| /* |
| * To change this template, choose Tools | Templates |
| * and open the template in the editor. |
| */ |
| package com.yahoo.labs.samoa.topology.impl; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2013 Yahoo! Inc. |
| * %% |
| * 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. |
| * #L% |
| */ |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.commons.lang3.builder.HashCodeBuilder; |
| import com.yahoo.labs.samoa.core.ContentEvent; |
| import com.yahoo.labs.samoa.topology.AbstractStream; |
| import com.yahoo.labs.samoa.topology.IProcessingItem; |
| import com.yahoo.labs.samoa.utils.StreamDestination; |
| |
| /** |
| * |
| * @author abifet |
| */ |
| class SimpleStream extends AbstractStream { |
| private List<StreamDestination> destinations; |
| private int maxCounter; |
| private int eventCounter; |
| |
| SimpleStream(IProcessingItem sourcePi) { |
| super(sourcePi); |
| this.destinations = new LinkedList<>(); |
| this.eventCounter = 0; |
| this.maxCounter = 1; |
| } |
| |
| private int getNextCounter() { |
| if (maxCounter > 0 && eventCounter >= maxCounter) |
| eventCounter = 0; |
| this.eventCounter++; |
| return this.eventCounter; |
| } |
| |
| @Override |
| public void put(ContentEvent event) { |
| this.put(event, this.getNextCounter()); |
| } |
| |
| private void put(ContentEvent event, int counter) { |
| SimpleProcessingItem pi; |
| int parallelism; |
| for (StreamDestination destination : destinations) { |
| pi = (SimpleProcessingItem) destination.getProcessingItem(); |
| parallelism = destination.getParallelism(); |
| switch (destination.getPartitioningScheme()) { |
| case SHUFFLE: |
| pi.processEvent(event, counter % parallelism); |
| break; |
| case GROUP_BY_KEY: |
| HashCodeBuilder hb = new HashCodeBuilder(); |
| hb.append(event.getKey()); |
| int key = hb.build() % parallelism; |
| pi.processEvent(event, key); |
| break; |
| case BROADCAST: |
| for (int p = 0; p < parallelism; p++) { |
| pi.processEvent(event, p); |
| } |
| break; |
| } |
| } |
| } |
| |
| public void addDestination(StreamDestination destination) { |
| this.destinations.add(destination); |
| if (maxCounter <= 0) |
| maxCounter = 1; |
| maxCounter *= destination.getParallelism(); |
| } |
| } |