'mode': 'lines+markers',
'type': 'scatter'
}, 1, 1)
fig.append_trace({
'x': data['Longitude'],
'y': data['Latitude'],
'text': data['time'],
'name': 'Longitude vs Latitude',
'mode': 'lines+markers',
'type': 'scatter'
}, 2, 1)
return fig
if __name__ == '__main__':
app.run_server(debug=True)
I want to setup a job queue. Right now, the "code that affects the y axis" part never runs because the interval component fires before it finishes processing. I want to setup logic that says "add every callback to a queue and then fire them one at a time in the order that they were called".
Two questions
1- Can I achieve this with celery?
2- If so, what does a small working example look like?
from Can I setup a simple job queue with celery on a plotly dashboard?
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