This is an example project exploring features of Gemfire

A starbucks client application simulates customers placing CoffeeRequest orders in the system. Barista(Cache)listeners on the servers simulate baristas concurrently picking up CoffeeRequest entries, marking them as in-progress. When they are done with a coffee, they put back PreparedCoffee entries to signal the client that the coffee is ready. The server-side BaristasListeners expose their work-queue statistics which can be queried using a server function. The monitoring client uses this to sample load metrics.

To build and run this project you need to have

• maven 3 installed and on your path
• Gemfire on your path

1. Start the locator and 3 cache instances using: $>./start_caches

2. Start a new terminal for the adminclient to watch for administrative cache events in the cluster and run $>./adminclient

3. Start a new terminal for the monitorclient to sample the barista queues in 2s intervals and run $>./monitorclient

4. Start a new terminal the starbucksclient to simulate customers placing coffee orders and run $>./starbucksclient

Hitting "Enter" ends the applications

• Uses partitioned regions

• The starbucks client that

  • puts CoffeeRequests
  • continuously queries for PreparedCoffees

• CacheListener that listens for CoffeeRequest create events

• Captures statistics in ./target/server/stats.gfsh

• Uses a function to poll for barista work queue metrics

• Uses a custom BaristaStatisticsCollector to aggregate barista metrics from all servers

• Uses a continuous query to listen for PreparedCoffee entries that indicate that the coffee is ready

• Shows how to listen to administrative events like create/destroy regions etc.

$ gfsh -l localhost:40404

gfsh:/>ls
Subregions:
   CoffeeRequests
   PreparedCoffees

gfsh:/>cd PreparedCoffees

gfsh:/PreparedCoffees>pr -b

....

gfsh:/PreparedCoffees>size -m

     Region: /PreparedCoffees
Region Type: Partitioned
Member Id                         Member Name  Region Size
---------                         -----------  -----------
localhost(5476):54487/51669                       157
localhost(7256):44286/51670                       175
localhost(7956):23170/51671                       139

                                        Total:         471