samoa-samza/src/main/java/org/apache/samoa/topology/impl/SamzaTopology.java

/*
 * 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.samoa.topology.impl;

import java.util.HashSet;
import java.util.Set;

import org.apache.samoa.topology.AbstractTopology;
import org.apache.samoa.topology.IProcessingItem;

/**
 * Topology for Samza
 * 
 * @author Anh Thu Vu
 */
public class SamzaTopology extends AbstractTopology {
  private int procItemCounter;

  public SamzaTopology(String topoName) {
    super(topoName);
    procItemCounter = 0;
  }

  @Override
  public void addProcessingItem(IProcessingItem procItem, int parallelism) {
    super.addProcessingItem(procItem, parallelism);
    SamzaProcessingNode samzaPi = (SamzaProcessingNode) procItem;
    samzaPi.setName(this.getTopologyName() + "-" + Integer.toString(procItemCounter));
    procItemCounter++;
  }

  /*
   * Gets the set of ProcessingItems, excluding EntrancePIs Used by
   * SamzaConfigFactory as the config for EntrancePIs and normal PIs are
   * different
   */
  public Set<IProcessingItem> getNonEntranceProcessingItems() throws Exception {
    Set<IProcessingItem> copiedSet = new HashSet<IProcessingItem>();
    copiedSet.addAll(this.getProcessingItems());
    boolean result = copiedSet.removeAll(this.getEntranceProcessingItems());
    if (!result) {
      throw new Exception("Failed extracting the set of non-entrance processing items");
    }
    return copiedSet;
  }
}