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use std::fmt::Debug;
pub trait Observer<T, E> {
fn on_next(&mut self, item: T);
fn on_completed(self);
fn on_error(self, error: E);
}
pub struct NextObserver<FnNext> {
pub fn_next: FnNext,
}
pub struct CompletedObserver<FnNext, FnCompleted> {
pub fn_next: FnNext,
pub fn_completed: FnCompleted,
}
pub struct ErrorObserver<FnNext, FnCompleted, FnError> {
pub fn_next: FnNext,
pub fn_completed: FnCompleted,
pub fn_error: FnError,
}
pub struct OptionObserver<FnOption> {
pub fn_option: FnOption
}
pub struct ResultObserver<FnResult> {
pub fn_result: FnResult
}
impl<T, E, FnNext> Observer<T, E> for NextObserver<FnNext>
where E: Debug, FnNext: FnMut(T) {
fn on_next(&mut self, item: T) {
self.fn_next.call_mut((item,));
}
fn on_completed(self) {
}
fn on_error(self, error: E) {
panic!("observer received error: {:?}", error);
}
}
impl<T, E, FnNext, FnCompleted> Observer<T, E> for CompletedObserver<FnNext, FnCompleted>
where E: Debug, FnNext: FnMut(T), FnCompleted: FnOnce() {
fn on_next(&mut self, item: T) {
self.fn_next.call_mut((item,));
}
fn on_completed(self) {
self.fn_completed.call_once(());
}
fn on_error(self, error: E) {
panic!("observer received error: {:?}", error);
}
}
impl<T, E, FnNext, FnCompleted, FnError>
Observer<T, E> for ErrorObserver<FnNext, FnCompleted, FnError>
where FnNext: FnMut(T), FnCompleted: FnOnce(), FnError: FnOnce(E) {
fn on_next(&mut self, item: T) {
self.fn_next.call_mut((item,));
}
fn on_completed(self) {
self.fn_completed.call_once(());
}
fn on_error(self, error: E) {
self.fn_error.call_once((error,));
}
}
impl<T, E, FnOption> Observer<T, E> for OptionObserver<FnOption>
where E: Debug, FnOption: FnMut(Option<T>) {
fn on_next(&mut self, item: T) {
self.fn_option.call_mut((Some(item),));
}
fn on_completed(mut self) {
self.fn_option.call_mut((None,));
}
fn on_error(self, error: E) {
panic!("observer received error: {:?}", error);
}
}
impl<T, E, FnResult> Observer<T, E> for ResultObserver<FnResult>
where FnResult: FnMut(Result<Option<T>, E>) {
fn on_next(&mut self, item: T) {
self.fn_result.call_mut((Ok(Some(item)),));
}
fn on_completed(mut self) {
self.fn_result.call_mut((Ok(None),));
}
fn on_error(mut self, error: E) {
self.fn_result.call_mut((Err(error),));
}
}
pub trait BoxedObserver<T, E>: Observer<T, E> {
fn on_completed_box(self: Box<Self>);
fn on_error_box(self: Box<Self>, error: E);
}
impl<O, T, E> BoxedObserver<T, E> for O where O: Observer<T, E> {
fn on_completed_box(self: Box<Self>) {
self.on_completed();
}
fn on_error_box(self: Box<Self>, error: E) {
self.on_error(error);
}
}