Suggestion

package com.aurora.intelligence.scheduling;

import com.aurora.intelligence.SyntaxService;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadPoolExecutor;

public class RedisConsumer {
    private final RedisService redisService;

    @Autowired
    private SyntaxService syntaxService;

    private ThreadPoolExecutor executor;

    private static final Logger LOGGER = LoggerFactory.getLogger(RedisConsumer.class);

    public RedisConsumer(RedisService redisService, ThreadPoolExecutor executor) {
        this.redisService = redisService;
        this.executor = executor;
    }

    @Scheduled(fixedRate = 1000)
    private void receive() throws JsonParseException, JsonMappingException, IOException {
        if (executor.getActiveCount() >= executor.getMaximumPoolSize()) {
            return;
        }

        RedisMessage redisMessage = redisService.getRedisMessage(
                RedisMessageType.STATEMENT_DATA,
                RedisMessageType.CRAWLING_DATA
        );

        if (redisMessage != null) {
            LOGGER.info("Found message type: " + redisMessage.getType());
            LOGGER.info("Currently " + executor.getActiveCount() + " out of " +
                    executor.getMaximumPoolSize() + " threads are busy.");
            LOGGER.info("Tasks in work queue: " + redisService.getWorkQueueSize());

            if (redisMessage.getType() == RedisMessageType.STATEMENT_DATA) {

                Statement statement = redisService.getDataObject(redisMessage, Statement.class);
                executor.submit(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            LOGGER.info("Analyzing " + statement.getOriginalStatementId() + " : " +
                                    statement.getText());
                            AnalyzedText res = syntaxService.analyze(
                                    statement.getText(),
                                    statement.getAnnotations(),
                                    statement.getOriginalStatementId());
                            updateStatementWithAnalyzedText(res, statement);

                            redisService.addMessage(redisMessage, statement);

                        } catch (Exception e) {
                            statement.setStatus(ProcessingStatus.FAULTY);
                            redisService.handleFailure(redisMessage, e);
                        }
                    }
                });
            } else if (redisMessage.getType() == RedisMessageType.CRAWLING_DATA) {

                CrawlingMessage crawlingMessage = redisService.getDataObject(redisMessage, CrawlingMessage.class);

                ScrapingResultDTO wrapper = crawlingMessage.getResult();
                if (wrapper == null) {
                    redisService.handleFailure(redisMessage, new Exception("Scraping result is null"));
                }

                executor.submit(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            List<ScrapingResultDTO> scrapingResults = new ArrayList<>();
                            scrapingResults.add(wrapper);
                            if (wrapper.getChildren() != null && wrapper.getChildren().size() > 0) {
                                hierarchicalKUR(wrapper.getChildren(), scrapingResults);
                            }

                            for (ScrapingResultDTO result : scrapingResults) {
                                if (result.getResult() == null || result.getResult().get("description") == null) {
                                    LOGGER.warn("The scraping result has no description - SKIP");
                                    continue;
                                }

                                String text = result.getResult().get("description");
                                AnalyzedText res = syntaxService.analyze(text);
                                Statement statement = new Statement();
                                updateStatementWithAnalyzedText(res, statement);
                                statement.setText(text);

                                redisService.addMessage(redisMessage, statement);
                            }
                        } catch (Exception e) {
                            redisService.handleFailure(redisMessage, e);
                        }
                    }
                });
            }
        }
    }

    private static void hierarchicalKUR(List<ScrapingResultDTO> wrapper, List<ScrapingResultDTO> list) {
        if (wrapper != null && !wrapper.isEmpty()) {

            for (ScrapingResultDTO dto : wrapper) {
                list.add(dto);
                if (dto.getChildren() != null && dto.getChildren().size() > 0) {
                    hierarchicalKUR(dto.getChildren(), list);
                }
            }

        }
    }

    private static void updateStatementWithAnalyzedText(AnalyzedText res, Statement statement) {
        statement.setSentences(res.getSentences());
        statement.setFrequencyAnalysis(res.getFrequencyAnalysis());
        statement.setStatus(ProcessingStatus.PROCESSED);
    }
}