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/*
* 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.solr.cluster.placement.impl;
import java.lang.invoke.MethodHandles;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Optional;
import org.apache.solr.cluster.placement.CollectionMetrics;
import org.apache.solr.cluster.placement.ReplicaMetric;
import org.apache.solr.cluster.placement.ReplicaMetrics;
import org.apache.solr.cluster.placement.ShardMetrics;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Builder class for constructing instances of {@link CollectionMetrics}. */
public class CollectionMetricsBuilder {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
final Map shardMetricsBuilders = new HashMap<>();
public Map getShardMetricsBuilders() {
return shardMetricsBuilders;
}
public CollectionMetrics build() {
final Map metricsMap = new HashMap<>();
shardMetricsBuilders.forEach((shard, builder) -> metricsMap.put(shard, builder.build()));
return new CollectionMetrics() {
@Override
public Optional getShardMetrics(String shardName) {
return Optional.ofNullable(metricsMap.get(shardName));
}
@Override
public Iterator iterator() {
return metricsMap.values().iterator();
}
};
}
public static class ShardMetricsBuilder {
final Map replicaMetricsBuilders = new HashMap<>();
final String shardName;
ReplicaMetricsBuilder leaderMetricsBuilder;
public ShardMetricsBuilder(String shardName) {
this.shardName = shardName;
}
public Map getReplicaMetricsBuilders() {
return replicaMetricsBuilders;
}
public ShardMetricsBuilder setLeaderMetrics(ReplicaMetricsBuilder replicaMetricsBuilder) {
leaderMetricsBuilder = replicaMetricsBuilder;
if (leaderMetricsBuilder != null) {
replicaMetricsBuilders.put(leaderMetricsBuilder.replicaName, leaderMetricsBuilder);
}
return this;
}
public ShardMetrics build() {
final Map metricsMap = new HashMap<>();
replicaMetricsBuilders.forEach(
(name, replicaBuilder) -> {
ReplicaMetrics metrics = replicaBuilder.build();
metricsMap.put(name, metrics);
if (replicaBuilder.leader) {
if (leaderMetricsBuilder != null
&& !leaderMetricsBuilder.replicaName.equals(replicaBuilder.replicaName)) {
log.warn(
"Multiple replicas claim to be shard leader, selecting the latest candidate ({}) for metrics purposes",
replicaBuilder.replicaName);
}
leaderMetricsBuilder = replicaBuilder;
}
});
final ReplicaMetrics finalLeaderMetrics =
leaderMetricsBuilder != null ? leaderMetricsBuilder.build() : null;
return new ShardMetrics() {
@Override
public String getShardName() {
return shardName;
}
@Override
public Optional getLeaderMetrics() {
return Optional.ofNullable(finalLeaderMetrics);
}
@Override
public Optional getReplicaMetrics(String replicaName) {
return Optional.ofNullable(metricsMap.get(replicaName));
}
@Override
public Iterator iterator() {
return metricsMap.values().iterator();
}
};
}
}
public static class ReplicaMetricsBuilder {
final Map, Object> metrics = new HashMap<>();
final String replicaName;
boolean leader;
public ReplicaMetricsBuilder(String replicaName) {
this.replicaName = replicaName;
}
public ReplicaMetricsBuilder setLeader(boolean leader) {
this.leader = leader;
return this;
}
/**
* Add unconverted (raw) values here, this method internally calls {@link
* ReplicaMetric#convert(Object)}.
*
* @param metric metric to add
* @param value raw (unconverted) metric value
*/
public ReplicaMetricsBuilder addMetric(ReplicaMetric metric, Object value) {
value = metric.convert(value);
if (value != null) {
metrics.put(metric, value);
}
return this;
}
public ReplicaMetrics build() {
return new ReplicaMetrics() {
@Override
public String getReplicaName() {
return replicaName;
}
@Override
@SuppressWarnings("unchecked")
public Optional getReplicaMetric(ReplicaMetric metric) {
return Optional.ofNullable((T) metrics.get(metric));
}
@Override
public Iterator, Object>> iterator() {
return metrics.entrySet().iterator();
}
};
}
}
}