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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.env;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.gateway.MetaDataStateFormat;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Objects;
/**
* Metadata associated with this node. Currently only contains the unique uuid describing this node.
* The metadata is persisted in the data folder of this node and is reused across restarts.
*/
public final class NodeMetaData {
private static final String NODE_ID_KEY = "node_id";
private final String nodeId;
public NodeMetaData(final String nodeId) {
this.nodeId = Objects.requireNonNull(nodeId);
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
NodeMetaData that = (NodeMetaData) o;
return Objects.equals(this.nodeId, that.nodeId);
}
@Override
public int hashCode() {
return this.nodeId.hashCode();
}
@Override
public String toString() {
return "node_id [" + nodeId + "]";
}
private static ObjectParser PARSER = new ObjectParser<>("node_meta_data", Builder::new);
static {
PARSER.declareString(Builder::setNodeId, new ParseField(NODE_ID_KEY));
}
public String nodeId() {
return nodeId;
}
private static class Builder {
String nodeId;
public void setNodeId(String nodeId) {
this.nodeId = nodeId;
}
public NodeMetaData build() {
return new NodeMetaData(nodeId);
}
}
public static final MetaDataStateFormat FORMAT = new MetaDataStateFormat(XContentType.SMILE, "node-") {
@Override
protected XContentBuilder newXContentBuilder(XContentType type, OutputStream stream) throws IOException {
XContentBuilder xContentBuilder = super.newXContentBuilder(type, stream);
xContentBuilder.prettyPrint();
return xContentBuilder;
}
@Override
public void toXContent(XContentBuilder builder, NodeMetaData nodeMetaData) throws IOException {
builder.field(NODE_ID_KEY, nodeMetaData.nodeId);
}
@Override
public NodeMetaData fromXContent(XContentParser parser) throws IOException {
return PARSER.apply(parser, null).build();
}
};
}