Example usage for java.util.concurrent Callable Callable

List of usage examples for java.util.concurrent Callable Callable

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Introduction

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

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Callable

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Usage

From source file:de.cuseb.bilderbuch.images.ImageSearchService.java

public ImageResponse searchImages(final String query) {

    final ImageResponse response = new ImageResponse();
    final ListeningExecutorService executor = MoreExecutors
            .listeningDecorator(Executors.newFixedThreadPool(searches.size()));

    for (final ImageSearch search : searches.values()) {

        if (!search.isEnabled()) {
            continue;
        }//from w w w .j a v  a 2  s . c  o m

        ListenableFuture<List<Image>> searchResult = executor.submit(new Callable<List<Image>>() {
            @Override
            public List<Image> call() throws Exception {
                log.debug("starting enabled search " + search.getClass().getSimpleName());
                return search.searchImages(query);
            }
        });

        Futures.addCallback(searchResult, new FutureCallback<List<Image>>() {
            @Override
            public void onSuccess(List<Image> result) {
                log.debug(search.getClass().getSimpleName() + " result size: " + result.size());
                response.addImages(result);
            }

            @Override
            public void onFailure(Throwable t) {
                log.error(search.getClass().getSimpleName(), t);
            }
        });
    }

    try {
        executor.shutdown();
        executor.awaitTermination(timeout, TimeUnit.SECONDS);
    } catch (InterruptedException e) {
        log.error("awaitTermination interrupted", e);
    }

    if (shuffle) {
        log.debug("shuffling result");
        response.shuffle();
    }

    return response;
}

From source file:at.beris.virtualfile.client.ftp.FtpClient.java

@Override
public void deleteFile(final String path) throws IOException {
    LOGGER.debug("deleteFile (path : {})", path);
    executionHandler(new Callable<Void>() {
        @Override/*  w  w  w . j  a  v  a  2 s  .  c  o  m*/
        public Void call() throws Exception {
            int replyCode = ftpClient.dele(path);
            String replyText = ftpClient.getReplyString();
            if (!FTPReply.isPositiveCompletion(replyCode))
                LOGGER.warn("Unexpected Reply (Code: {}, Text: '{}'", replyCode, replyText);
            return null;
        }
    });
}

From source file:com.glaf.core.cache.CacheFactory.java

public static String getString(final String key) {
    boolean waitFor = true;
    Callable<String> task = new Callable<String>() {
        @Override//from   w  w  w .  jav  a  2 s.  c  om
        public String call() throws Exception {
            try {
                Cache cache = getCache();
                if (cache != null) {
                    String cacheKey = Environment.getCurrentSystemName() + "_" + CACHE_PREFIX + key;
                    if (SystemProperties.getDeploymentSystemName() != null) {
                        cacheKey = SystemProperties.getDeploymentSystemName() + "_"
                                + Environment.getCurrentSystemName() + "_" + CACHE_PREFIX + key;
                    }
                    cacheKey = DigestUtils.md5Hex(cacheKey.getBytes());
                    Object value = cache.get(cacheKey);
                    if (value != null) {
                        logger.debug("get object'" + key + "' from cache.");
                        return value.toString();
                    }
                }
            } catch (Exception ex) {
                if (logger.isDebugEnabled()) {
                    ex.printStackTrace();
                    logger.debug(ex);
                }
            }
            return null;
        }
    };

    try {
        Future<String> result = pool.submit(task);
        long start = System.currentTimeMillis();
        // ?
        if (waitFor) {
            while (true) {
                if (System.currentTimeMillis() - start > 2000) {
                    break;
                }
                if (result.isDone()) {
                    return result.get();
                }
            }
        }
    } catch (Exception e) {
        logger.error(e);
    }

    return null;
}

From source file:net.eusashead.hateoas.conditional.interceptor.AsyncTestController.java

@RequestMapping(method = RequestMethod.POST)
public Callable<ResponseEntity<Void>> post() {
    return new Callable<ResponseEntity<Void>>() {

        @Override/*from  w  w  w .  j  a va  2s .c  o  m*/
        public ResponseEntity<Void> call() throws Exception {
            return new ResponseEntity<Void>(HttpStatus.CREATED);
        }
    };
}

From source file:com.parse.CacheQueryController.java

/**
 * Retrieves the results of the last time {@link ParseQuery#find()} was called on a query
 * identical to this one./*from ww w  . j ava2 s  .co m*/
 *
 * @param sessionToken The user requesting access.
 * @return A list of {@link ParseObject}s corresponding to this query. Returns null if there is no
 *          cache for this query.
 */
private <T extends ParseObject> Task<List<T>> findFromCacheAsync(final ParseQuery.State<T> state,
        String sessionToken) {
    final String cacheKey = ParseRESTQueryCommand.findCommand(state, sessionToken).getCacheKey();
    return Task.call(new Callable<List<T>>() {
        @Override
        public List<T> call() throws Exception {
            JSONObject cached = ParseKeyValueCache.jsonFromKeyValueCache(cacheKey, state.maxCacheAge());
            if (cached == null) {
                throw new ParseException(ParseException.CACHE_MISS, "results not cached");
            }
            try {
                return networkController.convertFindResponse(state, cached);
            } catch (JSONException e) {
                throw new ParseException(ParseException.CACHE_MISS, "the cache contains corrupted json");
            }
        }
    }, Task.BACKGROUND_EXECUTOR);
}

From source file:SingleThreadRequestExecutor.java

@Override
public <T> Future<T> submit(final Callable<T> task) {
    return executor.submit(new Callable<T>() {
        @Override//from   ww w . ja va2 s  .c o m
        public T call() throws Exception {
            try {
                return task.call();
            } catch (Throwable e) {
                // This normally bad code of catch on Exception is here for a *reason*.
                // Future *eats* all exceptions *silently*. This clause at least allows
                // the exception to emit noise for debugging. This is particularly pernicious
                // if you have something like a NullPointerException

                e.printStackTrace();
                throw new RuntimeException(e);
            }

        }
    });
}

From source file:com.mrfeinberg.translation.AbstractTranslationService.java

public Runnable translate(final String phrase, final LanguagePair lp, final TranslationListener listener) {
    final Language b = lp.b();

    final HttpClient httpClient = new HttpClient();
    if (proxyPrefs.getUseProxy()) {
        httpClient.getHostConfiguration().setProxy(proxyPrefs.getProxyHost(), proxyPrefs.getProxyPort());
    }/*from  ww w  .  j av a  2  s . c o m*/

    final HttpMethod httpMethod = getHttpMethod(phrase, lp);
    final Callable<String> callable = new Callable<String>() {
        public String call() throws Exception {
            int result = httpClient.executeMethod(httpMethod);
            if (result != 200) {
                throw new Exception("Got " + result + " status for " + httpMethod.getURI());
            }
            final BufferedReader in = new BufferedReader(
                    new InputStreamReader(httpMethod.getResponseBodyAsStream(), "utf8"));
            try {
                final StringBuilder sb = new StringBuilder();
                String line;
                while ((line = in.readLine()) != null)
                    sb.append(line);
                return sb.toString();
            } finally {
                in.close();
                httpMethod.releaseConnection();
            }
        }
    };
    final FutureTask<String> tc = new FutureTask<String>(callable);
    return new Runnable() {
        public void run() {
            try {
                executor.execute(tc);
                final String result = tc.get(timeout, TimeUnit.MILLISECONDS);
                String found = findTranslatedText(result);
                if (found == null) {
                    listener.error("Cannot find translated text in result.");
                } else {
                    found = found.replaceAll("\\s+", " ");
                    listener.result(found, b);
                }
            } catch (final TimeoutException e) {
                listener.timedOut();
            } catch (final InterruptedException e) {
                listener.cancelled();
            } catch (final Exception e) {
                e.printStackTrace();
                listener.error(e.toString());
            }
        }
    };
}

From source file:com.microsoft.windowsazure.management.RoleSizeOperationsImpl.java

/**
* The List Role Sizes operation lists all of the role sizes that are valid
* for your subscription./*from   www.  j  av  a 2  s  .  c  o  m*/
*
* @return The List Role Sizes operation response.
*/
@Override
public Future<RoleSizeListResponse> listAsync() {
    return this.getClient().getExecutorService().submit(new Callable<RoleSizeListResponse>() {
        @Override
        public RoleSizeListResponse call() throws Exception {
            return list();
        }
    });
}

From source file:apiserver.services.images.controllers.MetadataController.java

/**
 * get embedded metadata/*ww w .j  ava 2s. c o m*/
 * @param documentId
 * @return   height,width
 */
@ApiOperation(value = "Get the embedded metadata", responseClass = "java.util.Map")
@RequestMapping(value = "/info/{documentId}/metadata", method = { RequestMethod.GET })
public WebAsyncTask<Map> imageMetadataByImage(
        @ApiParam(name = "documentId", required = true, defaultValue = "8D981024-A297-4169-8603-E503CC38EEDA") @PathVariable(value = "documentId") String documentId) {
    final String _documentId = documentId;

    Callable<Map> callable = new Callable<Map>() {
        @Override
        public Map call() throws Exception {
            FileMetadataJob args = new FileMetadataJob();
            args.setDocumentId(_documentId);

            Future<Map> imageFuture = imageMetadataGateway.getMetadata(args);
            FileMetadataJob payload = (FileMetadataJob) imageFuture.get(defaultTimeout, TimeUnit.MILLISECONDS);

            return payload.getMetadata();
        }
    };

    return new WebAsyncTask<Map>(defaultTimeout, callable);
}

From source file:org.apache.camel.component.http4.HttpConcurrentTest.java

private void doSendMessages(int files, int poolSize) throws Exception {
    ExecutorService executor = Executors.newFixedThreadPool(poolSize);
    // we access the responses Map below only inside the main thread,
    // so no need for a thread-safe Map implementation
    Map<Integer, Future<String>> responses = new HashMap<Integer, Future<String>>();
    for (int i = 0; i < files; i++) {
        final int index = i;
        Future<String> out = executor.submit(new Callable<String>() {
            public String call() throws Exception {
                return template.requestBody("http4://" + getHostName() + ":" + getPort(), null, String.class);
            }//from  w  ww.ja v  a  2s.  c o m
        });
        responses.put(index, out);
    }

    assertEquals(files, responses.size());

    // get all responses
    Set<String> unique = new HashSet<String>();
    for (Future<String> future : responses.values()) {
        unique.add(future.get());
    }

    // should be 'files' unique responses
    assertEquals("Should be " + files + " unique responses", files, unique.size());
    executor.shutdownNow();
}