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.asterix.runtime.evaluators.functions;
  
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  public class SleepDescriptor extends AbstractScalarFunctionDynamicDescriptor {
  
      private static final long serialVersionUID = 1L;
  
      private static final Logger LOGGER = LogManager.getLogger();
  
      public static final IFunctionDescriptorFactory FACTORY = SleepDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
                  return new IScalarEvaluator() {
  
                      private IPointable argTime = new VoidPointable();
                      private final IScalarEvaluator evalValue = args[0].createScalarEvaluator(ctx);
                      private final IScalarEvaluator evalTime = args[1].createScalarEvaluator(ctx);
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          evalTime.evaluate(tuple, argTime);
  
                          final byte[] bytes = argTime.getByteArray();
                          final int offset = argTime.getStartOffset();
                          final long time = ATypeHierarchy.getLongValue(getIdentifier().getName(), 1, bytes, offset);
  
                          try {
                              if (LOGGER.isTraceEnabled()) {
                                  LOGGER.log(Level.TRACE,
                                          ctx.getTaskContext().getTaskAttemptId() + " sleeping for " + time + " ms");
                              }
                              Thread.sleep(time);
                          } catch (InterruptedException e) {
                              Thread.currentThread().interrupt();
                          } finally {
                              if (LOGGER.isTraceEnabled()) {
                                  LOGGER.log(Level.TRACE,
                                          ctx.getTaskContext().getTaskAttemptId() + " done sleeping for " + time + " ms");
                              }
                          }
  
                          evalValue.evaluate(tuple, result);
                      }
                  };
              }
          };
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.SLEEP;
      }
  
  }
  