Examples of java.util.concurrent.Callable

java.util.concurrent.Callable
Emulation of Callable. @author Charles Fry

            Future<ReferenceValue<V>> f = this.cache.get(refKey);
            V value = dereferenceValue(f);
            if (value != null) {
              return value;
            } else {
                Callable<ReferenceValue<V>> call = new Callable() {
                    public ReferenceValue<V> call() throws Exception {
                        V created = create((K) key);
                        if (created != null) {
                            return valueFactory.createValue(queue, created);
                        } else {

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        }
    }
    
    public V put(K key, final V value) {
        ReferenceKey refKey = this.keyFactory.createKey(this.queue, key);
        Callable<ReferenceValue<V>> call = new Callable() {
            public ReferenceValue<V> call() throws Exception {
                return valueFactory.createValue(queue, value);
            }
        };
        FutureTask<ReferenceValue<V>> task = new FutureTask<ReferenceValue<V>>(call);

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     * The bit flag associated with this column family is set in the
     * header and this is used to decide if the log file can be deleted.
    */
    void onMemtableFlush(final String tableName, final String cf, final CommitLog.CommitLogContext cLogCtx) throws IOException
    {
        Callable task = new Callable()
        {
            public Object call() throws IOException
            {
                Table table = Table.open(tableName);
                int id = table.getColumnFamilyId(cf);

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    }


    void flushAES() throws Exception
    {
        final ThreadPoolExecutor stage = StageManager.getStage(Stage.ANTI_ENTROPY);
        final Callable noop = new Callable<Object>()
        {
            public Boolean call()
            {
                return true;
            }

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    // helper method to apply migration on the migration stage. typical migration failures will throw an 
    // InvalidRequestException. atypical failures will throw a RuntimeException.
    private static void applyMigrationOnStage(final Migration m)
    {
        Future f = StageManager.getStage(Stage.MIGRATION).submit(new Callable()
        {
            public Object call() throws Exception
            {
                m.apply();
                m.announce();

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     * The bit flag associated with this column family is set in the
     * header and this is used to decide if the log file can be deleted.
    */
    public void discardCompletedSegments(final Integer cfId, final CommitLogSegment.CommitLogContext context) throws IOException
    {
        Callable task = new Callable()
        {
            public Object call() throws IOException
            {
                discardCompletedSegmentsInternal(context, cfId);
                return null;

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    // helper method to apply migration on the migration stage. typical migration failures will throw an 
    // InvalidRequestException. atypical failures will throw a RuntimeException.
    private static void applyMigrationOnStage(final Migration m)
    {
        Future f = StageManager.getStage(Stage.MIGRATION).submit(new Callable()
        {
            public Object call() throws Exception
            {
                m.apply();
                m.announce();

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    HashMap<byte[], Future> writeFutureResult = new HashMap<byte[], Future>();
    NamingThreadFactory f  = new NamingThreadFactory(
            "SplitWriter-%1$d", Executors.defaultThreadFactory());
    ThreadPoolExecutor threadPool = (ThreadPoolExecutor)Executors.newFixedThreadPool(logWriterThreads, f);
    for (final byte[] region : splitLogsMap.keySet()) {
      Callable splitter = createNewSplitter(rootDir, logWriters, splitLogsMap, region, fs, conf);
      writeFutureResult.put(region, threadPool.submit(splitter));
    }


    threadPool.shutdown();
    // Wait for all threads to terminate

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    }


    void flushAES() throws Exception
    {
        final ThreadPoolExecutor stage = StageManager.getStage(Stage.ANTI_ENTROPY);
        final Callable noop = new Callable<Object>()
        {
            public Boolean call()
            {
                return true;
            }

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    *
    * @return new instance of Callable<?> whose call() method either throws an exception or returns null if the task was
    *         successfull.
    */
   protected Callable<?> createPushStateTask() {
      return new Callable() {
         public Object call() throws Exception {
            final boolean debugEnabled = log.isDebugEnabled();


            if (debugEnabled) log.debug("start pushing in-memory state to cache cacheLoader");
            pushState(cache);

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