content: /*
   * 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.kafka.connect.runtime;
  
  import org.apache.kafka.connect.connector.Connector;
  import org.apache.kafka.connect.errors.ConnectException;
  import org.apache.kafka.connect.runtime.isolation.Plugins;
  import org.apache.kafka.connect.runtime.isolation.VersionedPluginLoadingException;
  
  import org.apache.maven.artifact.versioning.VersionRange;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class CachedConnectors {
  
      private static final String LATEST_VERSION = "latest";
  
      private final Map<String, Map<String, Connector>> connectors;
      private final Map<String, Throwable> invalidConnectors;
      private final Map<String, Map<String, VersionedPluginLoadingException>> invalidVersions;
      private final Plugins plugins;
  
      public CachedConnectors(Plugins plugins) {
          this.plugins = plugins;
          this.connectors = new ConcurrentHashMap<>();
          this.invalidConnectors = new ConcurrentHashMap<>();
          this.invalidVersions = new ConcurrentHashMap<>();
      }
  
      private void validate(String connectorName, VersionRange range) throws ConnectException, VersionedPluginLoadingException {
          if (invalidConnectors.containsKey(connectorName)) {
              throw new ConnectException(invalidConnectors.get(connectorName));
          }
  
          String version = range == null ? LATEST_VERSION : range.toString();
          if (invalidVersions.containsKey(connectorName) && invalidVersions.get(connectorName).containsKey(version)) {
              throw new VersionedPluginLoadingException(invalidVersions.get(connectorName).get(version).getMessage());
          }
      }
  
      private Connector lookup(String connectorName, VersionRange range) {
          String version = range == null ? LATEST_VERSION : range.toString();
          if (connectors.containsKey(connectorName) && connectors.get(connectorName).containsKey(version)) {
              return connectors.get(connectorName).get(version);
          }
  
          try {
              Connector connector = plugins.newConnector(connectorName, range);
              connectors.computeIfAbsent(connectorName, k -> new ConcurrentHashMap<>()).put(version, connector);
              return connector;
          } catch (VersionedPluginLoadingException e) {
              invalidVersions.computeIfAbsent(connectorName, k -> new ConcurrentHashMap<>()).put(version, e);
              throw e;
          } catch (Exception e) {
              invalidConnectors.put(connectorName, e);
              throw e;
          }
      }
  
      public Connector getConnector(String connectorName, VersionRange range) {
          validate(connectorName, range);
          return lookup(connectorName, range);
      }
  }
  