/*
* 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.ops;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.testing.ControlsInjector;
/**
* Defines the set of services used by operator implementations. This
* is a subset of the full {@link OperatorContext} which removes global
* services such as network endpoints. Code written to this interface
* can be easily unit tested using the {@link OperatorFixture} class.
* Code that needs global services must be tested in the Drill server
* as a whole, or using mocks for global services.
*/
public interface OperExecContext extends FragmentExecContext {
/**
* Return the physical operator definition created by the planner and passed
* into the Drillbit executing the query.
* @return the physical operator definition
*/
<T extends PhysicalOperator> T getOperatorDefn();
/**
* Return the memory allocator for this operator.
*
* @return the per-operator memory allocator
*/
BufferAllocator getAllocator();
/**
* A write-only interface to the Drill statistics mechanism. Allows
* operators to update statistics.
* @return operator statistics
*/
OperatorStatReceiver getStats();
/**
* Returns the fault injection mechanism used to introduce faults at runtime
* for testing.
* @return the fault injector
*/
ControlsInjector getInjector();
/**
* Insert an unchecked fault (exception). Handles the details of checking if
* fault injection is enabled and this particular fault is selected.
* @param desc the description of the fault used to match a fault
* injection parameter to determine if the fault should be injected
* @throws RuntimeException an unchecked exception if the fault is enabled
*/
void injectUnchecked(String desc);
/**
* Insert a checked fault (exception) of the given class. Handles the details
* of checking if fault injection is enabled and this particular fault is
* selected.
*
* @param desc the description of the fault used to match a fault
* injection parameter to determine if the fault should be injected
* @param exceptionClass the class of exeception to be thrown
* @throws T if the fault is enabled
*/
<T extends Throwable> void injectChecked(String desc, Class<T> exceptionClass)
throws T;
}