Troop Query
client-side
data fetching & object graph
@garryyao
Problems
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how to cache data?
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how to update query?
Object Graphs
Graph Query
query('section.tasks.steps')
query('camp_section!1')
query('camp_section!1.tasks')
query('camp_section!1.tasks.steps')
query('camp_step!1')
EASY TO HIT
CACHE
Objects Graph is flatten
EASY TO UPDATE
Objects Graph is weakly linked
Troop Query Format
'section!396.tasks@5:10^52525
!396 - ID of the specified section
.tasks - expand the "tasks" property
@5:10 - fetch list only ranged from 5-10
^52525 - modified date later than
when component does .query('...')
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Parse query components to built an AST
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Walk over the AST to check for cached
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Reduce the query to contains only not cached
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Queue the query and batch all queries with an interval
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Actually issue the query and harvest response
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Cache each response object