log-dropwizard-eureka-mongo-sample

Sample combining some dropwizard standalone apps:

• a eureka server,
• a rest endpoint writing a log entry to a mongo db
• a log producer who discovers the writer via eureka and calls its rest endpoint.
• a log tenacity producer which does the same with hystrix command, scheduled in intervalls with high load.
• a hystrix dashboard where you can see the performance of reads and writes to the rest endpoint.

##Preconditions:

• Java installed properly, 1.6 and above
• Maven installed properly, 3.0.5 and above
• MongoDB installed properly, any recent version should do
• I've only tried it on windows, if you try anything else, please let me know.
• Ports: the following ports are used: 20000, 20001, 20010, 20011, 20012, 20013, 20020, 20021, 20030, 20031, 20040, 20041 If you've some port conflict, search in the .yml files and change numbers, that should do the trick.

##How to set it up:

Start MongoDB by open a console in subfolder mongo

• call: pathtomongo\bin\mongod -f mongolog.conf
• check mongo\mongo.log if mongo is up properly.
• leave console window open until you want to shutdown mongo.

fire up log eureka server

• go into log-eureka-server with a terminal
• run mvn clean package
• fire up server by calling: log-eureka-server.bat
• check if it is running: call http://localhost:20000/eureka/v2/apps
• should give you a nearly empty apps xml document

fire up log writer to mongodb

• go into log-writer with another terminal
• run mvn clean package
• fire up server by calling: log-writer.bat
• checks:
• try out the dropwizard help check. should be fine for all parts: http://localhost:20011/healthcheck {"deadlocks":{"healthy":true},"eureka":{"healthy":true},"logwriter":{"healthy":true},"mongo":{"healthy":true}}
• wait for the service to get registered in eureka, this happens after ~30 seconds (configurable)
• check http://localhost:20000/eureka/v2/apps , it should have the logwriter listed as installed app.
• check http://localhost:20010/log/list should give you an empty list.
• check http://localhost:20010/log?name=samplelogentry should give you a simple result and write a log entry.
• check http://localhost:20010/log/list again, you now should have a log entry.

fire up the log producer

This is for manuall testing, might be helpful at the beginning

• go into log-producer
• run mvn clean package
• fire up server by calling: java -jar target\log-producer-0.0.1.jar server src/main/resources/log-producer.yml
• call http://localhost:20020/produce - it should call log on the log-writer and produce another entry in mongo db.
• check http://localhost:20010/log/list again, there should be one more entry.

fire up the log producer tenacity

This is scheduled massive log-entrys, may conflict with log-producer

• go into log-producer-tenacity
• run mvn clean package
• fire up server by calling: log-producer-tenacity.bat
• call http://localhost:20020/produce - it should call log on the log-writer and produce another entry in mongo db.
• check http://localhost:20010/log/list again, there should be one more entry.

fire up breakerbox

• go to breakerbox\breakerbox-service
• run breakerbox.bat
• call http://localhost:20040 and select production in the top dropdown.
• when log-producer-tenacity is running, you should see charts for read and write.

fire up another writer

• if you wanna see load balaning with ribbon, you can fire up another writer
• fire up server by calling: log-writer2.bat

Stuff used to make this:

• [dropwizard] (http://dropwizard.io/) obviously...
• mongodb for mongodb access
• eureka client&server eureka client and server implemetation
• [tenacity] (https://github.com/yammer/tenacity) & [breakerbox] (https://github.com/yammer/breakerbox) as a quick hystrix and dashbord integration - but maybe I will remove them and integrate archaius and hystrix directly.
• [cron4j] (http://www.sauronsoftware.it/projects/cron4j/) very simple unix-like scheduling framework