*/
    public static class PropertiesReader extends LineNumberReader {
        /** Stores the comment lines for the currently processed property.*/
        private final List<String> commentLines;

        /** Stores the value lines for the currently processed property.*/
        private final List<String> valueLines;

        /** Stores the name of the last read property.*/
        private String propertyName;

     *
     * @param context the Tomcat context for this web resource root
     */
    public FessWebResourceRoot(final Context context) {
        super(context);
    }

    /**
     * Processes WEB-INF/lib directory and additionally scans WEB-INF/plugin for Fess plugins.
     * This method extends the standard processing to include plugin JAR files that contain
     * the "Fess-WebAppJar" manifest attribute.
     *

In particular, this may be a good alternative to logic in a middleware.

For example, if you want to read or manipulate the request body before it is processed by your application.

/// danger

This is an "advanced" feature.

If you are just starting with **FastAPI** you might want to skip this section.

///

## Use cases { #use-cases }

        br = new BufferedReader(new InputStreamReader(is, charset));
    }

    /**
     * Runs the thread to continuously read lines from the input stream.
     * Each line is processed by the output callback (if provided) and added to the buffer.
     * The buffer is maintained as a circular buffer with the specified size.
     */
    @Override
    public void run() {
        boolean running = true;

import org.opensearch.index.query.QueryBuilders;
import org.opensearch.index.query.RangeQueryBuilder;

/**
 * Command class for handling term range query execution and conversion.
 * This class processes Lucene TermRangeQuery objects and converts them to OpenSearch QueryBuilder instances.
 */
public class TermRangeQueryCommand extends QueryCommand {

import jakarta.servlet.ServletResponse;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

/**
 * Filter for handling Cross-Origin Resource Sharing (CORS) requests.
 * Processes CORS headers and handles preflight OPTIONS requests.
 */
public class CorsFilter implements Filter {

    /**
     * Creates a new instance of CorsFilter.
     */
    public CorsFilter() {

        } catch (final Exception e) {
            throw new SuggesterException("Failed to execute request: " + getClass().getSimpleName(), e);
        }
        return deferred.promise();
    }

    /**
     * Processes the request.
     * @param client The OpenSearch client.
     * @param deferred The Deferred object to resolve or reject the response.
     */
    protected abstract void processRequest(Client client, Deferred<T> deferred);

* Systemd
* Supervisor
* 클라우드 제공자가 서비스 일부로 내부적으로 처리
* 기타...

## 복제 - 프로세스와 메모리 { #replication-processes-and-memory }

FastAPI 애플리케이션은 Uvicorn을 실행하는 `fastapi` 명령 같은 서버 프로그램을 사용하면, **하나의 프로세스**로 실행하더라도 여러 클라이언트를 동시에 처리할 수 있습니다.

하지만 많은 경우, 여러 워커 프로세스를 동시에 실행하고 싶을 것입니다.

### 여러 프로세스 - 워커 { #multiple-processes-workers }

                } else {
                    logger.warn(message, e);
                }
            }
            response.sendError(statusCode, message);
        }
    }

    /**
     * Processes API requests to the search engine.
     * Handles both regular API calls and plugin requests.
     *
     * @param request  the HTTP servlet request
     * @param response the HTTP servlet response

import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;

/**
 * Helper class for managing data crawling operations in Fess.
 * This class coordinates the execution of data store crawling processes,
 * managing multiple concurrent crawling threads and handling the indexing
 * of crawled documents into the search engine.
 *
 * <p>The DataIndexHelper supports:</p>
 * <ul>