Class AbstractCheckedFuture<V,​X extends java.lang.Exception>

    • Constructor Detail

      • AbstractCheckedFuture

        protected AbstractCheckedFuture​(ListenableFuture<V> delegate)
        Constructs an AbstractCheckedFuture that wraps a delegate.
    • Method Detail

      • mapException

        protected abstract X mapException​(java.lang.Exception e)
        Translates from an InterruptedException, CancellationException or ExecutionException thrown by get to an exception of type X to be thrown by checkedGet. Subclasses must implement this method.

        If e is an InterruptedException, the calling checkedGet method has already restored the interrupt after catching the exception. If an implementation of mapException(Exception) wishes to swallow the interrupt, it can do so by calling Thread.interrupted().

        Subclasses may choose to throw, rather than return, a subclass of RuntimeException to allow creating a CheckedFuture that throws both checked and unchecked exceptions.

      • checkedGet

        public V checkedGet()
                     throws X extends java.lang.Exception
        Exception checking version of Future.get() that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions.

        This implementation calls ForwardingFuture.get() and maps that method's standard exceptions to instances of type X using mapException(java.lang.Exception).

        In addition, if get throws an InterruptedException, this implementation will set the current thread's interrupt status before calling mapException.

        Specified by:
        checkedGet in interface CheckedFuture<V,​X extends java.lang.Exception>
        Returns:
        the result of executing the future.
        Throws:
        X - if ForwardingFuture.get() throws an InterruptedException, CancellationException, or ExecutionException
        X extends java.lang.Exception
      • checkedGet

        public V checkedGet​(long timeout,
                            java.util.concurrent.TimeUnit unit)
                     throws java.util.concurrent.TimeoutException,
                            X extends java.lang.Exception
        Exception checking version of Future.get(long, TimeUnit) that will translate InterruptedException, CancellationException and ExecutionException into application-specific exceptions. On timeout this method throws a normal TimeoutException.

        This implementation calls ForwardingFuture.get(long, TimeUnit) and maps that method's standard exceptions (excluding TimeoutException, which is propagated) to instances of type X using mapException(java.lang.Exception).

        In addition, if get throws an InterruptedException, this implementation will set the current thread's interrupt status before calling mapException.

        Specified by:
        checkedGet in interface CheckedFuture<V,​X extends java.lang.Exception>
        Returns:
        the result of executing the future.
        Throws:
        X - if ForwardingFuture.get() throws an InterruptedException, CancellationException, or ExecutionException
        java.util.concurrent.TimeoutException - if retrieving the result timed out.
        X extends java.lang.Exception