001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017 018package org.apache.logging.log4j.util; 019 020import org.apache.logging.log4j.message.Message; 021 022/** 023 * Classes implementing this interface know how to supply {@link Message}s. 024 * 025 * <p>This is a <a href="https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html">functional 026 * interface</a> intended to support lambda expressions in log4j 2. 027 * 028 * <p>Implementors are free to cache values or return a new or distinct value each time the supplier is invoked. 029 * 030 * @since 2.4 031 * @deprecated Since 2.6, use {@link Supplier} instead as {@code Supplier<Message>}. 032 */ 033@Deprecated 034public interface MessageSupplier { 035 036 /** 037 * Gets a Message. 038 * 039 * @return a Message 040 */ 041 Message get(); 042}