Example of a BasicAuthSolrClientCache

BasicAuthSolrClientCache.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
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package org.apache.solr.client.solrj.io;

import java.io.IOException;
import java.lang.invoke.MethodHandles;
import java.util.Map;
import java.util.HashMap;

import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.HttpClient;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.impl.CloudSolrClient;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *  The BasicAuthSolrClientCache extends the regular SolrClientCache to allow for Basic Authentication
 **/
public class BasicAuthSolrClientCache extends SolrClientCache {

  private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  private final Map<String, SolrClient> solrClients = new HashMap<>();
  private final String username;
  private final String password;

  public BasicAuthSolrClientCache(String username, String password) {
    this.username = username;
    this.password = password;
  }

  @Override
  public synchronized CloudSolrClient getCloudSolrClient(String zkHost) {
    CloudSolrClient client;
    if (solrClients.containsKey(zkHost)) {
      client = (CloudSolrClient) solrClients.get(zkHost);
    } else {
      client = new CloudSolrClient.Builder()
          .withZkHost(zkHost)
          .withHttpClient(getHttpClient())
          .build();
      client.connect();
      solrClients.put(zkHost, client);
    }

    return client;
  }

  @Override
  public synchronized HttpSolrClient getHttpSolrClient(String host) {
    HttpSolrClient client;
    if (solrClients.containsKey(host)) {
      client = (HttpSolrClient) solrClients.get(host);
    } else {
      client = new HttpSolrClient.Builder(host)
          .withHttpClient(getHttpClient())
          .build();
      solrClients.put(host, client);
    }
    return client;
  }

  @Override
  public synchronized void close() {
    for(Map.Entry<String, SolrClient> entry : solrClients.entrySet()) {
      try {
        entry.getValue().close();
      } catch (IOException e) {
        log.error("Error closing SolrClient for " + entry.getKey(), e);
      }
    }
    solrClients.clear();
  }

  private HttpClient getHttpClient() {
    CredentialsProvider provider = new BasicCredentialsProvider();
    UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(this.username, this.password);
    provider.setCredentials(AuthScope.ANY, credentials);
    return HttpClientBuilder.create().setDefaultCredentialsProvider(provider).build();
  }
}