| /** |
| * 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 com.datatorrent.samples.lib.math; |
| |
| import com.datatorrent.api.StreamingApplication; |
| import com.datatorrent.api.DAG; |
| import com.datatorrent.lib.io.*; |
| import com.datatorrent.lib.script.JavaScriptOperator; |
| import org.apache.hadoop.conf.Configuration; |
| |
| /** |
| * This sample application code for showing sample usage of malhar operator(s). <br> |
| * <b>Operator : </b> Script <br> |
| * <bClass : </b> com.datatorrent.lib.math.Script |
| * Java script returns square of variable 'val'. |
| * |
| * @since 0.3.2 |
| */ |
| public class ScriptSample implements StreamingApplication |
| { |
| @Override |
| public void populateDAG(DAG dag, Configuration conf) |
| { |
| // Create application dag. |
| dag.setAttribute(DAG.APPLICATION_NAME, "MobileDevApplication"); |
| dag.setAttribute(DAG.DEBUG, true); |
| |
| // Add random integer generator operator |
| SingleKeyValMap rand = dag.addOperator("rand", SingleKeyValMap.class); |
| |
| JavaScriptOperator script = dag.addOperator("script", JavaScriptOperator.class); |
| //script.setEval("val = val*val;"); |
| script.addSetupScript("function square() { return val*val;}"); |
| script.setInvoke("square"); |
| dag.addStream("evalstream", rand.outport, script.inBindings); |
| |
| // Connect to output console operator |
| ConsoleOutputOperator console = dag.addOperator("console", new ConsoleOutputOperator()); |
| dag.addStream("rand_console",script.result , console.input); |
| |
| // done |
| } |
| |
| |
| } |