Example usage for java.util Optional isPresent

Introduction

In this page you can find the example usage for java.util Optional isPresent.

Prototype

public boolean isPresent() 

Source Link

Document

If a value is present, returns true , otherwise false .

Usage

From source file:io.github.benas.randombeans.util.ReflectionUtils.java

@SuppressWarnings("unchecked")
public static <T> Randomizer<T> newInstance(final Class<T> type,
        final RandomizerArgument[] randomizerArguments) {
    try {/*from w w  w . ja v  a 2  s. co m*/
        if (notEmpty(randomizerArguments)) {
            Optional<Constructor<?>> matchingConstructor = asList(type.getConstructors()).stream()
                    .filter(constructor -> hasSameArgumentNumber(constructor, randomizerArguments)
                            && hasSameArgumentTypes(constructor, randomizerArguments))
                    .findFirst();
            if (matchingConstructor.isPresent()) {
                return (Randomizer<T>) matchingConstructor.get()
                        .newInstance(convertArguments(randomizerArguments));
            }
        }
        return (Randomizer<T>) type.newInstance();
    } catch (IllegalAccessException | InvocationTargetException | InstantiationException e) {
        throw new ObjectGenerationException(
                format("Could not create Randomizer of type: %s with constructor arguments: %s", type,
                        Arrays.toString(randomizerArguments)),
                e);
    }
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Get active segments at given timestamp.
 * Perform binary search on index table to find the record corresponding to timestamp.
 * Note: index table may be stale or not reflect lastest state of history table.
 * So we may need to fall through in the history table from the record being pointed to by index
 * until we find the correct record.//from w w  w.jav a 2  s . c o  m
 *
 * @param timestamp    timestamp
 * @param indexTable   indextable
 * @param historyTable history table
 * @return
 */
public static List<Integer> getActiveSegments(final long timestamp, final byte[] indexTable,
        final byte[] historyTable) {
    Optional<HistoryRecord> record = HistoryRecord.readRecord(historyTable, 0, true);
    if (record.isPresent() && timestamp > record.get().getScaleTime()) {
        final Optional<IndexRecord> recordOpt = IndexRecord.search(timestamp, indexTable).getValue();
        final int startingOffset = recordOpt.isPresent() ? recordOpt.get().getHistoryOffset() : 0;

        record = findRecordInHistoryTable(startingOffset, timestamp, historyTable, true);
    }
    return record.map(HistoryRecord::getSegments).orElse(new ArrayList<>());
}

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From source file:org.kontalk.crypto.Coder.java

private static KeysResult getKeys(User user) {
    KeysResult result = new KeysResult();

    Optional<PersonalKey> optMyKey = AccountLoader.getInstance().getPersonalKey();
    if (!optMyKey.isPresent()) {
        LOGGER.log(Level.WARNING, "can't get personal key");
        result.errors.add(Error.MY_KEY_UNAVAILABLE);
        return result;
    }/*  w w  w.  j av a2 s.  c  o m*/
    result.myKey = optMyKey.get();

    if (!user.hasKey()) {
        LOGGER.warning("key not found for user, id: " + user.getID());
        result.errors.add(Error.KEY_UNAVAILABLE);
        return result;
    }

    Optional<PGPCoderKey> optKey = PGPUtils.readPublicKey(user.getKey());
    if (!optKey.isPresent()) {
        LOGGER.warning("can't get sender key");
        result.errors.add(Error.INVALID_KEY);
        return result;
    }
    result.otherKey = optKey.get();

    return result;
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Segment Table records are of fixed size.
 * So O(constant) operation to get segment given segmentTable Chunk.
 * <p>// ww w . jav  a 2  s .  c o m
 * Note: this method assumes you have supplied the correct chunk
 *
 * @param number       segment number
 * @param segmentTable segment table
 * @return
 */
public static Segment getSegment(final int number, final byte[] segmentTable) {

    Optional<SegmentRecord> recordOpt = SegmentRecord.readRecord(segmentTable, number);
    if (recordOpt.isPresent()) {
        SegmentRecord record = recordOpt.get();
        return new Segment(record.getSegmentNumber(), record.getStartTime(), record.getRoutingKeyStart(),
                record.getRoutingKeyEnd());
    } else {
        throw StoreException.create(StoreException.Type.DATA_NOT_FOUND,
                "Segment number: " + String.valueOf(number));
    }
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Current active segments correspond to last entry in the history table.
 * Until segment number is written to the history table it is not exposed to outside world
 * (e.g. callers - producers and consumers)
 *
 * @param historyTable history table/*from  w w  w. j  a va2  s .com*/
 * @return
 */
public static List<Integer> getActiveSegments(final byte[] historyTable) {
    final Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTable, true);

    return record.isPresent() ? record.get().getSegments() : new ArrayList<>();
}

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From source file:io.github.retz.web.JobRequestHandler.java

static String getFile(spark.Request req, spark.Response res) throws IOException {
    Optional<Job> job = getJobAndVerify(req);

    String file = req.queryParams("path");
    long offset = Long.parseLong(req.queryParams("offset"));
    long length = Long.parseLong(req.queryParams("length"));

    LOG.debug("get-file: path={}, offset={}, length={}", file, offset, length);
    res.type("application/json");

    Optional<FileContent> fileContent;
    if (job.isPresent() && job.get().url() != null // If url() is null, the job hasn't yet been started at Mesos
            && MesosHTTPFetcher.statHTTPFile(job.get().url(), file)) {
        Pair<Integer, String> payload = MesosHTTPFetcher.fetchHTTPFile(job.get().url(), file, offset, length);
        LOG.debug("Payload length={}, offset={}", payload.right().length(), offset);
        // TODO: what the heck happens when a file is not UTF-8 encodable???? How Mesos works?
        if (payload.left() == 200) {
            fileContent = Optional.ofNullable(MAPPER.readValue(payload.right(), FileContent.class));
        } else {/*  w  w  w.  j  a va 2  s .  c  o  m*/
            return MAPPER.writeValueAsString(new ErrorResponse(payload.right()));
        }
    } else {
        fileContent = Optional.empty();
    }
    GetFileResponse getFileResponse = new GetFileResponse(job, fileContent);
    getFileResponse.ok();
    res.status(200);

    return MAPPER.writeValueAsString(getFileResponse);
}

---

From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Add a new row to the history table. This row is only partial as it only contains list of segments.
 * Timestamp is added using completeHistoryRecord method.
 *
 * @param historyTable      history table
 * @param newActiveSegments new active segments
 * @return/*w  w  w.  j a  va2 s  .  c o m*/
 */
public static byte[] addPartialRecordToHistoryTable(final byte[] historyTable,
        final List<Integer> newActiveSegments) {
    final ByteArrayOutputStream historyStream = new ByteArrayOutputStream();
    Optional<HistoryRecord> last = HistoryRecord.readLatestRecord(historyTable, false);
    assert last.isPresent() && !(last.get().isPartial());

    try {
        historyStream.write(historyTable);
        historyStream.write(new HistoryRecord(last.get().getEpoch() + 1, newActiveSegments, historyTable.length)
                .toBytePartial());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return historyStream.toByteArray();
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Return segments in the epoch./*from  ww  w . ja  va2s  . co  m*/
 * @param historyTableData history table
 * @param epoch            epoch
 *
 * @return segments in the epoch
 */
public static List<Integer> getSegmentsInEpoch(byte[] historyTableData, int epoch) {
    Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTableData, false);

    while (record.isPresent() && record.get().getEpoch() > epoch) {
        record = HistoryRecord.fetchPrevious(record.get(), historyTableData);
    }

    return record.orElseThrow(() -> StoreException.create(StoreException.Type.DATA_NOT_FOUND,
            "Epoch: " + epoch + " not found in history table")).getSegments();
}

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From source file:io.pravega.controller.store.stream.tables.TableHelper.java

/**
 * Adds timestamp to the last record in the history table.
 *
 * @param historyTable         history table
 * @param partialHistoryRecord partial history record
 * @param timestamp            scale timestamp
 * @return/* ww w  . j  a v  a2s  . c o  m*/
 */
public static byte[] completePartialRecordInHistoryTable(final byte[] historyTable,
        final HistoryRecord partialHistoryRecord, final long timestamp) {
    Optional<HistoryRecord> record = HistoryRecord.readLatestRecord(historyTable, false);
    assert record.isPresent() && record.get().isPartial()
            && record.get().getEpoch() == partialHistoryRecord.getEpoch();
    final ByteArrayOutputStream historyStream = new ByteArrayOutputStream();

    try {
        historyStream.write(historyTable);

        historyStream
                .write(new HistoryRecord(partialHistoryRecord.getSegments(), partialHistoryRecord.getEpoch(),
                        timestamp, partialHistoryRecord.getOffset()).remainingByteArray());
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
    return historyStream.toByteArray();
}

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From source file:io.github.retz.web.WebConsole.java

public static boolean kill(int id) throws Exception {
    if (!driver.isPresent()) {
        LOG.error("Driver is not present; this setup should be wrong");
        return false;
    }/*from w w w.j  a  v a2  s .c  o m*/

    Optional<Boolean> result = Stanchion.call(() -> {
        // TODO: non-application owner is even possible to kill job
        Optional<String> maybeTaskId = JobQueue.cancel(id, "Canceled by user");

        // There's a slight pitfall between cancel above and kill below where
        // no kill may be sent, RetzScheduler is exactly in resourceOffers and being scheduled.
        // Then this protocol returns false for sure.
        if (maybeTaskId.isPresent()) {
            Protos.TaskID taskId = Protos.TaskID.newBuilder().setValue(maybeTaskId.get()).build();
            Protos.Status status = driver.get().killTask(taskId);
            LOG.info("Job id={} was running and killed.");
            return status == Protos.Status.DRIVER_RUNNING;
        }
        return false;
    });

    if (result.isPresent()) {
        return result.get();
    } else {
        return false;
    }
}

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