/**
* The MIT License
* Copyright (c) 2014-2016 Ilkka Seppälä
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.iluwatar.lazy.loading;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* Lazy loading idiom defers object creation until needed.
* <p>
* This example shows different implementations of the pattern with increasing sophistication.
* <p>
* Additional information and lazy loading flavours are described in
* http://martinfowler.com/eaaCatalog/lazyLoad.html
*
*/
public class App {
private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
/**
* Program entry point
*
* @param args command line args
*/
public static void main(String[] args) {
// Simple lazy loader - not thread safe
HolderNaive holderNaive = new HolderNaive();
Heavy heavy = holderNaive.getHeavy();
LOGGER.info("heavy={}", heavy);
// Thread safe lazy loader, but with heavy synchronization on each access
HolderThreadSafe holderThreadSafe = new HolderThreadSafe();
Heavy another = holderThreadSafe.getHeavy();
LOGGER.info("another={}", another);
// The most efficient lazy loader utilizing Java 8 features
Java8Holder java8Holder = new Java8Holder();
Heavy next = java8Holder.getHeavy();
LOGGER.info("next={}", next);
}
}