/*
* 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.pig;
/**
* This is an interface which, if implemented, allows an Accumulator
* function to signal that it can terminate early. Certain classes of
* UDF to do not need access to an entire set of data in order to
* finish processing. A model example is {org.apache.pig.builtin.IsEmpty}. IsEmpty
* can be Accumulative as if it receives even one line, it knows that
* it is not empty. Another example might be a UDF which does streaming
* analysis, and once a given stream matches a criteria, can terminate
* without needing any further analysis.
*/
public interface TerminatingAccumulator<T> extends Accumulator<T> {
public boolean isFinished();
}