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
   *
   * <p>http://www.apache.org/licenses/LICENSE-2.0
   *
   * <p>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.tez.runtime.library.input;
  
  import java.io.IOException;
  
  import org.apache.hadoop.classification.InterfaceAudience.Private;
  import org.apache.hadoop.io.DataInputBuffer;
  import org.apache.hadoop.util.Progress;
  import org.apache.tez.dag.api.TezException;
  import org.apache.tez.runtime.api.InputContext;
  import org.apache.tez.runtime.library.common.sort.impl.TezRawKeyValueIterator;
  
  @Private
  public class CelebornOrderedGroupedInputLegacy extends CelebornOrderedGroupedKVInput {
  
    private final Progress progress = new Progress();
  
    public CelebornOrderedGroupedInputLegacy(InputContext inputContext, int numPhysicalInputs) {
      super(inputContext, numPhysicalInputs);
    }
  
    @Private
    public TezRawKeyValueIterator getIterator()
        throws IOException, InterruptedException, TezException {
      // wait for input so that iterator is available
      synchronized (this) {
        if (getNumPhysicalInputs() == 0) {
          return new TezRawKeyValueIterator() {
            @Override
            public DataInputBuffer getKey() throws IOException {
              throw new RuntimeException("No data available in Input");
            }
  
            @Override
            public DataInputBuffer getValue() throws IOException {
              throw new RuntimeException("No data available in Input");
            }
  
            @Override
            public boolean next() throws IOException {
              return false;
            }
  
            @Override
            public boolean hasNext() throws IOException {
              return false;
            }
  
            @Override
            public void close() throws IOException {}
  
            @Override
            public Progress getProgress() {
              progress.complete();
              return progress;
            }
  
            @Override
            public boolean isSameKey() throws IOException {
              throw new UnsupportedOperationException("isSameKey is not supported");
            }
          };
        }
      }
  
      waitForInputReady();
      synchronized (this) {
        return rawIter;
      }
    }
  }
  