| /* |
| * 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(); |
| } |
