Examples with Promise org.osgi.util.promise.Promise used on opensource projects

Example 6 with Promise

use of org.osgi.util.promise.Promise in project aries by apache.

the class PromiseImpl method map.

@Override
public <R> Promise<R> map(final Function<? super T, ? extends R> mapper) {
    if (mapper == null)
        throw new NullPointerException();
    final PromiseImpl<R> result = new PromiseImpl<R>(exec, ses);
    then(new Success<T, T>() {

        @Override
        public Promise<T> call(Promise<T> resolved) throws Exception {
            try {
                R val = mapper.apply(resolved.getValue());
                result.resolve(val);
            } catch (Throwable t) {
                result.fail(t);
            }
            return null;
        }
    }, new Failure() {

        @Override
        public void fail(Promise<?> resolved) throws Exception {
            result.fail(resolved.getFailure());
        }
    });
    return result;
}

Example 7 with Promise

use of org.osgi.util.promise.Promise in project aries by apache.

the class PromiseImpl method recoverWith.

@Override
public Promise<T> recoverWith(final Function<Promise<?>, Promise<? extends T>> recovery) {
    if (recovery == null)
        throw new NullPointerException();
    final PromiseImpl<T> result = new PromiseImpl<T>(exec, ses);
    then(new Success<T, T>() {

        @Override
        public Promise<T> call(Promise<T> resolved) throws Exception {
            result.resolve(resolved.getValue());
            return null;
        }
    }, new Failure() {

        @Override
        public void fail(Promise<?> resolved) throws Exception {
            try {
                Promise<? extends T> recover = recovery.apply(resolved);
                if (recover != null) {
                    result.resolveWith(recover);
                } else {
                    result.fail(resolved.getFailure());
                }
            } catch (Throwable t) {
                result.fail(t);
            }
        }
    });
    return result;
}

Example 8 with Promise

use of org.osgi.util.promise.Promise in project aries by apache.

the class PromiseImpl method fallbackTo.

@Override
public Promise<T> fallbackTo(final Promise<? extends T> fallback) {
    if (fallback == null)
        throw new NullPointerException();
    final PromiseImpl<T> result = new PromiseImpl<T>(exec, ses);
    then(new Success<T, T>() {

        @Override
        public Promise<T> call(Promise<T> resolved) throws Exception {
            result.resolve(resolved.getValue());
            return null;
        }
    }, new Failure() {

        @Override
        public void fail(Promise<?> resolved) throws Exception {
            @SuppressWarnings({ "not thrown", "all" }) Throwable fail = fallback.getFailure();
            if (fail != null) {
                result.fail(resolved.getFailure());
            } else {
                result.resolve(fallback.getValue());
            }
        }
    });
    return result;
}

Example 9 with Promise

use of org.osgi.util.promise.Promise in project aries by apache.

the class PromiseImpl method filter.

@Override
public Promise<T> filter(final Predicate<? super T> predicate) {
    if (predicate == null)
        throw new NullPointerException();
    final PromiseImpl<T> result = new PromiseImpl<T>(exec, ses);
    then(new Success<T, T>() {

        @Override
        public Promise<T> call(Promise<T> resolved) throws Exception {
            try {
                if (predicate.test(resolved.getValue())) {
                    result.resolve(resolved.getValue());
                } else {
                    result.fail(new NoSuchElementException("predicate does not accept value"));
                }
            } catch (Throwable t) {
                result.fail(t);
            }
            return null;
        }
    }, new Failure() {

        @Override
        public void fail(Promise<?> resolved) throws Exception {
            result.fail(resolved.getFailure());
        }
    });
    return result;
}

Example 10 with Promise

use of org.osgi.util.promise.Promise in project aries by apache.

the class PromiseImpl method flatMap.

@Override
public <R> Promise<R> flatMap(final Function<? super T, Promise<? extends R>> mapper) {
    if (mapper == null)
        throw new NullPointerException();
    final PromiseImpl<R> result = new PromiseImpl<R>(exec, ses);
    then(new Success<T, T>() {

        @Override
        public Promise<T> call(Promise<T> resolved) throws Exception {
            try {
                Promise<? extends R> p = mapper.apply(resolved.getValue());
                result.resolveWith(p);
            } catch (Throwable t) {
                result.fail(t);
            }
            return null;
        }
    }, new Failure() {

        @Override
        public void fail(Promise<?> resolved) throws Exception {
            result.fail(resolved.getFailure());
        }
    });
    return result;
}