I am writing a simple JSF application for converting currencies.
There is a Rates
class which holds the data, Currencies
class for managing requests and Manage
class for adding new currencies. My problem is: I want the currencies to be persisted as a property of Rates class hence my use of @ApplicationScoped
. However I can see that Rates
keeps getting reinitialized with every single request. Here's my code of Rates
:
@ManagedBean
@ApplicationScoped
public class Rates {
private Map<String, Double> rates = new HashMap<String, Double>();
private Set<String> currencies = new HashSet<String>(){
{
System.out.println("HashSet initializing");
}
};
private List<String> list = new ArrayList<String>(Arrays.asList("Filip", "Kasia"));
public List<String> getList() {
return list;
}
public void setList(List<String> list) {
this.list = list;
}
public Rates() {
rates.put("PLN_EUR", 0.25);
rates.put("EUR_PLN", 4.0);
currencies.add("PLN");
currencies.add("EUR");
}
public Map<String, Double> getRates() {
return rates;
}
public void setRates(Map<String, Double> rates) {
this.rates = rates;
}
public Set<String> getCurrencies() {
return currencies;
}
public void setCurrencies(Set<String> currencies) {
this.currencies = currencies;
}
public void addRate(String firstCurrency, String secondCurrency){
if(rates.containsKey(firstCurrency + "_" + secondCurrency))
return;
double rate = (double)(Math.random()*10);
rates.put(firstCurrency + "_" + secondCurrency, rate);
rates.put(secondCurrency + "_" + firstCurrency, 1 / rate);
currencies.add(firstCurrency);
currencies.add(secondCurrency);
System.out.println(currencies);
}
public double getRate(String currencies){
return rates.get(currencies);
}
}
and here's how it get's injected:
@ManagedBean
public class Manage {
private String firstCurrency;
private String secondCurrency;
private @Inject Rates rates;
public String getSecondCurrency() {
return secondCurrency;
}
public void setSecondCurrency(String secondCurrency) {
this.secondCurrency = secondCurrency;
}
public String getFirstCurrency() {
return firstCurrency;
}
public void setFirstCurrency(String firstCurrency) {
this.firstCurrency = firstCurrency;
}
public void addCurrencies(){
rates.addRate(firstCurrency, secondCurrency);
}
}
As you can see I added instance initializer for a property of Rates, set currencies
and the text "HashSet initializing" is printed out with every request.