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Source Code for Apache Log4j API
Apache Log4j API
provides the interface that applications should code to and provides the adapter
components required for implementers to create a logging implementation.
Apache Log4j API is a required module to use Apache Log4j.
Bytecode (Java 8) for Apache Log4j API is provided in a separate JAR file like log4j-api-2.14.1.jar.
Source Code files for Apache Log4j API are provided in both binary packge like apache-log4j-2.14.1-bin.zip and source package like apache-log4j-2.14.1-src.zip. You can download them at Apache Log4j Website.
You can also browse Source Code files for Apache Log4j API 2.14.1 below.
✍: FYIcenter.com
⏎ org/apache/logging/log4j/message/Message.java
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 org.apache.logging.log4j.message; import java.io.Serializable; import org.apache.logging.log4j.util.StringBuilderFormattable; /** * An interface for various Message implementations that can be logged. Messages can act as wrappers * around Objects so that user can have control over converting Objects to Strings when necessary without * requiring complicated formatters and as a way to manipulate the message based on information available * at runtime such as the locale of the system. * <p> * Custom Message implementations should consider implementing the {@link StringBuilderFormattable} * interface for more efficient processing. Garbage-free Layouts will call * {@link StringBuilderFormattable#formatTo(StringBuilder) formatTo(StringBuilder)} instead of * {@link Message#getFormattedMessage()} if the Message implements StringBuilderFormattable. * </p> * <p> * Note: Message objects should not be considered to be thread safe nor should they be assumed to be * safely reusable even on the same thread. The logging system may provide information to the Message * objects and the Messages might be queued for asynchronous delivery. Thus, any modifications to a * Message object by an application should by avoided after the Message has been passed as a parameter on * a Logger method. * </p> * * @see StringBuilderFormattable */ /* * Implementation note: this interface extends Serializable since LogEvents must be serializable. */ public interface Message extends Serializable { /** * Gets the Message formatted as a String. Each Message implementation determines the * appropriate way to format the data encapsulated in the Message. Messages that provide * more than one way of formatting the Message will implement MultiformatMessage. * <p> * When configured to log asynchronously, this method is called before the Message is queued, unless this * message implements {@link ReusableMessage} or is annotated with {@link AsynchronouslyFormattable}. * This gives the Message implementation class a chance to create a formatted message String with the current value * of any mutable objects. * The intention is that the Message implementation caches this formatted message and returns it on subsequent * calls. (See <a href="https://issues.apache.org/jira/browse/LOG4J2-763">LOG4J2-763</a>.) * </p> * <p> * When logging synchronously, this method will not be called for Messages that implement the * {@link StringBuilderFormattable} interface: instead, the * {@link StringBuilderFormattable#formatTo(StringBuilder) formatTo(StringBuilder)} method will be called so the * Message can format its contents without creating intermediate String objects. * </p> * * @return The message String. */ String getFormattedMessage(); /** * Gets the format portion of the Message. * * @return The message format. Some implementations, such as ParameterizedMessage, will use this as * the message "pattern". Other Messages may simply return an empty String. * TODO Do all messages have a format? What syntax? Using a Formatter object could be cleaner. * (RG) In SimpleMessage the format is identical to the formatted message. In ParameterizedMessage and * StructuredDataMessage it is not. It is up to the Message implementer to determine what this * method will return. A Formatter is inappropriate as this is very specific to the Message * implementation so it isn't clear to me how having a Formatter separate from the Message would be cleaner. */ String getFormat(); /** * Gets parameter values, if any. * * @return An array of parameter values or null. */ Object[] getParameters(); /** * Gets the throwable, if any. * * @return the throwable or null. */ Throwable getThrowable(); }
⏎ org/apache/logging/log4j/message/Message.java
Or download all of them as a single archive file:
File name: log4j-api-2.14.1-sources.jar File size: 264773 bytes Release date: 2021-03-06 Download
⇒ Source Code for Apache Log4j Core Implementation
⇐ Downloading Apache Log4j Binary Package
2015-11-17, 23333👍, 0💬
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