Package com.google.common.util.concurrent

Class ImmediateFuture<V>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private static java.util.logging.Logger log  
      (package private) static ListenableFuture<?> NULL  
      private V value  

    • Constructor Summary

      Constructors 
      Constructor Description
      ImmediateFuture​(V value)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void addListener​(java.lang.Runnable listener, java.util.concurrent.Executor executor)
      Registers a listener to be run on the given executor.
      boolean cancel​(boolean mayInterruptIfRunning)  
      V get()  
      V get​(long timeout, java.util.concurrent.TimeUnit unit)  
      boolean isCancelled()  
      boolean isDone()  
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

    • Field Detail

      • log

        private static final java.util.logging.Logger log

      • value

        private final V value

    • Constructor Detail

      • ImmediateFuture

        ImmediateFuture​(V value)

    • Method Detail

      • addListener

        public void addListener​(java.lang.Runnable listener,
                        java.util.concurrent.Executor executor)
        Description copied from interface: ListenableFuture
        Registers a listener to be run on the given executor. The listener will run when the Future's computation is complete or, if the computation is already complete, immediately.

        There is no guaranteed ordering of execution of listeners, but any listener added through this method is guaranteed to be called once the computation is complete.

        Exceptions thrown by a listener will be propagated up to the executor. Any exception thrown during Executor.execute (e.g., a RejectedExecutionException or an exception thrown by direct execution) will be caught and logged.

        Note: If your listener is lightweight -- and will not cause stack overflow by completing more futures or adding more directExecutor() listeners inline -- consider MoreExecutors.directExecutor(). Otherwise, avoid it: See the warnings on the docs for directExecutor.

        This is the most general listener interface. For common operations performed using listeners, see Futures. For a simplified but general listener interface, see addCallback().

        Memory consistency effects: Actions in a thread prior to adding a listener happen-before its execution begins, perhaps in another thread.

        Guava implementations of ListenableFuture promptly release references to listeners after executing them.

        Specified by:
        addListener in interface ListenableFuture<V>
        Parameters:
        listener - the listener to run when the computation is complete
        executor - the executor to run the listener in

      • cancel

        public boolean cancel​(boolean mayInterruptIfRunning)
        Specified by:
        cancel in interface java.util.concurrent.Future<V>

      • get

        public V get()
        Specified by:
        get in interface java.util.concurrent.Future<V>

      • get

        public V get​(long timeout,
             java.util.concurrent.TimeUnit unit)
      throws java.util.concurrent.ExecutionException
        Specified by:
        get in interface java.util.concurrent.Future<V>
        Throws:
        java.util.concurrent.ExecutionException

      • isCancelled

        public boolean isCancelled()
        Specified by:
        isCancelled in interface java.util.concurrent.Future<V>

      • isDone

        public boolean isDone()
        Specified by:
        isDone in interface java.util.concurrent.Future<V>

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object