B'more 911 is a single page app that shows the last 18 months (or so) of 911 calls inside Baltimore City in both a grid and mapped. The 911 call data was courtesy of Open Baltimore.
- Sorting (click on column headers)
- Filtering (using the LIKE operator so its doing a table scan and therefore its a bit slow)
- Map & table are kepts in sync. Clicking on a marker will scroll to and highlight the associated row. Clicking on a row will pan to and highlight the associated marker.
- Data retrieved is limit to the first 500 records of any query.
- Database: Postgres on Amazon RDS
- Server:
- Javascript Backend Implementation: Node, Express, Typescript, Yarn
- Java Backend Implementation: Java 8, SparkJava, JOOQ, Maven
- Client: React, Create-React-App, Yarn
Before running the app, you'll need a config.json in the root that specifies the connection parameters for the RDS database instance. That is not included with the git repo.
Running, building, and testing all require both Node and Yarn be installed. After cloning the repo,
you'll need to run yarn (no parameters) inside both the project root and client directories to download dependencies.
To run in development mode, you'll need to start two processes:
- In project root directory:
yarn start - In client directory, also:
yarn start
Then go to http://localhost:3000.
Both of these processes are using live-reload/watchers to automatically restart/reload as changes are made.
To build, run yarn build in the project root. To then run the build version do node index.js.
Then go to http://localhost:3001.
To run backend tests, in the project root run yarn test. To run client tests, in the client directory also run yarn test.
There is an another backend implementation in Java. It uses Java 8, SparkJava, JOOQ, and Maven.
To run the Java backend, from the java directory, just do: mvn compile exec:java.
The Node and Java backend use the same ports so don't run them simultaneously.