Package org.apache.drill.exec.physical.impl

Source Code of org.apache.drill.exec.physical.impl.WireRecordBatch

/**
* 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.drill.exec.physical.impl;

import java.util.Iterator;

import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.proto.UserBitShared.RecordBatchDef;
import org.apache.drill.exec.record.BatchSchema;
import org.apache.drill.exec.record.RawFragmentBatch;
import org.apache.drill.exec.record.RawFragmentBatchProvider;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.record.RecordBatchLoader;
import org.apache.drill.exec.record.TypedFieldId;
import org.apache.drill.exec.record.VectorWrapper;
import org.apache.drill.exec.record.WritableBatch;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.drill.exec.record.selection.SelectionVector4;
import org.apache.drill.exec.vector.ValueVector;

public class WireRecordBatch implements RecordBatch{
  static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(WireRecordBatch.class);

  private RecordBatchLoader batchLoader;
  private RawFragmentBatchProvider fragProvider;
  private FragmentContext context;
  private BatchSchema schema;

 
  public WireRecordBatch(FragmentContext context, RawFragmentBatchProvider fragProvider) {
    this.fragProvider = fragProvider;
    this.context = context;
    this.batchLoader = new RecordBatchLoader(context.getAllocator());
  }

  @Override
  public FragmentContext getContext() {
    return context;
  }

  @Override
  public BatchSchema getSchema() {
    return schema;
  }

  @Override
  public int getRecordCount() {
    return batchLoader.getRecordCount();
  }

  @Override
  public void kill() {
    fragProvider.kill(context);
  }
 
  @Override
  public Iterator<VectorWrapper<?>> iterator() {
    return batchLoader.iterator();
  }

  @Override
  public SelectionVector2 getSelectionVector2() {
    throw new UnsupportedOperationException();
  }

  @Override
  public SelectionVector4 getSelectionVector4() {
    throw new UnsupportedOperationException();
  }

  @Override
  public TypedFieldId getValueVectorId(SchemaPath path) {
    return batchLoader.getValueVectorId(path);
  }
 
  @Override
  public VectorWrapper<?> getValueAccessorById(int fieldId, Class<?> clazz) {
    return batchLoader.getValueAccessorById(fieldId, clazz);
  }

  @Override
  public IterOutcome next() {
    RawFragmentBatch batch = fragProvider.getNext();
    try{
      if (batch == null) return IterOutcome.NONE;

      logger.debug("Next received batch {}", batch);

      RecordBatchDef rbd = batch.getHeader().getDef();
      boolean schemaChanged = batchLoader.load(rbd, batch.getBody());
      batch.release();
      if(schemaChanged){
        this.schema = batchLoader.getSchema();
        return IterOutcome.OK_NEW_SCHEMA;
      }else{
        return IterOutcome.OK;
      }
    }catch(SchemaChangeException ex){
      context.fail(ex);
      return IterOutcome.STOP;
    }
  }

  @Override
  public WritableBatch getWritableBatch() {
    return batchLoader.getWritableBatch();
  }
 
 
}
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