/**
* 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.store.mock;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.common.expression.ExpressionPosition;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.common.types.TypeProtos.MajorType;
import org.apache.drill.exec.exception.SchemaChangeException;
import org.apache.drill.exec.expr.TypeHelper;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.impl.OutputMutator;
import org.apache.drill.exec.record.MaterializedField;
import org.apache.drill.exec.store.RecordReader;
import org.apache.drill.exec.store.mock.MockGroupScanPOP.MockColumn;
import org.apache.drill.exec.store.mock.MockGroupScanPOP.MockScanEntry;
import org.apache.drill.exec.vector.AllocationHelper;
import org.apache.drill.exec.vector.ValueVector;
public class MockRecordReader implements RecordReader {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MockRecordReader.class);
private OutputMutator output;
private MockScanEntry config;
private FragmentContext context;
private ValueVector[] valueVectors;
private int recordsRead;
private int batchRecordCount;
public MockRecordReader(FragmentContext context, MockScanEntry config) {
this.context = context;
this.config = config;
}
private int getEstimatedRecordSize(MockColumn[] types) {
int x = 0;
for (int i = 0; i < types.length; i++) {
x += TypeHelper.getSize(types[i].getMajorType());
}
return x;
}
private ValueVector getVector(String name, MajorType type, int length) {
assert context != null : "Context shouldn't be null.";
MaterializedField f = MaterializedField.create(new SchemaPath(name, ExpressionPosition.UNKNOWN), type);
ValueVector v;
v = TypeHelper.getNewVector(f, context.getAllocator());
AllocationHelper.allocate(v, length, 50, 4);
return v;
}
@Override
public void setup(OutputMutator output) throws ExecutionSetupException {
try {
this.output = output;
int estimateRowSize = getEstimatedRecordSize(config.getTypes());
valueVectors = new ValueVector[config.getTypes().length];
batchRecordCount = 250000 / estimateRowSize;
for (int i = 0; i < config.getTypes().length; i++) {
valueVectors[i] = getVector(config.getTypes()[i].getName(), config.getTypes()[i].getMajorType(), batchRecordCount);
output.addField(valueVectors[i]);
}
output.setNewSchema();
} catch (SchemaChangeException e) {
throw new ExecutionSetupException("Failure while setting up fields", e);
}
}
@Override
public int next() {
if(recordsRead >= this.config.getRecords()) return 0;
int recordSetSize = Math.min(batchRecordCount, this.config.getRecords() - recordsRead);
recordsRead += recordSetSize;
for(ValueVector v : valueVectors){
AllocationHelper.allocate(v, recordSetSize, 50, 5);
// logger.debug(String.format("MockRecordReader: Generating %d records of random data for VV of type %s.", recordSetSize, v.getClass().getName()));
ValueVector.Mutator m = v.getMutator();
m.setValueCount(recordSetSize);
m.generateTestData();
}
return recordSetSize;
}
@Override
public void cleanup() {
for (int i = 0; i < valueVectors.length; i++) {
try {
output.removeField(valueVectors[i].getField());
} catch (SchemaChangeException e) {
logger.warn("Failure while trying to remove field.", e);
}
valueVectors[i].close();
}
}
}