/**
* 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.List;
import java.util.concurrent.TimeUnit;
import com.google.common.base.Stopwatch;
import org.apache.drill.common.exceptions.ExecutionSetupException;
import org.apache.drill.exec.ops.FragmentContext;
import org.apache.drill.exec.physical.base.AbstractPhysicalVisitor;
import org.apache.drill.exec.physical.base.FragmentRoot;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.physical.impl.validate.IteratorValidatorInjector;
import org.apache.drill.exec.record.RecordBatch;
import org.apache.drill.exec.util.AssertionUtil;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
/**
* Implementation of the physical operator visitor
*/
public class ImplCreator extends AbstractPhysicalVisitor<RecordBatch, FragmentContext, ExecutionSetupException> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ImplCreator.class);
private RootExec root = null;
private ImplCreator(){}
private RootExec getRoot(){
return root;
}
@Override
@SuppressWarnings("unchecked")
public RecordBatch visitOp(PhysicalOperator op, FragmentContext context) throws ExecutionSetupException {
Preconditions.checkNotNull(op);
Preconditions.checkNotNull(context);
Object opCreator = context.getDrillbitContext().getOperatorCreatorRegistry().getOperatorCreator(op.getClass());
if (opCreator != null) {
if (op instanceof FragmentRoot ) {
root = ((RootCreator<PhysicalOperator>)opCreator).getRoot(context, op, getChildren(op, context));
return null;
} else {
return ((BatchCreator<PhysicalOperator>)opCreator).getBatch(context, op, getChildren(op, context));
}
} else {
throw new UnsupportedOperationException(String.format(
"The PhysicalVisitor of type %s does not currently support visiting the PhysicalOperator type %s.",
this.getClass().getCanonicalName(), op.getClass().getCanonicalName()));
}
}
private List<RecordBatch> getChildren(PhysicalOperator op, FragmentContext context) throws ExecutionSetupException {
List<RecordBatch> children = Lists.newArrayList();
for (PhysicalOperator child : op) {
children.add(child.accept(this, context));
}
return children;
}
public static RootExec getExec(FragmentContext context, FragmentRoot root) throws ExecutionSetupException {
ImplCreator i = new ImplCreator();
if(AssertionUtil.isAssertionsEnabled()){
root = IteratorValidatorInjector.rewritePlanWithIteratorValidator(context, root);
}
Stopwatch watch = new Stopwatch();
watch.start();
root.accept(i, context);
logger.debug("Took {} ms to accept", watch.elapsed(TimeUnit.MILLISECONDS));
if (i.root == null)
throw new ExecutionSetupException(
"The provided fragment did not have a root node that correctly created a RootExec value.");
return i.getRoot();
}
}