Memcached in Grails: a quickie

Two clients will be covered: XMemcached and spymemcached

Xmemcached

Add dependency

Add in BuildConfig.groovy:

dependencies {
  ...
  compile 'com.googlecode.xmemcached:xmemcached:1.4.2'
}

Set up the bean

Add in conf/spring/resources.groovy:

beans = {
  ...
  memcachedClient(net.rubyeye.xmemcached.utils.XMemcachedClientFactoryBean) {
    servers="localhost:11211"
  }
}

Usage in a service

class MyService {
  static final int expiry = 30 // 30s
 
  def memcachedClient
 
  def perform() {
    def val = memcachedClient.get('key')
    if (!val) {
      // cache miss
      ...
      // put in cache
      memcachedClient.set('key', expiry, val)
    }
    // use val
  }
  ...
}

Spy Memcached

Add dependency

Add in BuildConfig.groovy:

dependencies {
  ...
  compile 'net.spy:spymemcached:2.9.1'
}

Set up the bean

Add in conf/spring/resources.groovy:

beans = {
  ...
  memcachedClient(net.spy.memcached.spring.MemcachedClientFactoryBean) {
    servers="localhost:11211"
  }
}

Usage in a service

class MyService {
  static final int expiry = 30 // 30s
 
  def memcachedClient
 
  def perform() {
    def val = memcachedClient.get('key')
    if (!val) {
      // cache miss
      ...
      // put in cache
      memcachedClient.set('key', expiry, val)
    }
    // use val
  }
  ...
}

References

• XMemcached
• spymemcached