org.elasticsearch.common.logging.NodeAndClusterIdConverter Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.logging;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.pattern.ConverterKeys;
import org.apache.logging.log4j.core.pattern.LogEventPatternConverter;
import org.apache.logging.log4j.core.pattern.PatternConverter;
import org.apache.lucene.util.SetOnce;
import java.util.Locale;
/**
* Pattern converter to format the node_and_cluster_id variable into JSON fields node.id
and cluster.uuid
.
* Keeping those two fields together assures that they will be atomically set and become visible in logs at the same time.
*/
@Plugin(category = PatternConverter.CATEGORY, name = "NodeAndClusterIdConverter")
@ConverterKeys({"node_and_cluster_id"})
public final class NodeAndClusterIdConverter extends LogEventPatternConverter {
private static final SetOnce nodeAndClusterId = new SetOnce<>();
/**
* Called by log4j2 to initialize this converter.
*/
public static NodeAndClusterIdConverter newInstance(@SuppressWarnings("unused") final String[] options) {
return new NodeAndClusterIdConverter();
}
public NodeAndClusterIdConverter() {
super("NodeAndClusterId", "node_and_cluster_id");
}
/**
* Updates only once the clusterID and nodeId.
* Subsequent executions will throw {@link org.apache.lucene.util.SetOnce.AlreadySetException}.
*
* @param nodeId a nodeId received from cluster state update
* @param clusterUUID a clusterId received from cluster state update
*/
public static void setNodeIdAndClusterId(String nodeId, String clusterUUID) {
nodeAndClusterId.set(formatIds(clusterUUID, nodeId));
}
/**
* Formats the node.id and cluster.uuid into json fields.
*
* @param event - a log event is ignored in this method as it uses the nodeId and clusterId to format
*/
@Override
public void format(LogEvent event, StringBuilder toAppendTo) {
if (nodeAndClusterId.get() != null) {
toAppendTo.append(nodeAndClusterId.get());
}
// nodeId/clusterUuid not received yet, not appending
}
private static String formatIds(String clusterUUID, String nodeId) {
return String.format(Locale.ROOT, "\"cluster.uuid\": \"%s\", \"node.id\": \"%s\"", clusterUUID, nodeId);
}
}