/**
* 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 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.config.Trace;
import java.util.List;
import com.google.common.collect.Lists;
public class TraceInjector extends AbstractPhysicalVisitor<PhysicalOperator, FragmentContext, ExecutionSetupException> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(TraceInjector.class);
static int traceTagCount = 0;
RootExec root = null;
private ScreenCreator sc = new ScreenCreator();
public static PhysicalOperator getExec(FragmentContext context, FragmentRoot root) throws ExecutionSetupException {
TraceInjector tI = new TraceInjector();
PhysicalOperator newOp = root.accept(tI, context);
return newOp;
}
/**
* Traverse the physical plan and inject the trace operator after
* every operator.
* @param op Physical operator under which the trace operator will be injected
* @param context Fragment context
* @return same physical operator as passed in, but its child will be a trace operator
* whose child will be the original child of this operator
* @throws ExecutionSetupException
*/
@Override
public PhysicalOperator visitOp(PhysicalOperator op, FragmentContext context) throws ExecutionSetupException{
List<PhysicalOperator> newChildren = Lists.newArrayList();
List<PhysicalOperator> list = null;
PhysicalOperator newOp = op;
/* Get the list of child operators */
for (PhysicalOperator child : op)
{
newChildren.add(child.accept(this, context));
}
list = Lists.newArrayList();
/* For every child operator create a trace operator as its parent */
for (int i = 0; i < newChildren.size(); i++)
{
String traceTag = newChildren.get(i).toString() + Integer.toString(traceTagCount++);
/* Trace operator */
Trace traceOp = new Trace(newChildren.get(i), traceTag);
list.add(traceOp);
}
/* Inject trace operator */
if (list.size() > 0)
newOp = op.getNewWithChildren(list);
newOp.setOperatorId(op.getOperatorId());
return newOp;
}
}