| package org.apache.samoa.flink.topology.impl; |
| |
| /* |
| * #%L |
| * SAMOA |
| * %% |
| * Copyright (C) 2014 - 2015 Apache Software Foundation |
| * %% |
| * 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 org.apache.flink.streaming.api.datastream.DataStream; |
| import org.apache.samoa.core.ContentEvent; |
| import org.apache.samoa.flink.helpers.Utils; |
| import org.apache.samoa.topology.AbstractStream; |
| |
| import java.io.Serializable; |
| |
| |
| /** |
| * A stream for SAMOA based on Apache Flink's DataStream |
| */ |
| public class FlinkStream extends AbstractStream implements FlinkComponent, Serializable { |
| |
| private static int outputCounter = 0; |
| private FlinkComponent sourceComponent; |
| private transient DataStream<SamoaType> filteredStream; |
| private String filterID; |
| |
| public FlinkStream(FlinkComponent sourcePi) { |
| this.sourceComponent = sourcePi; |
| setStreamId("stream-" + Integer.toString(outputCounter)); |
| filterID = "stream-" + Integer.toString(outputCounter); |
| outputCounter++; |
| } |
| |
| @Override |
| public void initialise() { |
| if (sourceComponent instanceof FlinkProcessingItem) { |
| filteredStream = sourceComponent.getOutStream().filter(Utils.getFilter(getStreamId())) |
| .setParallelism(((FlinkProcessingItem) sourceComponent).getParallelism()); |
| } else |
| filteredStream = sourceComponent.getOutStream(); |
| } |
| |
| @Override |
| public boolean canBeInitialised() { |
| return sourceComponent.isInitialised(); |
| } |
| |
| @Override |
| public boolean isInitialised() { |
| return filteredStream != null; |
| } |
| |
| @Override |
| public DataStream getOutStream() { |
| return filteredStream; |
| } |
| |
| @Override |
| public void put(ContentEvent event) { |
| ((FlinkProcessingItem) sourceComponent).putToStream(event, this); |
| } |
| |
| @Override |
| public int getComponentId() { |
| return -1; //dummy number shows that it comes from a Stream |
| } |
| |
| public int getSourcePiId() { |
| return sourceComponent.getComponentId(); |
| } |
| |
| @Override |
| public String getStreamId() { |
| return filterID; |
| } |
| } |