/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.as.quickstarts.datagrid.carmart.session;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Logger;
import javax.enterprise.inject.Model;
import javax.inject.Inject;
import javax.transaction.TransactionManager;
import org.infinispan.CacheImpl;
import org.infinispan.api.BasicCache;
import org.jboss.as.quickstarts.datagrid.carmart.model.Car;
/**
* Adds, retrieves, removes new cars from the cache. Also returns a list of cars
* stored in the cache.
*
* @author Martin Gencur
*
*/
@Model
public class CarManager {
private Logger log = Logger.getLogger(this.getClass().getName());
public static final String CACHE_NAME = "carcache";
public static final String CAR_NUMBERS_KEY = "carnumbers";
@Inject
private CacheContainerProvider provider;
private TransactionManager tm;
private BasicCache<String, Object> carCache;
private String carId;
private Car car = new Car();
public CarManager() {
}
public String addNewCar() {
carCache = provider.getCacheContainer().getCache(CACHE_NAME);
tm = getTransactionManager(carCache);
try {
tm.begin();
List<String> carNumbers = getNumberPlateList(carCache);
carNumbers.add(car.getNumberPlate());
carCache.put(CAR_NUMBERS_KEY, carNumbers);
carCache.put(CarManager.encode(car.getNumberPlate()), car);
tm.commit();
} catch (Exception e) {
if (tm != null) {
try {
tm.rollback();
} catch (Exception e1) {
}
}
}
return "home";
}
public String addNewCarWithRollback() {
boolean throwInducedException = true;
carCache = provider.getCacheContainer().getCache(CACHE_NAME);
tm = getTransactionManager(carCache);
try {
tm.begin();
List<String> carNumbers = getNumberPlateList(carCache);
carNumbers.add(car.getNumberPlate());
//store the new list of car numbers and then throw an exception -> roll-back
//the car number list should not be stored in the cache
carCache.put(CAR_NUMBERS_KEY, carNumbers);
if (throwInducedException) throw new RuntimeException("Induced exception");
carCache.put(CarManager.encode(car.getNumberPlate()), car);
tm.commit();
} catch (Exception e) {
if (tm != null) {
try {
tm.rollback();
log.info("Rolled back due to: " + e.getMessage());
} catch (Exception e1) {
}
}
}
return "home";
}
/**
* Operate on a clone of car number list so that we can demonstrate transaction roll-back.
*/
@SuppressWarnings("unchecked")
private List<String> getNumberPlateList(BasicCache<String, Object> carCacheLoc) {
List<String> result = null;
List<String> carNumberList = (List<String>) carCacheLoc.get(CAR_NUMBERS_KEY);
if (carNumberList == null) {
result = new LinkedList<String>();
} else {
result = new LinkedList<String>(carNumberList);
}
return result;
}
public String showCarDetails(String numberPlate) {
carCache = provider.getCacheContainer().getCache(CACHE_NAME);
tm = getTransactionManager(carCache);
try {
tm.begin();
this.car = (Car) carCache.get(encode(numberPlate));
tm.commit();
} catch (Exception e) {
if (tm != null) {
try {
tm.rollback();
} catch (Exception e1) {
}
}
}
return "showdetails";
}
public List<String> getCarList() {
List<String> result = null;
carCache = provider.getCacheContainer().getCache(CACHE_NAME);
tm = getTransactionManager(carCache);
try {
tm.begin();
// retrieve a list of number plates from the cache
result = getNumberPlateList(carCache);
tm.commit();
} catch (Exception e) {
if (tm != null) {
try {
tm.rollback();
} catch (Exception e1) {
}
}
}
return result;
}
public String removeCar(String numberPlate) {
carCache = provider.getCacheContainer().getCache(CACHE_NAME);
tm = getTransactionManager(carCache);
try {
tm.begin();
carCache.remove(encode(numberPlate));
List<String> carNumbers = getNumberPlateList(carCache);
carNumbers.remove(numberPlate);
carCache.put(CAR_NUMBERS_KEY, carNumbers);
tm.commit();
} catch (Exception e) {
if (tm != null) {
try {
tm.rollback();
} catch (Exception e1) {
}
}
}
return null;
}
private TransactionManager getTransactionManager(BasicCache<?, ?> cache) {
TransactionManager tm = ((CacheImpl) cache).getAdvancedCache().getTransactionManager();
return tm;
}
public void setCarId(String carId) {
this.carId = carId;
}
public String getCarId() {
return carId;
}
public void setCar(Car car) {
this.car = car;
}
public Car getCar() {
return car;
}
public static String encode(String key) {
try {
return URLEncoder.encode(key, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
public static String decode(String key) {
try {
return URLDecoder.decode(key, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
}