content: /**
   * 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.apex.malhar.contrib.ruby;
  
  import java.util.Map;
  
  import org.jruby.embed.LocalVariableBehavior;
  import org.jruby.embed.ScriptingContainer;
  import org.jruby.javasupport.JavaEmbedUtils.EvalUnit;
  
  import org.apache.apex.malhar.lib.script.ScriptOperator;
  
  import com.datatorrent.api.Context.OperatorContext;
  
  /**
   * 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;
      }
    }
  }
  