GWT: Synchronous Code Execution Using Callbacks
@Override
public void onModuleLoad() {
startingHere();
}
void startingHere() {
public void onModuleLoad() {
startingHere();
}
void startingHere() {
callback_To_Execute_And_Wait_Until_It_Returns(new Callback<Integer, String>() {
@Override
public void onFailure(final String reason) {
System.out.println("callback failed because: " + reason);
}
@Override
public void onSuccess(final Integer callback_return_value) {
System.out.println("executed SECOND");
System.out.println("callback result: " + callback_return_value);
do_something_that_requires_the_callback_to_finish_successfully();
}
});
}
void callback_To_Execute_And_Wait_Until_It_Returns(final Callback<Integer, String> cb) {
System.out.println("executed FIRST");
do_something_that_has_to_finish_completely_before_the_callback_succeeds();
final Integer this_might_be_the_return_value_of_the_callback = 42;
cb.onSuccess(this_might_be_the_return_value_of_the_callback);
System.out.println("==============");
}
void do_something_that_requires_the_callback_to_finish_successfully() {
// ...
}
void do_something_that_has_to_finish_completely_before_the_callback_succeeds() {
// ...
}
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