001/* 002 * Copyright (c) 2015 Maxim Yunusov 003 * Licensed under the Apache License, Version 2.0 (the "License"); 004 * you may not use this file except in compliance with the License. 005 * You may obtain a copy of the License at 006 * 007 * http://www.apache.org/licenses/LICENSE-2.0 008 * 009 * Unless required by applicable law or agreed to in writing, software 010 * distributed under the License is distributed on an "AS IS" BASIS, 011 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 * See the License for the specific language governing permissions and 013 * limitations under the License. 014 */ 015 016package org.maxur.perfmodel.backend.service; 017 018import org.jvnet.hk2.annotations.Contract; 019import org.slf4j.Logger; 020import org.slf4j.LoggerFactory; 021 022import javax.annotation.PostConstruct; 023import javax.inject.Inject; 024 025/** 026 * This interface represents Perfomance Model Standalone Application 027 * 028 * @author myunusov 029 * @version 1.0 030 * @since <pre>30.08.2015</pre> 031 */ 032@Contract 033public abstract class Application { 034 035 private static final Logger LOGGER = LoggerFactory.getLogger(Application.class); 036 037 @Inject 038 private WebServer webServer; 039 040 @Inject 041 private Database db; 042 043 @PostConstruct 044 public final void init() { 045 onInit(); 046 } 047 048 public final void start() { 049 webServer.start(); 050 onStart(); 051 LOGGER.info("Performance Model Calculator Server is started"); 052 } 053 054 public final void stop() { 055 webServer.stop(); 056 db.stop(); 057 onStop(); 058 LOGGER.info("Performance Model Calculator Server is stopped"); 059 } 060 061 public String version() { 062 return this.getClass().getPackage().getImplementationVersion(); 063 } 064 065 066 protected final WebServer webServer() { 067 return webServer; 068 } 069 070 /** 071 * Returns true if Application is applicable. 072 * 073 * @return true if Application is applicable 074 */ 075 public abstract boolean isApplicable(); 076 077 /** 078 * Hook on Init 079 */ 080 protected void onInit() { 081 } 082 083 /** 084 * Hook on Start 085 */ 086 protected void onStart() { 087 } 088 089 /** 090 * Hook on Stop 091 */ 092 protected void onStop() { 093 } 094}