Example usage for java.util Queue poll

Introduction

In this page you can find the example usage for java.util Queue poll.

Prototype

E poll();

Source Link

Document

Retrieves and removes the head of this queue, or returns null if this queue is empty.

Usage

From source file:com.mgmtp.jfunk.common.util.Configuration.java

/**
 * If properties are present which start with {@link JFunkConstants#SYSTEM_PROPERTIES} the
 * corresponding values are taken as property files and loaded here.
 *//*from   w  w w .j a v  a  2  s. c o m*/
private void loadExtraFiles(final String filterPrefix, final boolean preserveExisting) {
    Map<String, String> view = Maps.filterKeys(this, Predicates.startsWith(filterPrefix));
    while (true) {
        if (view.isEmpty()) {
            break;
        }

        Queue<String> fileKeys = Queues.newArrayDeque(view.values());

        // we need to keep them separately in order to be able to reload them (see put method)
        extraFileProperties.addAll(fileKeys);

        // Remove original keys in order to prevent a stack overflow
        view.clear();

        for (String fileNameKey = null; (fileNameKey = fileKeys.poll()) != null;) {
            // Recursion
            String fileName = processPropertyValue(fileNameKey);
            if (PLACEHOLDER_PATTERN.matcher(fileName).find()) {
                // not all placeholders were resolved, so we enqueue it again to process another file first
                fileKeys.offer(fileName);
            } else {
                load(fileName, preserveExisting);
            }
        }
    }
}

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From source file:org.eclipse.skalli.core.search.LuceneIndex.java

private List<IndexEntry> indexEntity(T entity) {
    List<IndexEntry> fields = new LinkedList<IndexEntry>();

    Queue<EntityBase> queue = new LinkedList<EntityBase>();
    queue.add(entity);/*from  www.  java2s  . com*/

    while (!queue.isEmpty()) {
        EntityBase currentEntity = queue.poll();

        for (ExtensionService<?> extensionService : ExtensionServices.getAll()) {
            if (currentEntity.getClass().equals(extensionService.getExtensionClass())) {
                Indexer<?> indexer = extensionService.getIndexer();
                if (indexer != null) {
                    indexer.indexEntity(fields, currentEntity);
                }
            }
        }

        if (currentEntity instanceof ExtensibleEntityBase) {
            queue.addAll(((ExtensibleEntityBase) currentEntity).getAllExtensions());
        }
    }
    return fields;
}

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From source file:com.clustercontrol.jobmanagement.util.JobMultiplicityCache.java

/**
 * ??// ww  w .j a  v a  2  s  . co m
 * ??????????????????
 *
 * @param facilityId
 * @return
 */
public static void kick(String facilityId) {
    m_log.debug("kick " + facilityId);

    boolean kickFlag = false;

    try {
        _lock.writeLock();

        HashMap<String, Queue<JobSessionNodeEntityPK>> waitingCache = getWaitingCache();
        HashMap<String, Queue<JobSessionNodeEntityPK>> runningCache = getRunningCache();

        Queue<JobSessionNodeEntityPK> waitingQueue = waitingCache.get(facilityId);
        Queue<JobSessionNodeEntityPK> runningQueue = runningCache.get(facilityId);

        if (waitingQueue == null || waitingQueue.size() == 0) {
            return;
        }

        if (runningQueue == null) {
            runningQueue = new LinkedList<JobSessionNodeEntityPK>();
            runningCache.put(facilityId, runningQueue);
        }

        if (isRunNow(facilityId)) {
            JpaTransactionManager jtm = new JpaTransactionManager();
            try {
                jtm.begin();
                JobSessionNodeEntityPK pk = waitingQueue.peek(); //// waitQueue??(??????)
                m_log.debug("kick remove waitQueue : " + pk);
                int status = new JobSessionNodeImpl().wait2running(pk);
                // ?
                if (status == 0) {
                    m_log.debug("kick add runningQueue : " + pk);
                    waitingQueue.poll(); //// waitQueue?
                    runningQueue.offer(pk); //// runningQueue?
                    kickFlag = true;
                }
                // ??????????
                else if (status == 1) {
                    m_log.debug("kick not add runningQueue : " + pk);
                    waitingQueue.poll(); //// waitQueue?
                    kickFlag = true;
                }
                jtm.commit();
            } catch (Exception e) {
                m_log.warn("kick : " + e.getClass().getSimpleName() + ", " + e.getMessage(), e);
                jtm.rollback();
            } finally {
                jtm.close();
            }
        }

        storeWaitingCache(waitingCache);
        storeRunningCache(runningCache);

        if (m_log.isDebugEnabled()) {
            for (JobSessionNodeEntityPK q : runningQueue) {
                m_log.debug("kick runningQueue : " + q);
            }
            for (JobSessionNodeEntityPK q : waitingQueue) {
                m_log.debug("kick waitQueue : " + q);
            }
        }

        if (kickFlag) {
            kick(facilityId);
        }
    } finally {
        _lock.writeUnlock();
    }
}

---

From source file:com.connection.factory.SftpConnectionApacheLib.java

@Override
public void readAllFilesWalkingPathWithListener(FileListener listener, String remotePath) {
    //     List<RemoteFileObject> willReturnObject = new ArrayList<>();
    Queue<RemoteFileObject> directorylist = new LinkedBlockingQueue<>();
    RemoteFileObject object = null;/*from   w ww.  j a va2 s. c  o m*/
    object = new FtpApacheFileObject(FileInfoEnum.DIRECTORY);
    object.setDirectPath(remotePath);
    directorylist.add(object);
    try {
        while (!directorylist.isEmpty()) {
            object = directorylist.poll();
            List<ChannelSftp.LsEntry> list = command.ls(object.getPath());
            for (ChannelSftp.LsEntry each : list) {
                if (each.getFilename().equals(".") || each.getFilename().equals("..")) {
                    continue;
                }
                RemoteFileObject objectTemp = null;
                SftpATTRS attributes = each.getAttrs();
                if (attributes.isDir()) {
                    objectTemp = new SftpApacheFileObject(FileInfoEnum.DIRECTORY);
                    objectTemp.setFileName(each.getFilename());
                    objectTemp.setAbsolutePath(object.getPath());
                    directorylist.add(objectTemp);
                } else if (attributes.isReg()) {
                    objectTemp = new SftpApacheFileObject(FileInfoEnum.FILE);
                    objectTemp.setFileName(each.getFilename());
                    objectTemp.setAbsolutePath(object.getPath());
                    objectTemp.setFileSize(attributes.getSize());
                    objectTemp.setDate(attributes.getMtimeString());
                    objectTemp.setFileType();
                    listener.handleRemoteFile(object);
                }
            }
            object = null;
            list = null;
        }

    } catch (ConnectionException | SftpException ex) {
        //  ex.printStackTrace();
    }
    //return willReturnObject;
}

---

From source file:com.connection.factory.SftpConnectionApacheLib.java

@Override
public List<RemoteFileObject> readAllFilesWalkinPath(String remotePath) {
    List<RemoteFileObject> willReturnObject = new ArrayList<>();
    Queue<RemoteFileObject> directorylist = new LinkedBlockingQueue<>();
    RemoteFileObject object = null;/*from   w w w . ja va2s.co  m*/
    object = new FtpApacheFileObject(FileInfoEnum.DIRECTORY);
    object.setDirectPath(remotePath);
    directorylist.add(object);
    try {
        while (!directorylist.isEmpty()) {
            object = directorylist.poll();
            List<ChannelSftp.LsEntry> list = command.ls(object.getPath());
            for (ChannelSftp.LsEntry each : list) {
                if (each.getFilename().equals(".") || each.getFilename().equals("..")) {
                    continue;
                }
                RemoteFileObject objectTemp = null;
                SftpATTRS attributes = each.getAttrs();
                if (attributes.isDir()) {
                    objectTemp = new SftpApacheFileObject(FileInfoEnum.DIRECTORY);
                    objectTemp.setFileName(each.getFilename());
                    objectTemp.setAbsolutePath(object.getPath());
                    directorylist.add(objectTemp);
                } else if (attributes.isReg()) {
                    objectTemp = new SftpApacheFileObject(FileInfoEnum.FILE);
                    objectTemp.setFileName(each.getFilename());
                    objectTemp.setAbsolutePath(object.getPath());
                    objectTemp.setFileSize(attributes.getSize());
                    objectTemp.setDate(attributes.getMtimeString());
                    objectTemp.setFileType();
                    willReturnObject.add(objectTemp);
                }
            }
            object = null;
            list = null;
        }

    } catch (ConnectionException | SftpException ex) {
        ex.printStackTrace();
    }
    return willReturnObject;
}

---

From source file:net.dv8tion.jda.audio.AudioConnection.java

private void setupCombinedExecutor() {
    if (combinedAudioExecutor == null) {
        combinedAudioExecutor = Executors.newSingleThreadScheduledExecutor(
                r -> new Thread(r, "AudioConnection CombinedAudio Guild: " + channel.getGuild().getId()));
        combinedAudioExecutor.scheduleAtFixedRate(() -> {
            try {
                List<User> users = new LinkedList<>();
                List<short[]> audioParts = new LinkedList<>();
                if (receiveHandler != null && receiveHandler.canReceiveCombined()) {
                    long currentTime = System.currentTimeMillis();
                    for (Map.Entry<User, Queue<Pair<Long, short[]>>> entry : combinedQueue.entrySet()) {
                        User user = entry.getKey();
                        Queue<Pair<Long, short[]>> queue = entry.getValue();

                        if (queue.isEmpty())
                            continue;

                        Pair<Long, short[]> audioData = queue.poll();
                        //Make sure the audio packet is younger than 100ms
                        while (audioData != null && currentTime - audioData.getLeft() > queueTimeout) {
                            audioData = queue.poll();
                        }/*from   www . j av  a2 s .  c o  m*/

                        //If none of the audio packets were younger than 100ms, then there is nothing to add.
                        if (audioData == null) {
                            continue;
                        }
                        users.add(user);
                        audioParts.add(audioData.getRight());
                    }

                    if (!audioParts.isEmpty()) {
                        int audioLength = audioParts.get(0).length;
                        short[] mix = new short[1920]; //960 PCM samples for each channel
                        int sample;
                        for (int i = 0; i < audioLength; i++) {
                            sample = 0;
                            for (short[] audio : audioParts) {
                                sample += audio[i];
                            }
                            if (sample > Short.MAX_VALUE)
                                mix[i] = Short.MAX_VALUE;
                            else if (sample < Short.MIN_VALUE)
                                mix[i] = Short.MIN_VALUE;
                            else
                                mix[i] = (short) sample;
                        }
                        receiveHandler.handleCombinedAudio(new CombinedAudio(users, mix));
                    } else {
                        //No audio to mix, provide 20 MS of silence. (960 PCM samples for each channel)
                        receiveHandler
                                .handleCombinedAudio(new CombinedAudio(new LinkedList(), new short[1920]));
                    }
                }
            } catch (Exception e) {
                LOG.log(e);
            }
        }, 0, 20, TimeUnit.MILLISECONDS);
    }
}

---

From source file:ch.mlutz.plugins.t4e.index.TapestryIndexer.java

/**
 * Iterates all folders and looks for *.specification files in a folder
 * named WEB-INF./*  www .j  a  v  a 2s. c  o m*/
 *
 * @param project
 * @return
 */
public List<TapestryModule> createModulesForProject(IProject project) {

    // the queue storing the potential app specification files
    Queue<IFile> appSpecificationFiles = new LinkedList<IFile>();

    /*
    // add all children folders of project
    for (IResource member: project.members()) {
       if (member.getType() == IResource.FOLDER) {
    folderQueue.add((IFolder) member);
       }
    }
    */

    // the queue used for breadth first search
    Queue<IContainer> containerQueue = new LinkedList<IContainer>();
    containerQueue.add(project);

    IContainer currentContainer;
    while ((currentContainer = containerQueue.poll()) != null) {

        try {
            if (!TapestryModule.WEB_INF_FOLDER_NAME.equals(currentContainer.getName())) {

                // add all children folders of project
                for (IResource member : currentContainer.members()) {
                    if (member.getType() == IResource.FOLDER) {
                        containerQueue.add((IContainer) member);
                    }
                }
            } else {
                // add all children folders of project and check files for
                // specification
                for (IResource member : currentContainer.members()) {
                    if (member.getType() == IResource.FOLDER) {
                        containerQueue.add((IContainer) member);
                    } else if (member.getType() == IResource.FILE && isAppSpecification((IFile) member)) {
                        appSpecificationFiles.add((IFile) member);
                    }
                }

            }
        } catch (CoreException e) {
            log.warn("Couldn't iterate container " + currentContainer.getName(), e);
        }
    } // while

    List<TapestryModule> result = new ArrayList<TapestryModule>();

    IFile currentFile;
    while ((currentFile = appSpecificationFiles.poll()) != null) {

        try {
            TapestryModule tapestryModule = new TapestryModule(currentFile, this);
            result.add(tapestryModule);
        } catch (TapestryException e) {
            log.warn("Couldn't validate tapestryModule for app specification" + " file " + currentFile.getName()
                    + " in project " + project.getName() + ": ", e);
        }
    }

    return result;
}

---

From source file:org.unitime.timetable.solver.curricula.CurriculaCourseDemands.java

protected void computeTargetShare(int nrStudents, Collection<CurriculumCourse> courses,
        CurriculumCourseGroupsProvider course2groups, CurModel model) {
    for (CurriculumCourse c1 : courses) {
        float x1 = c1.getPercShare() * nrStudents;
        Set<CurriculumCourse>[] group = new HashSet[] { new HashSet<CurriculumCourse>(),
                new HashSet<CurriculumCourse>() };
        Queue<CurriculumCourse> queue = new LinkedList<CurriculumCourse>();
        queue.add(c1);//from ww  w .j a v  a  2 s.  c  om
        Set<CurriculumCourseGroup> done = new HashSet<CurriculumCourseGroup>();
        while (!queue.isEmpty()) {
            CurriculumCourse c = queue.poll();
            for (CurriculumCourseGroup g : course2groups.getGroups(c))
                if (done.add(g))
                    for (CurriculumCourse x : courses)
                        if (!x.equals(c) && !x.equals(c1) && course2groups.getGroups(x).contains(g)
                                && group[group[0].contains(c) ? 0 : g.getType()].add(x))
                            queue.add(x);
        }
        for (CurriculumCourse c2 : courses) {
            float x2 = c2.getPercShare() * nrStudents;
            if (c1.getUniqueId() >= c2.getUniqueId())
                continue;
            float share = c1.getPercShare() * c2.getPercShare() * nrStudents;
            boolean opt = group[0].contains(c2);
            boolean req = !opt && group[1].contains(c2);
            model.setTargetShare(c1.getUniqueId(), c2.getUniqueId(), opt ? 0.0 : req ? Math.min(x1, x2) : share,
                    true);
        }
    }
}

---

From source file:it.geosolutions.geobatch.destination.action.datamigration.RasterMigrationAction.java

@Override
public Queue<EventObject> execute(Queue<EventObject> events) throws ActionException {
    listenerForwarder.setTask("Check configuration");
    checkConfiguration();/*w ww  .  jav a 2s .c  o  m*/
    // Creation of a List containing the event objects
    final LinkedList<EventObject> ret = new LinkedList<EventObject>();
    try {
        // Start of the operations
        listenerForwarder.started();
        // Until the events are present, the input files are elaborated
        while (!events.isEmpty()) {
            // Each event is polled from the list
            EventObject event = events.poll();
            if (event instanceof FileSystemEvent) {
                FileSystemEvent fse = (FileSystemEvent) event;
                File file = fse.getSource();
                // Copy
                doProcess(FilenameUtils.getBaseName(file.getName()));
            }
            // pass the feature config to the next action
            ret.add(new FileSystemEvent(((FileSystemEvent) event).getSource(), FileSystemEventType.FILE_ADDED));
        }
        listenerForwarder.completed();
        return ret;
    } catch (Exception t) {
        listenerForwarder.failed(t);
        throw new ActionException(this, t.getMessage(), t);
    }
}

---

From source file:org.apache.synapse.transport.passthru.DeliveryAgent.java

/**
 * This method queues the message for delivery. If a connection is already existing for
 * the destination epr, the message will be delivered immediately. Otherwise message has
 * to wait until a connection is established. In this case this method will inform the
 * system about the need for a connection.
 *
 * @param msgContext the message context to be sent
 * @param epr the endpoint to which the message should be sent
 * @throws AxisFault if an error occurs/*from w  w w.  j ava2s  .co m*/
 */
public void submit(MessageContext msgContext, EndpointReference epr) throws AxisFault {
    try {
        URL url = new URL(epr.getAddress());
        String scheme = url.getProtocol() != null ? url.getProtocol() : "http";
        String hostname = url.getHost();
        int port = url.getPort();
        if (port == -1) {
            // use default
            if ("http".equals(scheme)) {
                port = 80;
            } else if ("https".equals(scheme)) {
                port = 443;
            }
        }
        HttpHost target = new HttpHost(hostname, port, scheme);
        boolean secure = "https".equalsIgnoreCase(target.getSchemeName());

        HttpHost proxy = proxyConfig.selectProxy(target);
        HttpRoute route;
        if (proxy != null) {
            route = new HttpRoute(target, null, proxy, secure);
        } else {
            route = new HttpRoute(target, null, secure);
        }

        // first we queue the message
        Queue<MessageContext> queue = null;
        lock.lock();
        try {
            queue = waitingMessages.get(route);
            if (queue == null) {
                queue = new ConcurrentLinkedQueue<MessageContext>();
                waitingMessages.put(route, queue);
            }
            if (queue.size() == maxWaitingMessages) {
                MessageContext msgCtx = queue.poll();

                targetErrorHandler.handleError(msgCtx, ErrorCodes.CONNECTION_TIMEOUT,
                        "Error connecting to the back end", null, ProtocolState.REQUEST_READY);
            }

            queue.add(msgContext);
        } finally {
            lock.unlock();
        }

        NHttpClientConnection conn = targetConnections.getConnection(route);
        if (conn != null) {
            conn.resetInput();
            conn.resetOutput();
            MessageContext messageContext = queue.poll();

            if (messageContext != null) {
                tryNextMessage(messageContext, route, conn);
            }
        }

    } catch (MalformedURLException e) {
        handleException("Malformed URL in the target EPR", e);
    }
}

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