| 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; |
| } |
| |
| } |