/*
* 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.util.stats;
import org.apache.http.config.Registry;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.solr.metrics.SolrMetricManager;
import org.apache.solr.metrics.SolrMetricProducer;
/**
* Sub-class of PoolingHttpClientConnectionManager which tracks metrics interesting to Solr.
* Inspired by dropwizard metrics-httpclient library implementation.
*/
public class InstrumentedPoolingHttpClientConnectionManager extends PoolingHttpClientConnectionManager implements SolrMetricProducer {
public InstrumentedPoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry) {
super(socketFactoryRegistry);
}
@Override
public void initializeMetrics(SolrMetricManager manager, String registry, String scope) {
manager.registerGauge(null, registry, () -> getTotalStats().getAvailable(), true, SolrMetricManager.mkName("availableConnections", scope));
// this acquires a lock on the connection pool; remove if contention sucks
manager.registerGauge(null, registry, () -> getTotalStats().getLeased(), true, SolrMetricManager.mkName("leasedConnections", scope));
manager.registerGauge(null, registry, () -> getTotalStats().getMax(), true, SolrMetricManager.mkName("maxConnections", scope));
manager.registerGauge(null, registry, () -> getTotalStats().getPending(), true, SolrMetricManager.mkName("pendingConnections", scope));
}
}