Class Promises


  • public class Promises
    extends java.lang.Object
    Static helper methods for Promises.
    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static <T,​S extends T>
      Promise<java.util.List<T>>
      all​(java.util.Collection<Promise<S>> promises)
      Create a new Promise that is a latch on the resolution of the specified Promises.
      static <T> Promise<java.util.List<T>> all​(Promise<? extends T>... promises)
      Create a new Promise that is a latch on the resolution of the specified Promises.
      static <T> Promise<T> failed​(java.lang.Throwable failure)
      Create a new Promise that has been resolved with the specified failure.
      static <T> Promise<T> resolved​(T value)
      Create a new Promise that has been resolved with the specified value.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Method Detail

      • resolved

        public static <T> Promise<T> resolved​(T value)
        Create a new Promise that has been resolved with the specified value.
        Type Parameters:
        T - The value type associated with the returned Promise.
        Parameters:
        value - The value of the resolved Promise.
        Returns:
        A new Promise that has been resolved with the specified value.
      • failed

        public static <T> Promise<T> failed​(java.lang.Throwable failure)
        Create a new Promise that has been resolved with the specified failure.
        Type Parameters:
        T - The value type associated with the returned Promise.
        Parameters:
        failure - The failure of the resolved Promise. Must not be null.
        Returns:
        A new Promise that has been resolved with the specified failure.
      • all

        public static <T,​S extends T> Promise<java.util.List<T>> all​(java.util.Collection<Promise<S>> promises)
        Create a new Promise that is a latch on the resolution of the specified Promises.

        The new Promise acts as a gate and must be resolved after all of the specified Promises are resolved.

        Type Parameters:
        T - The value type of the List value associated with the returned Promise.
        S - A subtype of the value type of the List value associated with the returned Promise.
        Parameters:
        promises - The Promises which must be resolved before the returned Promise must be resolved. Must not be null and all of the elements in the collection must not be null.
        Returns:
        A Promise that is resolved only when all the specified Promises are resolved. The returned Promise must be successfully resolved with a List of the values in the order of the specified Promises if all the specified Promises are successfully resolved. The List in the returned Promise is the property of the caller and is modifiable. The returned Promise must be resolved with a failure of FailedPromisesException if any of the specified Promises are resolved with a failure. The failure FailedPromisesException must contain all of the specified Promises which resolved with a failure.
      • all

        public static <T> Promise<java.util.List<T>> all​(Promise<? extends T>... promises)
        Create a new Promise that is a latch on the resolution of the specified Promises.

        The new Promise acts as a gate and must be resolved after all of the specified Promises are resolved.

        Type Parameters:
        T - The value type associated with the specified Promises.
        Parameters:
        promises - The Promises which must be resolved before the returned Promise must be resolved. Must not be null and all of the arguments must not be null.
        Returns:
        A Promise that is resolved only when all the specified Promises are resolved. The returned Promise must be successfully resolved with a List of the values in the order of the specified Promises if all the specified Promises are successfully resolved. The List in the returned Promise is the property of the caller and is modifiable. The returned Promise must be resolved with a failure of FailedPromisesException if any of the specified Promises are resolved with a failure. The failure FailedPromisesException must contain all of the specified Promises which resolved with a failure.