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feign-slf4j
There is a newer version: 8.18.0
/*
 * Copyright 2013 Netflix, Inc.
 *
 * 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 feign.slf4j;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;

import feign.Request;
import feign.Response;

/**
 * Logs to SLF4J at the debug level, if the underlying logger has debug logging enabled.  The
 * underlying logger can be specified at construction-time, defaulting to the logger for {@link
 * feign.Logger}.
 */
public class Slf4jLogger extends feign.Logger {

  private final Logger logger;

  public Slf4jLogger() {
    this(feign.Logger.class);
  }

  public Slf4jLogger(Class clazz) {
    this(LoggerFactory.getLogger(clazz));
  }

  public Slf4jLogger(String name) {
    this(LoggerFactory.getLogger(name));
  }

  Slf4jLogger(Logger logger) {
    this.logger = logger;
  }

  @Override
  protected void logRequest(String configKey, Level logLevel, Request request) {
    if (logger.isDebugEnabled()) {
      super.logRequest(configKey, logLevel, request);
    }
  }

  @Override
  protected Response logAndRebufferResponse(String configKey, Level logLevel, Response response,
                                            long elapsedTime) throws IOException {
    if (logger.isDebugEnabled()) {
      return super.logAndRebufferResponse(configKey, logLevel, response, elapsedTime);
    }
    return response;
  }

  @Override
  protected void log(String configKey, String format, Object... args) {
    // Not using SLF4J's support for parameterized messages (even though it would be more efficient) because it would
    // require the incoming message formats to be SLF4J-specific.
    logger.debug(String.format(methodTag(configKey) + format, args));
  }
}