A --> C[Persistent Handles]
    C --> D[Multi-Channel]
    D --> E[RDMA Support]
    C --> F[Witness Protocol]
    D --> F
```

## Testing Strategy

### Unit Tests
- Individual component testing for each feature
- Mock-based testing for protocol interactions
- State machine validation

### Integration Tests
- Feature interaction testing
- Network failure simulation

import org.codelibs.fess.helper.WebFsIndexHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.mail.CardView;
import org.dbflute.mail.send.supplement.SMailPostingDiscloser;
import org.lastaflute.core.mail.Postbox;

import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link Chars}.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@NullMarked
public class CharsTest extends TestCase {

        activityHelper.setEnvMap(dockerEnv);
        activityHelper.init();
        assertTrue(activityHelper.useEcsFormat);
    }

    public void test_init_withNonDockerEnvironment() {
        Map<String, String> nonDockerEnv = new HashMap<>();
        nonDockerEnv.put("FESS_APP_TYPE", "standalone");
        activityHelper.setEnvMap(nonDockerEnv);
        activityHelper.init();
        assertFalse(activityHelper.useEcsFormat);
    }

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

import org.codelibs.fess.unit.UnitFessTestCase;

public class WebApiManagerTest extends UnitFessTestCase {

    public void test_matches_withPathBasedImplementation() {
        // Test simple path-based matching

import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.opensearch.config.exentity.WebConfig;
import org.codelibs.fess.thumbnail.ThumbnailManager;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.DocList;
import org.dbflute.optional.OptionalEntity;
import org.opensearch.action.bulk.BulkItemResponse;

import org.dbflute.dbmeta.name.ColumnRealName;
import org.dbflute.dbmeta.name.ColumnSqlName;
import org.dbflute.exception.InvalidQueryRegisteredException;
import org.dbflute.util.Srl;
import org.opensearch.common.unit.Fuzziness;
import org.opensearch.index.query.BoolQueryBuilder;
import org.opensearch.index.query.CommonTermsQueryBuilder;
import org.opensearch.index.query.ExistsQueryBuilder;
import org.opensearch.index.query.IdsQueryBuilder;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.unit.UnitFessTestCase;

import jakarta.validation.Constraint;
import jakarta.validation.Payload;

public class CustomSizeTest extends UnitFessTestCase {

    // Test field with CustomSize annotation for testing

import org.dbflute.dbmeta.name.ColumnRealName;
import org.dbflute.dbmeta.name.ColumnSqlName;
import org.dbflute.exception.InvalidQueryRegisteredException;
import org.dbflute.util.Srl;
import org.opensearch.common.unit.Fuzziness;
import org.opensearch.index.query.BoolQueryBuilder;
import org.opensearch.index.query.CommonTermsQueryBuilder;
import org.opensearch.index.query.ExistsQueryBuilder;
import org.opensearch.index.query.IdsQueryBuilder;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;

import org.codelibs.fess.api.WebApiManager;
import org.codelibs.fess.api.WebApiManagerFactory;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;

import jakarta.servlet.FilterChain;
import jakarta.servlet.FilterConfig;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;