Over a million developers have joined DZone.

Groovy Goodness: Extend ConfigSlurper with Custom Environments Sections

· Java Zone

Discover how AppDynamics steps in to upgrade your performance game and prevent your enterprise from these top 10 Java performance problems, brought to you in partnership with AppDynamics.

Groovy contains the useful ConfigSlurper for reading in configuration files where settings can be different for different environments. We only have to include an environments block and define values for configuration properties per environment. Since Groovy 2.3 we can add our own conditional configuration blocks and therefore don't have to put everything in an environments block.

In the following sample we define our own configuration block servers and use two environments local and prod. We given the propertymail.host different values per environment:

// Configuration script.
def config = '''
// Custom block with setting
// conditional per environment.
servers {
    local {
        mail.host = 'greenmail'
    }

    prod {
        mail.host = 'mail.server'
    }
}

environments {
    local {
        appName = 'local'
    }
    prod {
        appName = 'production'
    }
}
'''

// Helper closure to create a new
// ConfigSlurper for the given environment and
// register servers as section with configuration
// per environment.
def createConfig = { env ->
    def configSlurper = new ConfigSlurper(env)
    configSlurper.registerConditionalBlock('servers', env)
    configSlurper
}

// Create configuration slurper and
// set environment to prod.
def configuration = createConfig('prod').parse(config)

assert configuration.mail.host == 'mail.server'
assert configuration.appName == 'production'


// Create configuration slurper and
// set environment to local.
configuration = createConfig('local').parse(config)

assert configuration.mail.host == 'greenmail'
assert configuration.appName == 'local'

Code written with Groovy 2.3.

The Java Zone is brought to you in partnership with AppDynamics. AppDynamics helps you gain the fundamentals behind application performance, and implement best practices so you can proactively analyze and act on performance problems as they arise, and more specifically with your Java applications. Start a Free Trial.

Topics:

Published at DZone with permission of Hubert Klein Ikkink , DZone MVB .

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}