| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.core.pattern; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.plugins.Plugin; |
| import org.apache.logging.log4j.util.PerformanceSensitive; |
| |
| /** |
| * Formats the event sequence number. |
| */ |
| @Plugin(name = "SequenceNumberPatternConverter", category = "Converter") |
| @ConverterKeys({ "sn", "sequenceNumber" }) |
| @PerformanceSensitive("allocation") |
| public final class SequenceNumberPatternConverter extends LogEventPatternConverter { |
| |
| private static final AtomicLong SEQUENCE = new AtomicLong(); |
| |
| /** |
| * Singleton. |
| */ |
| private static final SequenceNumberPatternConverter INSTANCE = |
| new SequenceNumberPatternConverter(); |
| |
| /** |
| * Private constructor. |
| */ |
| private SequenceNumberPatternConverter() { |
| super("Sequence Number", "sn"); |
| } |
| |
| /** |
| * Obtains an instance of SequencePatternConverter. |
| * |
| * @param options options, currently ignored, may be null. |
| * @return instance of SequencePatternConverter. |
| */ |
| public static SequenceNumberPatternConverter newInstance(final String[] options) { |
| return INSTANCE; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void format(final LogEvent event, final StringBuilder toAppendTo) { |
| toAppendTo.append(SEQUENCE.incrementAndGet()); |
| } |
| } |