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

  • All Implemented Interfaces:
    CheckedFuture<V,​X>, ListenableFuture<V>, java.util.concurrent.Future<V>

    @Beta
    @Deprecated
    @GwtIncompatible
    public abstract class AbstractCheckedFuture<V,​X extends java.lang.Exception>
    extends ForwardingListenableFuture.SimpleForwardingListenableFuture<V>
    implements CheckedFuture<V,​X>
    Deprecated.
    CheckedFuture cannot properly support the chained operations that are the primary goal of ListenableFuture. CheckedFuture also encourages users to rethrow exceptions from one thread in another thread, producing misleading stack traces. Additionally, it has a surprising policy about which exceptions to map and which to leave untouched. Guava users who want a CheckedFuture can fork the classes for their own use, possibly specializing them to the particular exception type they use. We recommend that most people use ListenableFuture and perform any exception wrapping themselves. This class is scheduled for removal from Guava in February 2018.
    A delegating wrapper around a ListenableFuture that adds support for the checkedGet() and checkedGet(long, TimeUnit) methods.
    Since:
    1.0
    Author:
    Sven Mawson
    • Method Detail

      • mapException

        protected abstract X mapException​(java.lang.Exception e)
        Deprecated.
        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
        Deprecated.
        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
        Deprecated.
        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