ApexEntranceProcessingItem.java

package org.apache.samoa.apex.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.UUID;

import org.apache.samoa.core.EntranceProcessor;
import org.apache.samoa.topology.AbstractEntranceProcessingItem;

/**
 * EntranceProcessingItem implementation for Apache Apex.
 */
public class ApexEntranceProcessingItem extends AbstractEntranceProcessingItem implements ApexTopologyNode {

  private final ApexInputOperator inputOperator;
  private int numStreams;

  public ApexEntranceProcessingItem() {
    inputOperator = null;
  }

  // Constructor
  public ApexEntranceProcessingItem(EntranceProcessor processor) {
    this(processor, UUID.randomUUID().toString());
  }

  // Constructor
  public ApexEntranceProcessingItem(EntranceProcessor processor, String friendlyId) {
    super(processor);
    this.setName(friendlyId);
    this.inputOperator = new ApexInputOperator(processor);
  }

  @Override
  public void addToTopology(ApexTopology topology, int parallelismHint) {
    topology.getDAG().addOperator(this.getName(), inputOperator);
    //add num partitions
  }

  @Override
  public ApexStream createStream() {
    return inputOperator.createStream("Stream_from_" + this.getName() + "_#" + numStreams++);
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder(super.toString());
    sb.insert(0, String.format("id: %s, ", this.getName()));
    return sb.toString();
  }
}