| /** |
| * 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.contrib.ruby; |
| |
| import java.util.Map; |
| |
| import org.jruby.embed.LocalVariableBehavior; |
| import org.jruby.embed.ScriptingContainer; |
| import org.jruby.javasupport.JavaEmbedUtils.EvalUnit; |
| |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.lib.script.ScriptOperator; |
| |
| /** |
| * An implementation of ScriptOperator that executes ruby script on tuples |
| * <p> |
| * |
| * WARNING: EXPERIMENTAL USE ONLY! This operator depends on jruby which has |
| * a transitive dependency on an incompatible version of ASM that breaks |
| * webservice in stram. |
| * |
| * @displayName Ruby Operator |
| * @category Scripting |
| * @tags script, map, string |
| * @since 1.0.4 |
| */ |
| @org.apache.hadoop.classification.InterfaceStability.Evolving |
| public class RubyOperator extends ScriptOperator { |
| |
| public enum Type |
| { |
| EVAL, INVOKE |
| }; |
| |
| protected Type type = Type.EVAL; |
| protected transient Object evalResult; |
| private transient ScriptingContainer sc = null; |
| private transient EvalUnit unit; |
| |
| |
| public void setEval(String script) { |
| |
| this.type = Type.EVAL; |
| this.script = script; |
| } |
| |
| public void setInvoke(String functionName) { |
| |
| this.type = Type.INVOKE; |
| this.script = functionName; |
| } |
| |
| @Override |
| public void setup(OperatorContext context) { |
| |
| sc = new ScriptingContainer(LocalVariableBehavior.PERSISTENT); |
| for (String s : setupScripts) { |
| EvalUnit unit = sc.parse(s); |
| unit.run(); |
| } |
| if (type == Type.EVAL) { |
| unit = sc.parse(script); |
| } |
| } |
| |
| @Override |
| public void process(Map<String, Object> tuple) { |
| |
| try { |
| if(type == Type.EVAL) { |
| for (Map.Entry<String, Object> entry : tuple.entrySet()) { |
| sc.put(entry.getKey(), entry.getValue()); |
| } |
| evalResult = unit.run(); |
| } |
| else { |
| Object[] args = new Object[tuple.size()]; |
| int index = 0; |
| for (Map.Entry<String, Object> entry : tuple.entrySet()) { |
| args[index++] = entry.getValue(); |
| } |
| evalResult = sc.callMethod(evalResult, script, args); |
| } |
| if (isPassThru && result.isConnected()) { |
| result.emit(evalResult); |
| } |
| if (isPassThru && outBindings.isConnected()) { |
| outBindings.emit(getBindings()); |
| } |
| sc.clear(); |
| } |
| catch (Exception ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| @Override |
| public void endWindow() { |
| |
| if (!isPassThru) { |
| if(result.isConnected()) |
| result.emit(evalResult); |
| if(outBindings.isConnected()) |
| outBindings.emit(getBindings()); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public Map<String, Object> getBindings() { |
| |
| if(sc == null) |
| return null; |
| if(sc.getVarMap() != null) { |
| return sc.getVarMap().getMap(); |
| } |
| else |
| return null; |
| } |
| } |