Event-Based Subscription with MongoDB

Jun 24, 2013Download as pptx, pdf4 likes12,587 views

This document discusses using MongoDB for event-based subscription to distribute proprietary content from Citi Velocity. It describes using MongoDB to store user interests and criteria as maps to flexibly match against event data and generate notifications. When a new document is published, a query is constructed to find matching subscription entries based on the event details. Properly structuring the stored criteria as an array of key-value pairs rather than embedded document improves index usage.

$Example Event { title: “Equity Commentary”, region: “North America”, author: “John Smith”, tickers: [“IBM”, “AAPL”], teams: [“GESC”], type: “Commentary” } { _id: 507f1f77bcf86cd799439011 user: “ab23454”, criteria : { region: [“North American”], ticker: [“IBM”] } } Query: {$and : [ $or : [{criteria.author: “John Smith”}, {criteria.author: {$exists:false}}], $or: [{criteria.region: “North America”}, {criteria.region: {$exists:false}}, $or: [{criteria.tickers: {$in:[“IBM”, “AAPL”]}, {criteria.tickers: {$exists:false}}]]} Criteria$

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