001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.spi.log;
020
021/**
022 * A simple logger to facilitate emission of diagnostic messages. In general, unrecoverable errors should be reported
023 * via exceptions and informational notifications should be reported via events, hence this logger interface focuses on
024 * support for tracing.
025 *
026 * @deprecated Use SLF4J instead
027 */
028@Deprecated
029public interface Logger {
030
031    /**
032     * Indicates whether debug logging is enabled.
033     *
034     * @return {@code true} if debug logging is enabled, {@code false} otherwise.
035     */
036    boolean isDebugEnabled();
037
038    /**
039     * Emits the specified message.
040     *
041     * @param msg The message to log, must not be {@code null}.
042     */
043    void debug(String msg);
044
045    /**
046     * Emits the specified message along with a stack trace of the given exception.
047     *
048     * @param msg The message to log, must not be {@code null}.
049     * @param error The exception to log, may be {@code null}.
050     */
051    void debug(String msg, Throwable error);
052
053    /**
054     * Indicates whether warn logging is enabled.
055     *
056     * @return {@code true} if warn logging is enabled, {@code false} otherwise.
057     */
058    boolean isWarnEnabled();
059
060    /**
061     * Emits the specified message.
062     *
063     * @param msg The message to log, must not be {@code null}.
064     */
065    void warn(String msg);
066
067    /**
068     * Emits the specified message along with a stack trace of the given exception.
069     *
070     * @param msg The message to log, must not be {@code null}.
071     * @param error The exception to log, may be {@code null}.
072     */
073    void warn(String msg, Throwable error);
074}