def getAutoIncrementId(String key = "mycounter") {
	def Id = mongoService.getCollection("mycollection").findAndModify([ "key": key ] as BasicDBObject, [ "\$inc": [ "value" : 1 ]] as BasicDBObject)
	return Id?.value?.toInteger()
}

Redis sessions store for Tomcat

Posted: Wed, Mar 9 01:17 AM (PST)

Do you need store your Tomcat sessions in database?

That is solution for you! Redis database is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.

How do I use it?

Download, extract and compile Redis database with:

$ curl -O http://redis.googlecode.com/files/redis-2.2.2.tar.gz
$ tar xzf redis-2.2.2.tar.gz
$ cd redis-2.2.2
$ make

The binaries that are now compiled are available in the src directory. Run Redis with:

$ src/redis-server

You can interact with Redis using the built-in client:

$ src/redis-cli
redis> set foo bar
OK
redis> get foo
"bar"

Our Redis database is ready.

Next step: download the latests build Redis Store for Tomcat at:

http://github.com/xetorthio/RedisStore/downloads

Copy jar into the lib folder of your tomcat installation directory, then edit conf/server.xml file and within your context tag add the following lines:

<Manager className="org.apache.catalina.session.PersistentManager" saveOnRestart="true" maxActiveSessions="1" minIdleSwap="1" maxIdleSwap="1" maxIdleBackup="1">
    <Store className="org.apache.catalina.session.RedisStore" 
        host="localhost"
        port="6379"
        password="something"
        database="0"
    />
</Manager>

Make sure that whatever you store in the session is Serializable.

Tags:

• Java
• Tomcat
• DB