samoa-apex/src/main/java/org/apache/samoa/apex/topology/impl/DelayOperatorSerializable.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.apex.topology.impl;

import java.io.Serializable;

import com.datatorrent.common.util.DefaultDelayOperator;
import com.esotericsoftware.kryo.DefaultSerializer;
import com.esotericsoftware.kryo.serializers.JavaSerializer;

@DefaultSerializer(JavaSerializer.class)
public class DelayOperatorSerializable<T> extends DefaultDelayOperator<T> implements Serializable {

  private static final long serialVersionUID = -2972537213450678368L;

  public final DefaultInputPortSerializable<T> input = new DefaultInputPortSerializable<T>() {

  private static final long serialVersionUID = 6830919916828325819L;

  @Override
  public void process(T tuple) {
      processTuple(tuple);
    }
  };
  
  public final DefaultOutputPortSerializable<T> output = new DefaultOutputPortSerializable<>();

  protected void processTuple(T tuple)
  {
    lastWindowTuples.add(tuple);
    output.emit(tuple);
  }

  @Override
  public void firstWindow()
  {
    for (T tuple : lastWindowTuples) {
      output.emit(tuple);
    }
  }

}