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 com.lmax.disruptor.ExceptionHandler;
020
021/**
022 * Default disruptor exception handler for errors that occur in the AsyncLogger background thread.
023 */
024public class AsyncLoggerConfigDefaultExceptionHandler
025        implements ExceptionHandler<AsyncLoggerConfigDisruptor.Log4jEventWrapper> {
026
027    @Override
028    public void handleEventException(final Throwable throwable, final long sequence,
029            final AsyncLoggerConfigDisruptor.Log4jEventWrapper event) {
030        StringBuilder sb = new StringBuilder(512);
031        sb.append("AsyncLogger error handling event seq=").append(sequence).append(", value='");
032        try {
033            sb.append(event);
034        } catch (Exception ignored) {
035            sb.append("[ERROR calling ").append(event.getClass()).append(".toString(): ");
036            sb.append(ignored).append("]");
037        }
038        sb.append("':");
039        System.err.println(sb);
040        throwable.printStackTrace();
041    }
042
043    @Override
044    public void handleOnStartException(final Throwable throwable) {
045        System.err.println("AsyncLogger error starting:");
046        throwable.printStackTrace();
047    }
048
049    @Override
050    public void handleOnShutdownException(final Throwable throwable) {
051        System.err.println("AsyncLogger error shutting down:");
052        throwable.printStackTrace();
053    }
054}