Example usage for java.util.concurrent CompletableFuture supplyAsync

Introduction

In this page you can find the example usage for java.util.concurrent CompletableFuture supplyAsync.

Prototype

public static <U> CompletableFuture<U> supplyAsync(Supplier<U> supplier, Executor executor) 

Source Link

Document

Returns a new CompletableFuture that is asynchronously completed by a task running in the given executor with the value obtained by calling the given Supplier.

Usage

From source file:async.nio2.Main.java

public static void main(String[] args) throws IOException, InterruptedException, ExecutionException {

    if (args.length == 3) {
        PORT = Integer.valueOf(args[0]);
        NO_CLIENTS = Integer.valueOf(args[1]);
        NO_SAMPLES = Integer.valueOf(args[2]);
    }// w w  w  .  j  ava  2s . com

    if (PORT < 0) {
        System.err.println("Error: port < 0");
        System.exit(1);
    }

    if (NO_CLIENTS < 1) {
        System.err.println("Error: #clients < 1");
        System.exit(1);
    }

    if (NO_SAMPLES < 1) {
        System.err.println("Error: #samples < 1");
        System.exit(1);
    }

    AsynchronousChannelGroup groupServer = AsynchronousChannelGroup
            .withThreadPool(Executors.newFixedThreadPool(1));
    AsynchronousChannelGroup groupClient = AsynchronousChannelGroup
            .withThreadPool(Executors.newFixedThreadPool(1));

    Server server = Server.newInstance(new InetSocketAddress("localhost", PORT), groupServer);
    InetSocketAddress localAddress = server.getLocalAddress();
    String hostname = localAddress.getHostName();
    int port = localAddress.getPort();

    ExecutorService es = Executors.newFixedThreadPool(2);

    System.out.printf("%03d clients on %s:%d, %03d runs each. All times in s.%n", NO_CLIENTS, hostname, port,
            NO_SAMPLES);
    range(0, NO_CLIENTS).unordered().parallel()
            .mapToObj(i -> CompletableFuture.supplyAsync(newClient(localAddress, groupClient), es).join())
            .map(array -> Arrays.stream(array).reduce(new DescriptiveStatistics(), Main::accumulate,
                    Main::combine))
            .map(Main::toEvaluationString).forEach(System.out::println);

    es.shutdown();
    es.awaitTermination(5, TimeUnit.SECONDS);

    groupClient.shutdown();
    groupClient.awaitTermination(5, TimeUnit.SECONDS);

    server.close();
    groupServer.shutdown();
    groupServer.awaitTermination(5, TimeUnit.SECONDS);
}

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From source file:com.nike.cerberus.endpoints.authentication.AuthenticateUser.java

@Override
public CompletableFuture<ResponseInfo<AuthResponse>> execute(final RequestInfo<Void> request,
        final Executor longRunningTaskExecutor, final ChannelHandlerContext ctx) {
    return CompletableFuture.supplyAsync(() -> {
        final UserCredentials credentials = extractCredentials(
                request.getHeaders().get(HttpHeaders.AUTHORIZATION));
        return ResponseInfo.newBuilder(authenticationService.authenticate(credentials)).build();
    }, longRunningTaskExecutor);//www . j a va2 s  .  co m
}

---

From source file:de.ks.file.FileStore.java

public CompletableFuture<FileReference> getReference(File file) {
    if (!file.exists()) {
        throw new IllegalArgumentException("File " + file + " does not exist");
    }/* ww  w .ja  v a 2 s  . c o m*/
    CompletableFuture<String> md5Sum = CompletableFuture.supplyAsync(() -> getMd5(file), executorService);

    return md5Sum.thenApply(md5 -> resolveReference(md5, file));
}

---

From source file:com.nike.cerberus.endpoints.admin.GetSDBMetaData.java

@SuppressWarnings("ConstantConditions") // it lies
@Override/*from w w w .  java2s  .  co m*/
public CompletableFuture<ResponseInfo<SDBMetaDataResult>> doExecute(final RequestInfo<Void> request,
        final Executor longRunningTaskExecutor, final ChannelHandlerContext ctx,
        final SecurityContext securityContext) {

    return CompletableFuture.supplyAsync(() -> ResponseInfo
            .newBuilder(metaDataService.getSDBMetaData(getLimit(request), getOffset(request))).build(),
            longRunningTaskExecutor);
}

---

From source file:com.redhat.coolstore.api_gateway.ApiGatewayController.java

/**
 * This /api REST endpoint uses Java 8 concurrency to call two backend services to construct the result
 *
 * @return the list//w  w w  .j  a va 2 s. c o m
 */
@CrossOrigin(maxAge = 3600)
@RequestMapping(method = RequestMethod.GET, value = "/products", produces = MediaType.APPLICATION_JSON_VALUE)
@ApiOperation("Get a list of products")
@ResponseBody
public List<Product> list() throws ExecutionException, InterruptedException {

    final CompletableFuture<List<Product>> productList = CompletableFuture
            .supplyAsync(() -> feignClientFactory.getPricingClient().getService().getProducts(), es);

    return productList.thenCompose((List<Product> products) -> {

        List<CompletableFuture<Product>> all = products.stream()
                .map(p -> productList.thenCombine(_getInventory(p.itemId), (pl, a) -> {
                    p.availability = a;
                    return p;
                })).collect(Collectors.toList());

        return CompletableFuture.allOf(all.toArray(new CompletableFuture[all.size()]))
                .thenApply(v -> all.stream().map(CompletableFuture::join).collect(Collectors.toList()));
    }).get();

}

---

From source file:edu.berkeley.ground.postgres.controllers.GraphController.java

public final CompletionStage<Result> getGraph(String sourceKey) {
    return CompletableFuture.supplyAsync(() -> {
        try {/*  w  w  w  .jav a  2 s.  com*/
            return this.cache.getOrElse("graphs",
                    () -> Json.toJson(this.postgresGraphDao.retrieveFromDatabase(sourceKey)),
                    Integer.parseInt(System.getProperty("ground.cache.expire.secs")));
        } catch (Exception e) {
            throw new CompletionException(e);
        }
    }, PostgresUtils.getDbSourceHttpContext(this.actorSystem)).thenApply(Results::ok)
            .exceptionally(e -> GroundUtils.handleException(e, request()));
}

---

From source file:edu.berkeley.ground.postgres.controllers.StructureController.java

public final CompletionStage<Result> getStructure(String sourceKey) {
    return CompletableFuture.supplyAsync(() -> {
        try {/*from ww w .j  av  a2s  . c o  m*/
            return this.cache.getOrElse("structures",
                    () -> Json.toJson(this.postgresStructureDao.retrieveFromDatabase(sourceKey)),
                    Integer.parseInt(System.getProperty("ground.cache.expire.secs")));
        } catch (Exception e) {
            throw new CompletionException(e);
        }
    }, PostgresUtils.getDbSourceHttpContext(this.actorSystem)).thenApply(Results::ok)
            .exceptionally(e -> GroundUtils.handleException(e, request()));
}

---

From source file:edu.berkeley.ground.postgres.controllers.GraphController.java

public final CompletionStage<Result> getGraphVersion(Long id) {
    return CompletableFuture.supplyAsync(() -> {
        try {/* w ww  .  j  a  v  a 2s. c  om*/
            return this.cache.getOrElse("graph_versions",
                    () -> Json.toJson(this.postgresGraphVersionDao.retrieveFromDatabase(id)),
                    Integer.parseInt(System.getProperty("ground.cache.expire.secs")));
        } catch (Exception e) {
            throw new CompletionException(e);
        }
    }, PostgresUtils.getDbSourceHttpContext(this.actorSystem)).thenApply(Results::ok)
            .exceptionally(e -> GroundUtils.handleException(e, request()));
}

---

From source file:edu.berkeley.ground.postgres.controllers.StructureController.java

public final CompletionStage<Result> getStructureVersion(Long id) {
    return CompletableFuture.supplyAsync(() -> {
        try {//w  w  w .j  a  v a 2s. c  om
            return this.cache.getOrElse("structure_versions",
                    () -> Json.toJson(this.postgresStructureVersionDao.retrieveFromDatabase(id)),
                    Integer.parseInt(System.getProperty("ground.cache.expire.secs")));
        } catch (Exception e) {
            throw new CompletionException(e);
        }
    }, PostgresUtils.getDbSourceHttpContext(this.actorSystem)).thenApply(Results::ok)
            .exceptionally(e -> GroundUtils.handleException(e, request()));
}

---

From source file:org.trustedanalytics.platformoperations.service.PlatformOperationsScheduler.java

private Runnable platformSummary() {
    return () -> {

        if (flag.compareAndSet(false, true)) {
            try {
                LOGGER.info("Trigger Platform Summary");

                final CompletableFuture<ComponentSummary> componentSummary = CompletableFuture
                        .supplyAsync(new ComponentDiscoverTask(nats), executor)
                        .thenApply(messages -> new ComponentMetricsTask("DEA", messages).get())
                        .thenApply(ComponentSummary::new);

                final CompletableFuture<ControllerSummary> controllerSummary = CompletableFuture
                        .supplyAsync(new ControllerMetricsTask(client), executor);

                CompletableFuture.allOf(componentSummary, controllerSummary).get(10, TimeUnit.MINUTES);

                repository.save(new PlatformSummary(componentSummary.get(1, TimeUnit.MINUTES),
                        controllerSummary.get(1, TimeUnit.MINUTES)));
            } catch (TimeoutException | ExecutionException | InterruptedException ex) {
                LOGGER.error("Exception during fetching metrics: {}" + ex);
            } finally {
                flag.set(false);/*from  w  w  w.  j  a va  2s . com*/
            }
        } else {
            LOGGER.info("Request skipped, task already submitted!");
        }
    };
}

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