EhCache Replication Example

Build

Clone the Repository

git clone https://github.com/skrymets/replicated-cache.git

Build the Project

cd replicated-cache
mvn clean install -DskipTests=true

Build Docker Image

docker image build . -t cache-demo:1.0.0

Play

Run Application's instances in two nodes by Docker Composer

docker-compose.exe up

You will see an output like this

Creating replicated-cache_node1_1 ... done
Creating replicated-cache_node2_1 ... done
Attaching to replicated-cache_node1_1, replicated-cache_node2_1

Node 1 REST Service will start on port 8080
Node 2 REST Service will start on port 8081

Use curl to read/write values from/in cache via the REST interface.

Write a value to the Node 1

curl -X POST -H "key:keyValue" -H "value:valueData" http://localhost:8080/set

node1_1 | 2020-03-24 22:21:18.277 INFO 1 --- [nio-8080-exec-2] s.replicated.cache.shell.RestShell : Setup value for key keyValue == valueData
node1_1 | 2020-03-24 22:21:18.280 INFO 1 --- [nio-8080-exec-2] s.replicated.cache.CachingRepository : Update value in the cache: keyValue: valueData
node2_1 | 2020-03-24 22:21:19.116 DEBUG 1 --- [n(5)-172.17.0.2] n.sf.ehcache.distribution.RMICachePeer : RMICachePeer for cache inMemoryFeatures: remote remove received for key: feature-keyValue

Now read a value by the provided key from the Node 1

curl -X GET http://localhost:8080/read?key=keyValue

You'll get:

valueData

Now read a value by the provided key from the Node 2

curl -X GET http://localhost:8081/read?key=keyValue

And ... magically ... you'll get the same value:

valueData

Explore the logs output in console for more details.

Shutdown the nodes

docker-compose.exe down

Setup Info

EhCache RMI Setup