WatermarkTriggerPolicy.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 com.alibaba.jstorm.window;

/**
 * @author wange
 * @since 01/01/2017
 */
public enum WatermarkTriggerPolicy {
    /**
     * global max timestamp, window will be fired as long as a watermark from one task > window end
     */
    GLOBAL_MAX_TIMESTAMP,

    /**
     * max timestamp + received watermark task ratio
     */
    MAX_TIMESTAMP_WITH_RATIO,

    /**
     * received watermarks from all upstream tasks and all watermarks > window end
     */
    TASK_MAX_GLOBAL_MIN_TIMESTAMP
}