Examples of com.google_voltpatches.common.util.concurrent.ListenableFuture | massapi.com

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Package com.google_voltpatches.common.util.concurrent

Examples of com.google_voltpatches.common.util.concurrent.ListenableFuture

com.google_voltpatches.common.util.concurrent.ListenableFuture
google.com/p/guava-libraries/wiki/ListenableFutureExplained"> {@code ListenableFuture}.
Purpose

Most commonly, {@code ListenableFuture} is used as an input to anotherderived {@code Future}, as in {@link Futures#allAsList(Iterable) Futures.allAsList}. Many such methods are impossible to implement efficiently without listener support.
It is possible to call {@link #addListener addListener} directly, but thisis uncommon because the {@code Runnable} interface does not provide directaccess to the {@code Future} result. (Users who want such access may prefer{@link Futures#addCallback Futures.addCallback}.) Still, direct {@code addListener} calls are occasionally useful:
```
   {@code final String name = ...; inFlight.add(name); ListenableFuture future = service.query(name);}future.addListener(new Runnable()  public void run() { processedCount.incrementAndGet(); inFlight.remove(name); lastProcessed.set(name); logger.info("Done with {0}", name); } }, executor);}
```
How to get an instance

Developers are encouraged to return {@code ListenableFuture} from theirmethods so that users can take advantages of the utilities built atop the class. The way that they will create {@code ListenableFuture} instancesdepends on how they currently create {@code Future} instances:
- If they are returned from an {@code ExecutorService}, convert that service to a {@link ListeningExecutorService}, usually by calling {@link MoreExecutors#listeningDecorator(ExecutorService) MoreExecutors.listeningDecorator}. (Custom executors may find it more convenient to use {@link ListenableFutureTask} directly.)
- If they are manually filled in by a call to {@link FutureTask#set} or asimilar method, create a {@link SettableFuture} instead. (Users with morecomplex needs may prefer {@link AbstractFuture}.)
Occasionally, an API will return a plain {@code Future} and it will beimpossible to change the return type. For this case, we provide a more expensive workaround in {@code JdkFutureAdapters}. However, when possible, it is more efficient and reliable to create a {@code ListenableFuture} directly. @author Sven Mawson @author Nishant Thakkar @since 1.0

    @SuppressWarnings("rawtypes")
    public Pair<ListenableFuture, Boolean> streamMore(SystemProcedureExecutionContext context,
                                                      List<DBBPool.BBContainer> outputBuffers,
                                                      int[] rowCountAccumulator)
    {
        ListenableFuture writeFuture = null;


        prepareBuffers(outputBuffers);


        Pair<Long, int[]> serializeResult = context.tableStreamSerializeMore(m_tableId, m_type, outputBuffers);
        if (serializeResult.getFirst() == SERIALIZATION_ERROR) {

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            // Stream more and add a listener to handle any failures
            Pair<ListenableFuture, Boolean> streamResult =
                    m_streamers.get(tableId).streamMore(context, outputBuffers, null);
            if (streamResult.getFirst() != null) {
                final ListenableFuture writeFutures = streamResult.getFirst();
                writeFutures.addListener(new Runnable() {
                    @Override
                    public void run()
                    {
                        try {
                            writeFutures.get();
                        } catch (Throwable t) {
                            if (m_lastSnapshotSucceded) {
                                if (t instanceof StreamSnapshotTimeoutException ||
                                        t.getCause() instanceof StreamSnapshotTimeoutException) {
                                    //This error is already logged by the watchdog when it generates the exception

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Related Classes of com.google_voltpatches.common.util.concurrent.ListenableFuture

org.voltdb.SnapshotSiteProcessor

org.voltdb.TableStreamer

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