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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.rapiddweller.common;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import java.util.HashSet;
import java.util.Set;

/**
 * Logs escalations to a logger.
 *
 * @author Volker Bergmann
 * @since 0.2.04
 */
public class LoggerEscalator implements Escalator {

  private final Set escalations;

  /**
   * Instantiates a new Logger escalator.
   */
  public LoggerEscalator() {
    this.escalations = new HashSet<>();
  }

  @Override
  public void escalate(String message, Object originator, Object cause) {
    // determine logger by the originator
    Class category = null;
    if (originator != null) {
      if (originator instanceof Class) {
        category = (Class) originator;
      } else {
        category = originator.getClass();
      }
    } else {
      originator = this.getClass();
    }
    Logger logger = LogManager.getLogger(category);
    // create escalation
    Escalation escalation = new Escalation(message, originator, cause);
    // if the escalation is new, send it
    if (!escalations.contains(escalation)) {
      escalations.add(escalation);
      if (cause instanceof Throwable) {
        logger.warn(escalation.toString(), (Throwable) cause);
      } else {
        logger.warn(escalation.toString());
      }
    }
  }
}