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.bookkeeper.metadata.etcd;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  import io.etcd.jetcd.Client;
  import java.io.IOException;
  import org.apache.bookkeeper.common.net.ServiceURI;
  import org.apache.bookkeeper.conf.AbstractConfiguration;
  import org.apache.bookkeeper.meta.LayoutManager;
  import org.apache.bookkeeper.meta.LedgerAuditorManager;
  import org.apache.bookkeeper.meta.LedgerIdGenerator;
  import org.apache.bookkeeper.meta.LedgerManager;
  import org.apache.bookkeeper.meta.LedgerManagerFactory;
  import org.apache.bookkeeper.meta.LedgerUnderreplicationManager;
  import org.apache.bookkeeper.replication.ReplicationException;
  import org.apache.bookkeeper.replication.ReplicationException.CompatibilityException;
  import org.apache.commons.configuration2.ex.ConfigurationException;
  import org.apache.zookeeper.KeeperException;
  
  /**
   * Etcd based ledger manager factory.
   */
  class EtcdLedgerManagerFactory implements LedgerManagerFactory {
  
      static final int VERSION = 0;
  
      private String scope;
      private Client client;
  
      @Override
      public int getCurrentVersion() {
          return VERSION;
      }
  
      @Override
      public LedgerManagerFactory initialize(AbstractConfiguration conf,
                                             LayoutManager layoutManager,
                                             int factoryVersion) throws IOException {
          checkArgument(layoutManager instanceof EtcdLayoutManager);
  
          EtcdLayoutManager etcdLayoutManager = (EtcdLayoutManager) layoutManager;
  
          if (VERSION != factoryVersion) {
              throw new IOException("Incompatible layout version found : " + factoryVersion);
          }
          try {
              ServiceURI uri = ServiceURI.create(conf.getMetadataServiceUri());
              this.scope = uri.getServicePath();
          } catch (ConfigurationException e) {
              throw new IOException("Invalid metadata service uri", e);
          }
          this.client = etcdLayoutManager.getClient();
          return this;
      }
  
      @Override
      public void close() {
          // since layout manager is passed from outside.
          // we don't need to close it here
      }
  
      @Override
      public LedgerIdGenerator newLedgerIdGenerator() {
          return new Etcd64bitIdGenerator(client.getKVClient(), scope);
      }
  
      @Override
      public LedgerManager newLedgerManager() {
          return new EtcdLedgerManager(client, scope);
      }
  
      @Override
      public LedgerUnderreplicationManager newLedgerUnderreplicationManager()
          throws ReplicationException.UnavailableException, InterruptedException, CompatibilityException {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public LedgerAuditorManager newLedgerAuditorManager() throws IOException, InterruptedException {
          throw new UnsupportedOperationException();
      }
  
      @Override
      public void format(AbstractConfiguration<?> conf, LayoutManager lm)
          throws InterruptedException, KeeperException, IOException {
          try {
              EtcdRegistrationManager.format(client.getKVClient(), scope);
          } catch (Exception e) {
              if (e instanceof IOException) {
                  throw (IOException) e;
              } else {
                  throw new IOException(e);
              }
          }
      }
  
      @Override
      public boolean validateAndNukeExistingCluster(AbstractConfiguration<?> conf, LayoutManager lm)
          throws InterruptedException, KeeperException, IOException {
          try {
              return EtcdRegistrationManager.nukeExistingCluster(client.getKVClient(), scope);
          } catch (Exception e) {
              if (e instanceof IOException) {
                  throw (IOException) e;
              } else {
                  throw new IOException(e);
              }
          }
      }
  }
  