| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * 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 from |
| * |
| * 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 edu.uci.ics.pregelix.example.trianglecounting; |
| |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.pregelix.api.graph.GlobalAggregator; |
| import edu.uci.ics.pregelix.api.graph.Vertex; |
| import edu.uci.ics.pregelix.example.io.VLongWritable; |
| |
| /** |
| * The global aggregator aggregates the count of triangles |
| */ |
| public class TriangleCountingAggregator extends |
| GlobalAggregator<VLongWritable, VLongWritable, VLongWritable, VLongWritable, VLongWritable, VLongWritable> { |
| |
| private VLongWritable state = new VLongWritable(0); |
| |
| @Override |
| public void init() { |
| state.set(0); |
| } |
| |
| @Override |
| public void step(Vertex<VLongWritable, VLongWritable, VLongWritable, VLongWritable> v) throws HyracksDataException { |
| state.set(state.get() + v.getVertexValue().get()); |
| } |
| |
| @Override |
| public void step(VLongWritable partialResult) { |
| state.set(state.get() + partialResult.get()); |
| } |
| |
| @Override |
| public VLongWritable finishPartial() { |
| return state; |
| } |
| |
| @Override |
| public VLongWritable finishFinal() { |
| return state; |
| } |
| |
| } |