org.apache.apex.malhar.stream.api.WindowedStream Maven / Gradle / Ivy

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/**
 * 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.apex.malhar.stream.api;

/**
 * 
 * A stream with windowed transformation
 * 
 * 
 * Transformation types:
 * 

 * Combine
 * Group
 * Keyed Combine
 * Keyed Group
 * Join
 * CoGroup
 * 
 * 
 * 
 * Features supported with windowed transformation 
 * 

 * Watermark - Ingestion time watermark / logical tuple watermark
 * Early Triggers - How frequent to emit real-time partial result
 * Late Triggers - When to emit updated result with tuple comes after watermark
 * Customizable Trigger Behaviour - What to do when fires a trigger
 * Spool window state -  In-Memory window state can be spooled to disk if it is full
 * 3 different accumulation models: ignore, accumulation, accumulation + delta
 * Window support: Non-Mergeable window(fix window, sliding window), Mergeable window(session window) base on 3 different tuple time
 * Different tuple time support: event time, system time, ingestion time
 * 
 * 
 *
 * @param  Output tuple type
 *
 * @since 3.4.0
 */
public interface WindowedStream extends ApexStream
{
}