erangaeb

val employeeHandler = new EmployeeHandler with SprayEmployeeServiceComp with EmployeeDbComp {
  val employeeDb = new EmployeeDb {
    override def createEmployee(employee: Employee) = {
      // mocked employee creation
    }

    override def getEmployee(empId: Int): Employee = {
      // mocked employee retrieve
      Employee(3, "test", "test")
    }

erangaeb

# connect
psql -h <host> -p <port> -U <user>
psql -h dev.localhost -p 15534 -U postgres

# list databases
\list

# connect to database
\connect <databasename>
\connect senz

erangaeb

# grep prints line below and above(10 lines below and above)
git log | grep -C 10 android

# recurisve grep on current folder
grep -R "createEmployee" .

# recursieve grep on .java files
grep -R "createemployee" *.java

# recursive grep on src/ directory

erangaeb

try {
  val database = Database.forURL(databaseUrl, databaseUser, databasePassword, null, databaseDriver)
  database.createSession()
} catch {
  case e: Exception =>
  log.error(e.toString)
}

erangaeb

val ds = new ComboPooledDataSource
ds.setDriverClass(driverName)
ds.setJdbcUrl(dbConfig.getString("url"))
ds.setUser(dbConfig.getString("username"))
ds.setPassword(dbConfig.getString("password"))

// most reliable way, but have visible peformance drop
ds.setTestConnectionOnCheckout(true)

// have better peformacne

erangaeb

# connect to tcp
telnet <host> <post>

telent 10.2.4.110 8080
>>msg

# exit from telnet session
ctrl ]
quit

erangaeb

# format
rsync <options> <source> <destination>

# most commen optaions
-v : verbose
-r : syncs recursively(used when directory backup)
-a : archive mode(altrenative to -r). syncs recursively and preserves symbolic links, special and device files, modification times, group, owner, and permissions
-h : human readable output
-z : comporess files while sync

erangaeb

ssh-keygen -f ~/.ssh/id_rsa -q -P ""

erangaeb

# command
rsunc <options> <remote directory> <local directory>

# usage
rsync -avzh [email protected]:/home/pagero/storage/ /home/eranga/storage/

# directories
/home/pagero/storage/   : Remote directory
/home/eranga/storage/   : Local directory 

erangaeb

# edit crontab file
crontab -e

# rsync as a cron job
30 23 * * * flock -n /tmp/rsync.lock -c "rsync -avzh [email protected]:/home/pagero/storage/ /home/eranga/storage/>/tmp/rsync.log"

# things to notice
1. 30 23                    : Cron job runs everyday 23:30 PM (11.30 PM)
2. flock -n /tmp/rsync.lock : Will prevents to run duplicate cronjobs(means only one cron job will be running)
3. >/tmp/rsync.log          : Will take the output of rsync job to /tmp/rsyn.log file