mavenArtifactStalker.groovy

@Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.7.1')

import groovy.json.JsonSlurper
import groovyx.net.http.URIBuilder

def url = buildUrl()
def firstHashCode = fetch(url)
def tenMinutesAsMicroseconds = 10 * 60 * 60 * 1000

for (;firstHashCode == fetch(url);)
{
    println 'Result unchanged; retrying in 10 minutes'
    sleep(tenMinutesAsMicroseconds)
}
println 'Result changed; exiting'

static URL buildUrl ()
{
    def builder = new URIBuilder('http://search.maven.org/')
    builder.path = 'solrsearch/select'
    builder.query = [
        'q':     'g:"org.codehaus.groovy" AND a:"groovy"',
        'core':  'gav',
        'rows':  200,
        'wt':    'json'
    ]
    builder.toString().toURL()
}

static int fetch (URL url)
{
    def data = url.text
    def json = new JsonSlurper().parseText(data)
    HashMap response = json.response
    response.hashCode()
}