Example usage for io.vertx.core CompositeFuture cause

Introduction

In this page you can find the example usage for io.vertx.core CompositeFuture cause.

Prototype

Throwable cause(int index);

Source Link

Document

Returns a cause of a wrapped future

Usage

From source file:io.engagingspaces.vertx.dataloader.DataLoader.java

License:Open Source License

/**
 * Dispatches the queued load requests to the batch execution function and returns a composite future of the result.
 * <p>/*from   w w w . j a  v a2  s .  c  o  m*/
 * If batching is disabled, or there are no queued requests, then a succeeded composite future is returned.
 *
 * @return the composite future of the queued load requests
 */
public CompositeFuture dispatch() {
    if (!loaderOptions.batchingEnabled() || loaderQueue.size() == 0) {
        return CompositeFuture.join(Collections.emptyList());
    }
    CompositeFuture batch = batchLoadFunction.load(loaderQueue.keySet());
    dispatchedQueues.put(batch, new LinkedHashMap<>(loaderQueue));
    batch.setHandler(rh -> {
        AtomicInteger index = new AtomicInteger(0);
        dispatchedQueues.get(batch).forEach((key, future) -> {
            if (batch.succeeded(index.get())) {
                future.complete(batch.resultAt(index.get()));
            } else {
                future.fail(batch.cause(index.get()));
            }
            index.incrementAndGet();
        });
        dispatchedQueues.remove(batch);
    });
    loaderQueue.clear();
    return batch;
}

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