package io.ebean;
/**
* Execute a TxCallable in a Transaction scope.
* <p>
* Use this with the {@link Ebean#execute(TxCallable)} method.
* </p>
* <p>
* Note that this is basically the same as TxRunnable except that it returns an
* Object (and you specify the return type via generics).
* </p>
* <p>
* See also {@link TxRunnable}.
* </p>
* <p>
* <pre>{@code
*
* Ebean.execute(new TxCallable<String>() {
* public String call() {
* User u1 = Ebean.find(User.class, 1);
* User u2 = Ebean.find(User.class, 2);
*
* u1.setName("u1 mod");
* u2.setName("u2 mod");
*
* Ebean.save(u1);
* Ebean.save(u2);
*
* return u1.getEmail();
* }
* });
*
* }</pre>
*
* @see TxRunnable
*/
public interface TxCallable<T> {
/**
* Execute the method within a transaction scope returning the result.
* <p>
* If you do not want to return a result you should look to use TxRunnable
* instead.
* </p>
*/
T call();
}