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  /*
   * Licensed 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 com.facebook.presto.execution;
 
 
 
 import java.net.URI;
 import java.util.Map;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 
 public class DataDefinitionExecution<T extends Statement>
         implements QueryExecution
 {
     private final DataDefinitionTask<T> task;
     private final T statement;
     private final Session session;
     private final Metadata metadata;
     private final QueryStateMachine stateMachine;
 
     private DataDefinitionExecution(
             DataDefinitionTask<T> task,
             T statement,
             Session session,
             Metadata metadata,
             QueryStateMachine stateMachine)
     {
         this. = checkNotNull(task"task is null");
         this. = checkNotNull(statement"statement is null");
         this. = checkNotNull(session"session is null");
         this. = checkNotNull(metadata"metadata is null");
         this. = checkNotNull(stateMachine"stateMachine is null");
     }
 
     @Override
     public void start()
     {
         try {
             // transition to starting
             if (!.starting()) {
                 // query already started or finished
                 return;
             }
 
             .recordExecutionStart();
 
             .execute();
 
             .finished();
         }
         catch (RuntimeException e) {
             fail(e);
         }
     }
 
     @Override
     public Duration waitForStateChange(QueryState currentStateDuration maxWait)
             throws InterruptedException
     {
         return .waitForStateChange(currentStatemaxWait);
     }
 
     @Override
     public void addStateChangeListener(StateChangeListener<QueryStatestateChangeListener)
     {
         .addStateChangeListener(stateChangeListener);
     }
 
     @Override
     public void fail(Throwable cause)
     {
         .fail(cause);
     }
 
     @Override
     public void cancelStage(StageId stageId)
     {
         // no-op
     }
    @Override
    public void recordHeartbeat()
    {
        .recordHeartbeat();
    }
    @Override
    public QueryInfo getQueryInfo()
    {
        return .getQueryInfoWithoutDetails();
    }
    public static class DataDefinitionExecutionFactory
            implements QueryExecutionFactory<DataDefinitionExecution<?>>
    {
        private final LocationFactory locationFactory;
        private final Metadata metadata;
        private final ExecutorService executor;
        private final Map<Class<? extends Statement>, DataDefinitionTask<?>> tasks;
        @Inject
        public DataDefinitionExecutionFactory(
                LocationFactory locationFactory,
                MetadataManager metadata,
                @ForQueryExecution ExecutorService executor,
                Map<Class<? extends Statement>, DataDefinitionTask<?>> tasks)
        {
            this. = checkNotNull(locationFactory"locationFactory is null");
            this. = checkNotNull(metadata"metadata is null");
            this. = checkNotNull(executor"executor is null");
            this. = checkNotNull(tasks"tasks is null");
        }
        @Override
                QueryId queryId,
                String query,
                Session session,
                Statement statement)
        {
            URI self = .createQueryLocation(queryId);
            QueryStateMachine stateMachine = new QueryStateMachine(queryIdquerysessionself);
            return createExecution(statementsessionstateMachine);
        }
        private <T extends StatementDataDefinitionExecution<?> createExecution(
                T statement,
                Session session,
                QueryStateMachine stateMachine)
        {
            DataDefinitionTask<T> task = getTask(statement);
            checkArgument(task != null"no task for statement: " + statement.getClass());
            return new DataDefinitionExecution<>(taskstatementsessionstateMachine);
        }
        @SuppressWarnings("unchecked")
        private <T extends StatementDataDefinitionTask<T> getTask(T statement)
        {
            return (DataDefinitionTask<T>) .get(statement.getClass());
        }
    }
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