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

package org.apache.samoa.topology.impl;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2014 - 2015 Apache Software Foundation
 * %%
 * Licensed 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.
 * #L%
 */

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;
  }
}