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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.engine;
import org.apache.lucene.index.SegmentInfos;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.common.lucene.Lucene;
import org.elasticsearch.xcontent.ToXContentFragment;
import org.elasticsearch.xcontent.XContentBuilder;
import java.io.IOException;
import java.util.Base64;
import java.util.Map;
import java.util.Objects;
/** a class the returns dynamic information with respect to the last commit point of this shard */
public final class CommitStats implements Writeable, ToXContentFragment {
private final Map userData;
private final long generation;
private final String id; // lucene commit id in base 64;
private final int numDocs;
public CommitStats(SegmentInfos segmentInfos) {
// clone the map to protect against concurrent changes
userData = Map.copyOf(segmentInfos.getUserData());
// lucene calls the current generation, last generation.
generation = segmentInfos.getLastGeneration();
id = Base64.getEncoder().encodeToString(segmentInfos.getId());
numDocs = Lucene.getNumDocs(segmentInfos);
}
CommitStats(StreamInput in) throws IOException {
userData = in.readImmutableMap(StreamInput::readString, StreamInput::readString);
generation = in.readLong();
id = in.readOptionalString();
numDocs = in.readInt();
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CommitStats that = (CommitStats) o;
return userData.equals(that.userData) && generation == that.generation && Objects.equals(id, that.id) && numDocs == that.numDocs;
}
@Override
public int hashCode() {
return Objects.hash(userData, generation, id, numDocs);
}
public static CommitStats readOptionalCommitStatsFrom(StreamInput in) throws IOException {
return in.readOptionalWriteable(CommitStats::new);
}
public Map getUserData() {
return userData;
}
public long getGeneration() {
return generation;
}
/** base64 version of the commit id (see {@link SegmentInfos#getId()} */
public String getId() {
return id;
}
/**
* Returns the number of documents in the in this commit
*/
public int getNumDocs() {
return numDocs;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeMap(userData, StreamOutput::writeString, StreamOutput::writeString);
out.writeLong(generation);
out.writeOptionalString(id);
out.writeInt(numDocs);
}
static final class Fields {
static final String GENERATION = "generation";
static final String USER_DATA = "user_data";
static final String ID = "id";
static final String COMMIT = "commit";
static final String NUM_DOCS = "num_docs";
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject(Fields.COMMIT);
builder.field(Fields.ID, id);
builder.field(Fields.GENERATION, generation);
builder.field(Fields.USER_DATA, userData);
builder.field(Fields.NUM_DOCS, numDocs);
builder.endObject();
return builder;
}
}