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 com.aliyun.odps.mapred.local.pipeline;
  
  
  import org.junit.Before;
  import org.junit.Test;
  
  import com.aliyun.odps.Column;
  import com.aliyun.odps.OdpsType;
  import com.aliyun.odps.mapred.JobClient;
  import com.aliyun.odps.mapred.conf.JobConf;
  import com.aliyun.odps.mapred.local.utils.TestUtils;
  import com.aliyun.odps.pipeline.Pipeline;
  import com.aliyun.odps.pipeline.Pipeline.Builder;
  
  /**
   * Identity
   *
   * @author yubin.byb
   */
  public class Identity extends PipelineExampleBase {
  
    @Before
    public void setUp() throws Exception {
      TestUtils.setEnvironment(TestUtils.pipe);
    }
  
    @Test
    public void test() throws Exception {
      String[] args = new String[3];
      args[0] = "l_ss";
      args[1] = "pipe_identity_out";
      args[2] = "5";
      if (args.length != 2 && args.length != 3) {
        System.err
            .println("Usage: Identity <[project.]in_table> <[project.]out_table> [reducer_num]");
        System.exit(2);
      }
  
      JobConf job = new JobConf();
      Builder builder = Pipeline.builder();
      int nReducer = 2;
  
      if (args.length == 3) {
        nReducer = Integer.parseInt(args[2]);
      }
  
      // mapper
      builder
          .addMapper(IdentityMapper.class)
          .setOutputKeySchema(
              new Column[]{new Column("key", OdpsType.STRING), new Column("value", OdpsType.STRING)})
          .setOutputValueSchema(new Column[]{new Column("value", OdpsType.STRING)});
  
      // reducer
      for (int count = 0; count < nReducer; count++) {
        if (count < nReducer - 1) {
          builder
              .addReducer(IdentityIReducer.class)
              .setOutputKeySchema(
                  new Column[]{new Column("key", OdpsType.STRING),
                               new Column("value", OdpsType.STRING)})
              .setOutputValueSchema(new Column[]{new Column("value", OdpsType.STRING)});
        } else {
          builder.addReducer(IdentityReducer.class);
        }
      }
  
      Pipeline pipeline = builder.createPipeline();
  
      addInputTable(job, args[0]);
      addOutputTable(job, args[1]);
  
      JobClient.runJob(job, pipeline);
    }
  }
  