opendaylight/md-sal/sal-common-util/src/main/java/org/opendaylight/controller/sal/common/util/Futures.java

   1 package org.opendaylight.controller.sal.common.util;
   2
   3 import java.util.concurrent.ExecutionException;
   4 import java.util.concurrent.Future;
   5 import java.util.concurrent.TimeUnit;
   6 import java.util.concurrent.TimeoutException;
   7
   8 public class Futures {
   9
  10     private Futures() {
  11     }
  12
  13     public static <T> Future<T> immediateFuture(T result) {
  14         return new ImmediateFuture<T>(result);
  15     }
  16
  17     private static class ImmediateFuture<T> implements Future<T> {
  18
  19         private final T result;
  20
  21         public ImmediateFuture(T result) {
  22             this.result = result;
  23         }
  24
  25         @Override
  26         public boolean cancel(boolean mayInterruptIfRunning) {
  27             return false;
  28         }
  29
  30         @Override
  31         public boolean isCancelled() {
  32             return false;
  33         }
  34
  35         @Override
  36         public boolean isDone() {
  37             return true;
  38         }
  39
  40         @Override
  41         public T get() throws InterruptedException, ExecutionException {
  42             return result;
  43         }
  44
  45         @Override
  46         public T get(long timeout, TimeUnit unit) throws InterruptedException,
  47                 ExecutionException, TimeoutException {
  48             return result;
  49         }
  50
  51     }
  52 }