StudentServiceImpl.java

package com.sample.service.service.impl;

import com.liferay.portal.kernel.cache.MultiVMPoolUtil;
import com.liferay.portal.kernel.cache.PortalCache;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.util.Validator;
import com.sample.service.service.base.StudentServiceBaseImpl;
import java.io.Serializable;

public class StudentServiceImpl extends StudentServiceBaseImpl {
    
	private static final Log _log = LogFactoryUtil.getLog(StudentServiceImpl.class);
	public void testCache(String key,String value){
	  
	  /** The below statement will return the cache with the name test
	  If the cache does not exists with the name cache it will create and return it. */
  	PortalCache<Serializable, Serializable> cache = MultiVMPoolUtil.getCache("test");
		
		//Get the value from cache like below
		Serializable serializable = cache.get(key);
		
		/** Here i am checking if the passed key exists or not.
		If does not exists I am putting it in the cache, 
		if it already exists i am getting the value from cache and returning it. */
		if(Validator.isNull(serializable)){
			cache.put(key, value);
			_log.info("added into cache");
		}else{
			_log.info("found in the cache: "+cache.get(key));
		}
	}
}