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Java example source code file (LoggerFactory.java)
The LoggerFactory.java Java example source code/** * Copyright (c) 2004-2011 QOS.ch * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * */ package org.slf4j; import java.io.IOException; import java.net.URL; import java.util.ArrayList; import java.util.Arrays; import java.util.Enumeration; import java.util.LinkedHashSet; import java.util.List; import java.util.Set; import java.util.concurrent.LinkedBlockingQueue; import org.slf4j.event.SubstituteLoggingEvent; import org.slf4j.helpers.NOPLoggerFactory; import org.slf4j.helpers.SubstituteLogger; import org.slf4j.helpers.SubstituteLoggerFactory; import org.slf4j.helpers.Util; import org.slf4j.impl.StaticLoggerBinder; /** * The <code>LoggerFactory is a utility class producing Loggers for * various logging APIs, most notably for log4j, logback and JDK 1.4 logging. * Other implementations such as {@link org.slf4j.impl.NOPLogger NOPLogger} and * {@link org.slf4j.impl.SimpleLogger SimpleLogger} are also supported. * <p/> * <p/> * <code>LoggerFactory is essentially a wrapper around an * {@link ILoggerFactory} instance bound with <code>LoggerFactory at * compile time. * <p/> * <p/> * Please note that all methods in <code>LoggerFactory are static. * * * @author Alexander Dorokhine * @author Robert Elliot * @author Ceki Gülcü * */ public final class LoggerFactory { static final String CODES_PREFIX = "http://www.slf4j.org/codes.html"; static final String NO_STATICLOGGERBINDER_URL = CODES_PREFIX + "#StaticLoggerBinder"; static final String MULTIPLE_BINDINGS_URL = CODES_PREFIX + "#multiple_bindings"; static final String NULL_LF_URL = CODES_PREFIX + "#null_LF"; static final String VERSION_MISMATCH = CODES_PREFIX + "#version_mismatch"; static final String SUBSTITUTE_LOGGER_URL = CODES_PREFIX + "#substituteLogger"; static final String LOGGER_NAME_MISMATCH_URL = CODES_PREFIX + "#loggerNameMismatch"; static final String REPLAY_URL = CODES_PREFIX + "#replay"; static final String UNSUCCESSFUL_INIT_URL = CODES_PREFIX + "#unsuccessfulInit"; static final String UNSUCCESSFUL_INIT_MSG = "org.slf4j.LoggerFactory could not be successfully initialized. See also " + UNSUCCESSFUL_INIT_URL; static final int UNINITIALIZED = 0; static final int ONGOING_INITIALIZATION = 1; static final int FAILED_INITIALIZATION = 2; static final int SUCCESSFUL_INITIALIZATION = 3; static final int NOP_FALLBACK_INITIALIZATION = 4; static volatile int INITIALIZATION_STATE = UNINITIALIZED; static SubstituteLoggerFactory SUBST_FACTORY = new SubstituteLoggerFactory(); static NOPLoggerFactory NOP_FALLBACK_FACTORY = new NOPLoggerFactory(); // Support for detecting mismatched logger names. static final String DETECT_LOGGER_NAME_MISMATCH_PROPERTY = "slf4j.detectLoggerNameMismatch"; static final String JAVA_VENDOR_PROPERTY = "java.vendor.url"; static boolean DETECT_LOGGER_NAME_MISMATCH = Util.safeGetBooleanSystemProperty(DETECT_LOGGER_NAME_MISMATCH_PROPERTY); /** * It is LoggerFactory's responsibility to track version changes and manage * the compatibility list. * <p/> * <p/> * It is assumed that all versions in the 1.6 are mutually compatible. */ static private final String[] API_COMPATIBILITY_LIST = new String[] { "1.6", "1.7" }; // private constructor prevents instantiation private LoggerFactory() { } /** * Force LoggerFactory to consider itself uninitialized. * <p/> * <p/> * This method is intended to be called by classes (in the same package) for * testing purposes. This method is internal. It can be modified, renamed or * removed at any time without notice. * <p/> * <p/> * You are strongly discouraged from calling this method in production code. */ static void reset() { INITIALIZATION_STATE = UNINITIALIZED; } private final static void performInitialization() { bind(); if (INITIALIZATION_STATE == SUCCESSFUL_INITIALIZATION) { versionSanityCheck(); } } private static boolean messageContainsOrgSlf4jImplStaticLoggerBinder(String msg) { if (msg == null) return false; if (msg.contains("org/slf4j/impl/StaticLoggerBinder")) return true; if (msg.contains("org.slf4j.impl.StaticLoggerBinder")) return true; return false; } private final static void bind() { try { Set<URL> staticLoggerBinderPathSet = null; // skip check under android, see also // http://jira.qos.ch/browse/SLF4J-328 if (!isAndroid()) { staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet(); reportMultipleBindingAmbiguity(staticLoggerBinderPathSet); } // the next line does the binding StaticLoggerBinder.getSingleton(); INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION; reportActualBinding(staticLoggerBinderPathSet); fixSubstituteLoggers(); replayEvents(); // release all resources in SUBST_FACTORY SUBST_FACTORY.clear(); } catch (NoClassDefFoundError ncde) { String msg = ncde.getMessage(); if (messageContainsOrgSlf4jImplStaticLoggerBinder(msg)) { INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION; Util.report("Failed to load class \"org.slf4j.impl.StaticLoggerBinder\"."); Util.report("Defaulting to no-operation (NOP) logger implementation"); Util.report("See " + NO_STATICLOGGERBINDER_URL + " for further details."); } else { failedBinding(ncde); throw ncde; } } catch (java.lang.NoSuchMethodError nsme) { String msg = nsme.getMessage(); if (msg != null && msg.contains("org.slf4j.impl.StaticLoggerBinder.getSingleton()")) { INITIALIZATION_STATE = FAILED_INITIALIZATION; Util.report("slf4j-api 1.6.x (or later) is incompatible with this binding."); Util.report("Your binding is version 1.5.5 or earlier."); Util.report("Upgrade your binding to version 1.6.x."); } throw nsme; } catch (Exception e) { failedBinding(e); throw new IllegalStateException("Unexpected initialization failure", e); } } private static void fixSubstituteLoggers() { synchronized (SUBST_FACTORY) { SUBST_FACTORY.postInitialization(); for (SubstituteLogger substLogger : SUBST_FACTORY.getLoggers()) { Logger logger = getLogger(substLogger.getName()); substLogger.setDelegate(logger); } } } static void failedBinding(Throwable t) { INITIALIZATION_STATE = FAILED_INITIALIZATION; Util.report("Failed to instantiate SLF4J LoggerFactory", t); } private static void replayEvents() { final LinkedBlockingQueue<SubstituteLoggingEvent> queue = SUBST_FACTORY.getEventQueue(); final int queueSize = queue.size(); int count = 0; final int maxDrain = 128; List<SubstituteLoggingEvent> eventList = new ArrayList Other Java examples (source code examples)Here is a short list of links related to this Java LoggerFactory.java source code file: |
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