EstimateProvider.java

/***********************************************************************************************************************
 * Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
 *
 * Licensed 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 eu.stratosphere.compiler.dag;


public interface EstimateProvider {
	
	/**
	 * Gets the estimated output size from this node.
	 * 
	 * @return The estimated output size.
	 */
	long getEstimatedOutputSize();

	/**
	 * Gets the estimated number of records in the output of this node.
	 * 
	 * @return The estimated number of records.
	 */
	long getEstimatedNumRecords();
	
	/**
	 * Gets the estimated number of bytes per record.
	 * 
	 * @return The estimated number of bytes per record.
	 */
	float getEstimatedAvgWidthPerOutputRecord();
}