org.apache.solr.util.stats.InstrumentedPoolingHttpClientConnectionManager.java Source code

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Here is the source code for org.apache.solr.util.stats.InstrumentedPoolingHttpClientConnectionManager.java

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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.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 {

    private SolrMetricManager metricManager;
    private String registryName;

    public InstrumentedPoolingHttpClientConnectionManager(Registry<ConnectionSocketFactory> socketFactoryRegistry) {
        super(socketFactoryRegistry);
    }

    @Override
    public void initializeMetrics(SolrMetricManager manager, String registry, String tag, String scope) {
        this.metricManager = manager;
        this.registryName = registry;
        manager.registerGauge(null, registry, () -> getTotalStats().getAvailable(), tag, true,
                SolrMetricManager.mkName("availableConnections", scope));
        // this acquires a lock on the connection pool; remove if contention sucks
        manager.registerGauge(null, registry, () -> getTotalStats().getLeased(), tag, true,
                SolrMetricManager.mkName("leasedConnections", scope));
        manager.registerGauge(null, registry, () -> getTotalStats().getMax(), tag, true,
                SolrMetricManager.mkName("maxConnections", scope));
        manager.registerGauge(null, registry, () -> getTotalStats().getPending(), tag, true,
                SolrMetricManager.mkName("pendingConnections", scope));
    }
}