Github user jvz commented on a diff in the pull request:
https://github.com/apache/logging-log4j2/pull/74#discussion_r113045904
--- Diff:
log4j-nosql/src/main/java/org/apache/logging/log4j/nosql/appender/lucene/LuceneAppender.java
---
@@ -0,0 +1,301 @@
+/*
+ * 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.nosql.appender.lucene;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.nio.file.Paths;
+import java.util.Calendar;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.logging.log4j.core.Appender;
+import org.apache.logging.log4j.core.Filter;
+import org.apache.logging.log4j.core.Layout;
+import org.apache.logging.log4j.core.LogEvent;
+import org.apache.logging.log4j.core.appender.AbstractAppender;
+import org.apache.logging.log4j.core.appender.AppenderLoggingException;
+import org.apache.logging.log4j.core.config.Node;
+import org.apache.logging.log4j.core.config.plugins.Plugin;
+import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute;
+import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory;
+import org.apache.logging.log4j.core.config.plugins.PluginElement;
+import
org.apache.logging.log4j.core.config.plugins.validation.constraints.Required;
+import org.apache.logging.log4j.util.Strings;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.document.LongField;
+import org.apache.lucene.document.StringField;
+import org.apache.lucene.document.TextField;
+import org.apache.lucene.index.IndexWriter;
+import org.apache.lucene.index.IndexWriterConfig;
+import org.apache.lucene.search.NumericRangeQuery;
+import org.apache.lucene.store.FSDirectory;
+
+/**
+ * This Appender writes logging events to a lucene index library. It takes
a list of
+ * {@link IndexField} with which determines which fields are written to
the index library.
+ * <Lucene name="lucene" ignoreExceptions="true"
target="/target/lucene/index">
+ * <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level
%class{36} %L %M - %msg%xEx%n"/>
+ *
+ * <IndexField name="time" pattern="%d{UNIX_MILLIS}" type="LongField"/>
+ * <IndexField name="level" pattern="%-5level" />
+ * <IndexField name="content" pattern="%d{HH:mm:ss.SSS} %-5level
%class{36} %L %M - %msg%xEx%n"/>
+ * </Lucene>
+ */
+@Plugin(name = "Lucene", category = Node.CATEGORY, elementType =
Appender.ELEMENT_TYPE, printObject = true)
+public class LuceneAppender extends AbstractAppender {
+ /**
+ * index directory
+ */
+ private final String target;
+ /**
+ * Index expiration time (seconds)
+ */
+ private final Integer expiryTime;
+ /**
+ * IndexField array.
+ */
+ private final LuceneIndexField[] indexFields;
+ /**
+ * Periodically clear the index and submit the IndexWriter thread pool
+ */
+ private final ScheduledExecutorService scheduledExecutor =
Executors.newScheduledThreadPool(2);
+ /**
+ * IndexWriter corresponding to each index directory.
+ */
+ private static final ConcurrentHashMap<String, IndexWriter> writerMap =
new ConcurrentHashMap<String, IndexWriter>();
--- End diff --
I can't say that this is enforced everywhere, but the general pattern we
like to follow is that shared state for appenders are handled by a manager
class instead of static fields. Helps with certain deployment scenarios like
WARs, reconfigurations, and multiple appenders using the same config.
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