/*
    * 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.shardingsphere.proxy.backend.mysql.handler.admin.executor;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.infra.exception.core.ShardingSpherePreconditions;
  import org.apache.shardingsphere.infra.exception.generic.UnsupportedSQLOperationException;
  import org.apache.shardingsphere.proxy.backend.context.ProxyContext;
  import org.apache.shardingsphere.proxy.backend.handler.admin.executor.DatabaseAdminExecutor;
  import org.apache.shardingsphere.proxy.backend.session.ConnectionSession;
  import org.apache.shardingsphere.sql.parser.statement.mysql.dal.MySQLKillStatement;
  
  import java.sql.SQLException;
  
  /**
   * Kill process executor.
   */
  @RequiredArgsConstructor
  public final class KillProcessExecutor implements DatabaseAdminExecutor {
      
      private static final String QUERY_SCOPE = "QUERY";
      
      private final MySQLKillStatement killStatement;
      
      /**
       * Execute.
       *
       * @param connectionSession connection session
       */
      @Override
      public void execute(final ConnectionSession connectionSession) throws SQLException {
          ShardingSpherePreconditions.checkState(QUERY_SCOPE.equalsIgnoreCase(killStatement.getScope()),
                  () -> new UnsupportedSQLOperationException("Only `KILL QUERY <processId>` SQL syntax is supported"));
          String processId = killStatement.getProcessId();
          ProxyContext.getInstance().getContextManager().getPersistServiceFacade().getModeFacade().getProcessService().killProcess(processId);
      }
  }