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 */ 017package org.apache.logging.log4j.core.async; 018 019import org.apache.logging.log4j.Level; 020 021/** 022 * Default router: enqueue the event for asynchronous logging in the background thread, unless the current thread is the 023 * background thread and the queue is full (enqueueing would cause a deadlock). In that case send the event directly to 024 * the appender (in the current thread). 025 */ 026public class DefaultAsyncQueueFullPolicy implements AsyncQueueFullPolicy { 027 @Override 028 public EventRoute getRoute(final long backgroundThreadId, final Level level) { 029 030 // LOG4J2-471: prevent deadlock when RingBuffer is full and object 031 // being logged calls Logger.log() from its toString() method 032 if (Thread.currentThread().getId() == backgroundThreadId) { 033 return EventRoute.SYNCHRONOUS; 034 } 035 return EventRoute.ENQUEUE; 036 } 037}