spring LogFactory 源码

spring LogFactory 代码

文件路径：/spring-jcl/src/main/java/org/apache/commons/logging/LogFactory.java

/*
 * Copyright 2002-2019 the original author or authors.
 *
 * 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
 *
 *      https://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 org.apache.commons.logging;

/**
 * A minimal incarnation of Apache Commons Logging's {@code LogFactory} API,
 * providing just the common {@link Log} lookup methods. This is inspired
 * by the JCL-over-SLF4J bridge and should be source as well as binary
 * compatible with all common use of the Commons Logging API (in particular:
 * with {@code LogFactory.getLog(Class/String)} field initializers).
 *
 * <p>This implementation does not support Commons Logging's original provider
 * detection. It rather only checks for the presence of the Log4j 2.x API
 * and the SLF4J 1.7 API in the Spring Framework classpath, falling back to
 * {@code java.util.logging} if none of the two is available. In that sense,
 * it works as a replacement for the Log4j 2 Commons Logging bridge as well as
 * the JCL-over-SLF4J bridge, both of which become irrelevant for Spring-based
 * setups as a consequence (with no need for manual excludes of the standard
 * Commons Logging API jar anymore either). Furthermore, for simple setups
 * without an external logging provider, Spring does not require any extra jar
 * on the classpath anymore since this embedded log factory automatically
 * delegates to {@code java.util.logging} in such a scenario.
 *
 * <p><b>Note that this Commons Logging variant is only meant to be used for
 * infrastructure logging purposes in the core framework and in extensions.</b>
 * It also serves as a common bridge for third-party libraries using the
 * Commons Logging API, e.g. Apache HttpClient, and HtmlUnit, bringing
 * them into the same consistent arrangement without any extra bridge jars.
 *
 * <p><b>For logging need in application code, prefer direct use of Log4j 2.x
 * or SLF4J or {@code java.util.logging}.</b> Simply put Log4j 2.x or Logback
 * (or another SLF4J provider) onto your classpath, without any extra bridges,
 * and let the framework auto-adapt to your choice.
 *
 * @author Juergen Hoeller (for the {@code spring-jcl} variant)
 * @since 5.0
 */
public abstract class LogFactory {

	/**
	 * Convenience method to return a named logger.
	 * @param clazz containing Class from which a log name will be derived
	 */
	public static Log getLog(Class<?> clazz) {
		return getLog(clazz.getName());
	}

	/**
	 * Convenience method to return a named logger.
	 * @param name logical name of the <code>Log</code> instance to be returned
	 */
	public static Log getLog(String name) {
		return LogAdapter.createLog(name);
	}


	/**
	 * This method only exists for compatibility with unusual Commons Logging API
	 * usage like e.g. {@code LogFactory.getFactory().getInstance(Class/String)}.
	 * @see #getInstance(Class)
	 * @see #getInstance(String)
	 * @deprecated in favor of {@link #getLog(Class)}/{@link #getLog(String)}
	 */
	@Deprecated
	public static LogFactory getFactory() {
		return new LogFactory() {};
	}

	/**
	 * Convenience method to return a named logger.
	 * <p>This variant just dispatches straight to {@link #getLog(Class)}.
	 * @param clazz containing Class from which a log name will be derived
	 * @deprecated in favor of {@link #getLog(Class)}
	 */
	@Deprecated
	public Log getInstance(Class<?> clazz) {
		return getLog(clazz);
	}

	/**
	 * Convenience method to return a named logger.
	 * <p>This variant just dispatches straight to {@link #getLog(String)}.
	 * @param name logical name of the <code>Log</code> instance to be returned
	 * @deprecated in favor of {@link #getLog(String)}
	 */
	@Deprecated
	public Log getInstance(String name) {
		return getLog(name);
	}

}

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