001/* 002 * Copyright (C) 2023-present The Prometheus jmx_exporter Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package io.prometheus.jmx.logger; 018 019import java.util.logging.Level; 020 021/** Class to implement a Logger */ 022public class Logger { 023 024 private final java.util.logging.Logger LOGGER; 025 026 private final boolean JMX_PROMETHEUS_EXPORTER_DEVELOPER_DEBUG = 027 "true".equals(System.getenv("JMX_PROMETHEUS_EXPORTER_DEVELOPER_DEBUG")) 028 || "true".equals(System.getProperty("jmx.prometheus.exporter.developer.debug")); 029 030 /** 031 * Constructor 032 * 033 * @param clazz clazz 034 */ 035 Logger(Class<?> clazz) { 036 LOGGER = java.util.logging.Logger.getLogger(clazz.getName()); 037 } 038 039 /** 040 * Method to return whether a log level is enabled 041 * 042 * @param level level 043 * @return true if the log level is enabled, else false 044 */ 045 public boolean isLoggable(Level level) { 046 return LOGGER.isLoggable(level); 047 } 048 049 /** 050 * Method to log a message 051 * 052 * @param level level 053 * @param message message 054 * @param objects objects 055 */ 056 public void log(Level level, String message, Object... objects) { 057 if (LOGGER.isLoggable(level)) { 058 LOGGER.log(level, String.format(message, objects)); 059 } 060 061 if (JMX_PROMETHEUS_EXPORTER_DEVELOPER_DEBUG) { 062 System.out 063 .format("[%s] %s %s", level, LOGGER.getName(), String.format(message, objects)) 064 .println(); 065 } 066 } 067}