com.aspectran.undertow.server.handler.logging.ExchangeLoggingGroupHelper Maven / Gradle / Ivy

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/*
 * Copyright (c) 2008-2025 The Aspectran Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.aspectran.undertow.server.handler.logging;

import com.aspectran.core.support.logging.LoggingGroupHelper;
import com.aspectran.utils.annotation.jsr305.NonNull;
import com.aspectran.utils.annotation.jsr305.Nullable;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.AttachmentKey;

/*
 * Since logs are output asynchronously, the key to identify
 * the logging group from MDC should not be removed immediately.
 * In this case, the key may remain in the existing thread and
 * must be initialized or removed in the next request.
 */
public abstract class ExchangeLoggingGroupHelper {

    private static final AttachmentKey KEY = AttachmentKey.create(String.class);

    static void setTo(@NonNull HttpServerExchange exchange, @Nullable String groupName) {
        if (groupName != null) {
            LoggingGroupHelper.set(groupName);
            exchange.putAttachment(KEY, groupName);
        } else {
            LoggingGroupHelper.clear();
        }
    }

    static void setFrom(@NonNull HttpServerExchange exchange) {
        String groupName = exchange.getAttachment(KEY);
        if (groupName != null) {
            LoggingGroupHelper.set(groupName);
        } else {
            LoggingGroupHelper.clear();
        }
    }

}