1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache license, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the license for the specific language governing permissions and 15 * limitations under the license. 16 */ 17 package org.apache.logging.log4j.core.async; 18 19 import org.apache.logging.log4j.Level; 20 21 /** 22 * Default router: enqueue the event for asynchronous logging in the background thread, unless the current thread is the 23 * background thread and the queue is full (enqueueing would cause a deadlock). In that case send the event directly to 24 * the appender (in the current thread). 25 */ 26 public class DefaultAsyncQueueFullPolicy implements AsyncQueueFullPolicy { 27 @Override 28 public EventRoute getRoute(final long backgroundThreadId, final Level level) { 29 30 // LOG4J2-471: prevent deadlock when RingBuffer is full and object 31 // being logged calls Logger.log() from its toString() method 32 if (Thread.currentThread().getId() == backgroundThreadId) { 33 return EventRoute.SYNCHRONOUS; 34 } 35 return EventRoute.ENQUEUE; 36 } 37 }