Examples of java.util.concurrent.Future

java.util.concurrent.Future
ther things while searching try { displayText(future.get()); // use future } catch (ExecutionException ex) { cleanup(); return; } } }} The {@link FutureTask} class is an implementation of {@code Future} thatimplements {@code Runnable}, and so may be executed by an {@code Executor}. For example, the above construction with {@code submit} could be replaced by:
```
  {@code FutureTask future =}new FutureTask(new Callable()  public String call() { return searcher.search(target); }}); executor.execute(future);}
```
Memory consistency effects: Actions taken by the asynchronous computation happen-before actions following the corresponding {@code Future.get()} in another thread. @see FutureTask @see Executor @since 1.5 @author Doug Lea @param < V> The result type returned by this Future's {@code get} method

        }


        public void run() {
            boolean execute=true;
            synchronized(tasks) {
                Future future=tasks.get(token);
                if(future != null) {
                    future.cancel(false);
                    execute=true;
                }
                else {
                    execute=false;
                }

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   @Override
   public NotifyingFuture<Boolean> removeWithVersionAsync(final K key, final long version) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<Boolean> result = new NotifyingFutureImpl<Boolean>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            boolean removed = removeWithVersion(key, version);
            result.notifyFutureCompletion();
            return removed;

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   @Override
   public NotifyingFuture<Boolean> replaceWithVersionAsync(final K key, final V newValue, final long version, final int lifespanSeconds, final int maxIdleSeconds) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<Boolean> result = new NotifyingFutureImpl<Boolean>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            boolean removed = replaceWithVersion(key, newValue, version, lifespanSeconds, maxIdleSeconds);
            result.notifyFutureCompletion();
            return removed;

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   @Override
   public NotifyingFuture<Void> putAllAsync(final Map<? extends K, ? extends V> data, final long lifespan, final TimeUnit lifespanUnit, final long maxIdle, final TimeUnit maxIdleUnit) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<Void> result = new NotifyingFutureImpl<Void>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            putAll(data, lifespan, lifespanUnit, maxIdle, maxIdleUnit);
            result.notifyFutureCompletion();
            return null;

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   @Override
   public NotifyingFuture<V> putAsync(final K key, final V value, final long lifespan, final TimeUnit lifespanUnit, final long maxIdle, final TimeUnit maxIdleUnit) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<V> result = new NotifyingFutureImpl<V>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            V prevValue = put(key, value, lifespan, lifespanUnit, maxIdle, maxIdleUnit);
            result.notifyFutureCompletion();
            return prevValue;

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   @Override
   public NotifyingFuture<Void> clearAsync() {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<Void> result = new NotifyingFutureImpl<Void>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            clear();
            result.notifyFutureCompletion();
            return null;

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   @Override
   public NotifyingFuture<V> putIfAbsentAsync(final K key,final V value,final long lifespan,final TimeUnit lifespanUnit,final long maxIdle,final TimeUnit maxIdleUnit) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<V> result = new NotifyingFutureImpl<V>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            V prevValue = putIfAbsent(key, value, lifespan, lifespanUnit, maxIdle, maxIdleUnit);
            result.notifyFutureCompletion();
            return prevValue;

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   @Override
   public NotifyingFuture<V> removeAsync(final Object key) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<V> result = new NotifyingFutureImpl<V>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            V toReturn = remove(key);
            result.notifyFutureCompletion();
            return toReturn;

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   @Override
   public NotifyingFuture<V> replaceAsync(final K key,final V value,final long lifespan,final TimeUnit lifespanUnit,final long maxIdle,final TimeUnit maxIdleUnit) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<V> result = new NotifyingFutureImpl<V>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            V v = replace(key, value, lifespan, lifespanUnit, maxIdle, maxIdleUnit);
            result.notifyFutureCompletion();
            return v;

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   @Override
   public NotifyingFuture<V> getAsync(final K key) {
      assertRemoteCacheManagerIsStarted();
      final NotifyingFutureImpl<V> result = new NotifyingFutureImpl<V>();
      Future future = executorService.submit(new Callable() {
         @Override
         public Object call() throws Exception {
            V toReturn = get(key);
            result.notifyFutureCompletion();
            return toReturn;

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