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.tools.cli.commands.autorecovery;
  
  import com.beust.jcommander.Parameter;
  import com.google.common.util.concurrent.UncheckedExecutionException;
  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  import java.util.concurrent.ExecutionException;
  import lombok.Setter;
  import lombok.experimental.Accessors;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.meta.LedgerUnderreplicationManager;
  import org.apache.bookkeeper.meta.MetadataDrivers;
  import org.apache.bookkeeper.meta.exceptions.MetadataException;
  import org.apache.bookkeeper.replication.ReplicationException;
  import org.apache.bookkeeper.tools.cli.helpers.BookieCommand;
  import org.apache.bookkeeper.tools.framework.CliFlags;
  import org.apache.bookkeeper.tools.framework.CliSpec;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Command to enable or disable auto recovery in the cluster.
   */
  @SuppressFBWarnings("RCN_REDUNDANT_NULLCHECK_WOULD_HAVE_BEEN_A_NPE")
  public class ToggleCommand extends BookieCommand<ToggleCommand.AutoRecoveryFlags> {
  
      static final Logger LOG = LoggerFactory.getLogger(ToggleCommand.class);
  
      private static final String NAME = "toggle";
      private static final String DESC = "Enable or disable auto recovery in the cluster. Default is disable.";
  
      public ToggleCommand() {
          this(new AutoRecoveryFlags());
      }
  
      private ToggleCommand(AutoRecoveryFlags flags) {
          super(CliSpec.<ToggleCommand.AutoRecoveryFlags>newBuilder()
              .withName(NAME).withDescription(DESC)
              .withFlags(flags).build());
      }
  
      /**
       * Flags for auto recovery command.
       */
      @Accessors(fluent = true)
      @Setter
      public static class AutoRecoveryFlags extends CliFlags {
  
          @Parameter(names = { "-e", "--enable" }, description = "Enable or disable auto recovery of under replicated "
                                                                 + "ledgers.")
          private boolean enable;
  
          @Parameter(names = {"-s", "--status"}, description = "Check the auto recovery status.")
          private boolean status;
  
      }
  
      @Override
      public boolean apply(ServerConfiguration conf, AutoRecoveryFlags cmdFlags) {
          try {
              return handler(conf, cmdFlags);
          } catch (MetadataException | ExecutionException e) {
              throw new UncheckedExecutionException(e.getMessage(), e);
          }
      }
  
      private boolean handler(ServerConfiguration conf, AutoRecoveryFlags flags)
          throws MetadataException, ExecutionException {
          MetadataDrivers.runFunctionWithLedgerManagerFactory(conf, mFactory -> {
              try {
                  try (LedgerUnderreplicationManager underreplicationManager = mFactory
                           .newLedgerUnderreplicationManager()) {
                      if (flags.status) {
                          LOG.info("Autorecovery is {}", (underreplicationManager.isLedgerReplicationEnabled()
                                                                       ? "enabled." : "disabled."));
                          return null;
                      }
                      if (flags.enable) {
                          if (underreplicationManager.isLedgerReplicationEnabled()) {
                              LOG.warn("Autorecovery already enabled. Doing nothing");
                          } else {
                              LOG.info("Enabling autorecovery");
                              underreplicationManager.enableLedgerReplication();
                          }
                      } else {
                          if (!underreplicationManager.isLedgerReplicationEnabled()) {
                              LOG.warn("Autorecovery already disabled. Doing nothing");
                          } else {
                              LOG.info("Disabling autorecovery");
                              underreplicationManager.disableLedgerReplication();
                          }
                      }
                  }
              } catch (InterruptedException e) {
                  Thread.currentThread().interrupt();
                  throw new UncheckedExecutionException(e);
              } catch (ReplicationException e) {
                  throw new UncheckedExecutionException(e);
              }
              return null;
          });
          return true;
      }
  }
  