| /** |
| * 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.storm.streams.processors; |
| |
| import static org.apache.storm.streams.WindowNode.PUNCTUATION; |
| |
| import java.util.Set; |
| import org.apache.storm.shade.com.google.common.collect.Multimap; |
| import org.apache.storm.streams.ProcessorNode; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A context that emits the results to downstream processors which are in the same bolt. |
| */ |
| public class ForwardingProcessorContext implements ProcessorContext { |
| private static final Logger LOG = LoggerFactory.getLogger(ForwardingProcessorContext.class); |
| private final ProcessorNode processorNode; |
| private final Multimap<String, ProcessorNode> streamToChildren; |
| private final Set<String> streams; |
| |
| public ForwardingProcessorContext(ProcessorNode processorNode, Multimap<String, ProcessorNode> streamToChildren) { |
| this.processorNode = processorNode; |
| this.streamToChildren = streamToChildren; |
| this.streams = streamToChildren.keySet(); |
| } |
| |
| @Override |
| public <T> void forward(T input) { |
| if (PUNCTUATION.equals(input)) { |
| finishAllStreams(); |
| } else { |
| executeAllStreams(input); |
| } |
| } |
| |
| @Override |
| public <T> void forward(T input, String stream) { |
| if (PUNCTUATION.equals(input)) { |
| finish(stream); |
| } else { |
| execute(input, stream); |
| } |
| } |
| |
| @Override |
| public boolean isWindowed() { |
| return processorNode.isWindowed(); |
| } |
| |
| @Override |
| public Set<String> getWindowedParentStreams() { |
| return processorNode.getWindowedParentStreams(); |
| } |
| |
| private void finishAllStreams() { |
| for (String stream : streams) { |
| finish(stream); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private <T> void finish(String stream) { |
| for (ProcessorNode node : streamToChildren.get(stream)) { |
| LOG.debug("Punctuating processor: {}", node); |
| Processor<T> processor = (Processor<T>) node.getProcessor(); |
| processor.punctuate(stream); |
| } |
| } |
| |
| private <T> void executeAllStreams(T input) { |
| for (String stream : streams) { |
| execute(input, stream); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private <T> void execute(T input, String stream) { |
| for (ProcessorNode node : streamToChildren.get(stream)) { |
| LOG.debug("Forward input: {} to processor node: {}", input, node); |
| Processor<T> processor = (Processor<T>) node.getProcessor(); |
| processor.execute(input, stream); |
| } |
| } |
| } |