Guice 3.0 default provider implementation

Question

I've been using Guice on project, and I'm trying to understand how the default injected providers work. In the "Injecting Providers" section of the manual (https://github.com/google/guice/wiki/InjectingProviders) there's the following simple example:

public class RealBillingService implements BillingService {
  private final Provider<CreditCardProcessor> processorProvider;
  private final Provider<TransactionLog> transactionLogProvider;

  @Inject
  public RealBillingService(Provider<CreditCardProcessor> processorProvider,
      Provider<TransactionLog> transactionLogProvider) {
    this.processorProvider = processorProvider;
    this.transactionLogProvider = transactionLogProvider;
  }

  public Receipt chargeOrder(PizzaOrder order, CreditCard creditCard) {
    CreditCardProcessor processor = processorProvider.get();
    TransactionLog transactionLog = transactionLogProvider.get();

    /* use the processor and transaction log here */
  }
}

Now, what I would like to know is what the default implementations of processorProvider.get() & transactionLogProvider.get() do exactly.

For example:

always create a new instance of CreditCardProcessor/TransactionLog
use an pool of objects
something else..

I'm asking this because I'm currently experincing some odd behaviour in my project that might be explained if the default provider uses some kind of caching strategy..

Thanks

Guice 3.0 default provider implementation

0 Answers0