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SAMZA-1108: Implementation of Windows and various kinds of Triggers
* Implemented various triggers and the orchestration logic of the window operator. * Implemented wire-up of window and the flow of messages through various trigger implementations. * Implementations for count, time, timeSinceFirst, timeSinceLast, Any, Repeating triggers. Author: vjagadish1989 <jvenkatr@linkedin.com> Reviewers: Yi Pan (Data Infrastructure) <nickpan47@gmail.com>, Prateek Maheshwari <pmaheshw@linkedin.com>, Chris Pettitt <cpettitt@linkedin.com> Closes apache#66 from vjagadish1989/window-impl
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36 changes: 36 additions & 0 deletions
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samza-api/src/main/java/org/apache/samza/operators/functions/FoldLeftFunction.java
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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. | ||
*/ | ||
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package org.apache.samza.operators.functions; | ||
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/** | ||
* A fold function that incrementally combines and aggregates values for a window. | ||
*/ | ||
public interface FoldLeftFunction<M, WV> extends InitableFunction { | ||
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/** | ||
* Incrementally combine and aggregate values for the window. Guaranteed to be invoked for every | ||
* message added to the window. | ||
* | ||
* @param message the incoming message that is added to the window. This object should not be mutated. | ||
* @param oldValue the previous value | ||
* @return the new value | ||
*/ | ||
WV apply(M message, WV oldValue); | ||
} |
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samza-api/src/main/java/org/apache/samza/operators/triggers/FiringType.java
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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.samza.operators.triggers; | ||
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/** | ||
* The type of the {@link org.apache.samza.operators.triggers.Trigger} firing. | ||
* Firings can be either early or late or default. Late triggers are not supported currently. | ||
*/ | ||
public enum FiringType { | ||
EARLY, | ||
DEFAULT, | ||
LATE | ||
} |
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