r3570r3 / SimpleMQ

A simple topic-pull message queue with partitioning support.

SimpleMQ

Steps

1. Clear environment. Stop processes and remove existing containers.

docker stop CassandraNode1

docker rm CassandraNode1

2. Build docker image.

docker build -t pubsub.java .

3. Pull cassandra image.

docker pull cassandra

4. Start cassandra instance and wait for it to start.

docker run -p 9042:9042 --rm --name CassandraNode1 -d cassandra

5. Monitor with:

docker logs -f CassandraNode1

and wait for the line:

Created default superuser role 'cassandra'

6. Run sql shell on cassandra cluster.

docker exec -it CassandraNode1 bash -c 'cqlsh'

and create the application keyspace:

CREATE KEYSPACE pubsubkeyspace 
WITH replication = 
{
    'class' : 'SimpleStrategy', 
    'replication_factor' : 1
};

also create the table:

use pubsubkeyspace;

create table if not exists pubsubkeyspace.message (
    topic text,
    partitionId int,
    payload text,
    messageDate timestamp,
    primary key((topic, partitionId), messageDate)
)
with clustering order by (messageDate asc);

7. Get IP and load details.

docker exec -it CassandraNode1 bash -c 'nodetool status'

8. Hit publish URL:

http://localhost:8082/api/v1/publish

and verify data in the DB:

select * from messages;