/**
* 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.hadoop.hive.llap;
/**
* Consumer feedback typically used by Consumer<T>;
* allows consumer to influence production of data.
*/
public interface ConsumerFeedback<T> {
/** Pause data production. */
public void pause();
/** Unpause data production. */
public void unpause();
/** Stop data production, the external operation has been cancelled. */
public void stop();
/** Returns processed data back to producer; necessary if e.g. data is locked in cache. */
public void returnData(T data);
}