| /* |
| * 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.gearpump.streaming.dsl.task |
| |
| import java.time.Instant |
| |
| import org.apache.gearpump.Message |
| import org.apache.gearpump.cluster.UserConfig |
| import org.apache.gearpump.streaming.Constants._ |
| import org.apache.gearpump.streaming.dsl.window.api.CountWindowFn |
| import org.apache.gearpump.streaming.dsl.window.impl.{DefaultWindowRunner, GroupAlsoByWindow, WindowRunner} |
| import org.apache.gearpump.streaming.task.{Task, TaskContext} |
| |
| /** |
| * This task triggers output on number of messages in a window. |
| */ |
| class CountTriggerTask[IN, GROUP]( |
| groupBy: GroupAlsoByWindow[IN, GROUP], |
| windowRunner: WindowRunner, |
| taskContext: TaskContext, |
| userConfig: UserConfig) |
| extends Task(taskContext, userConfig) { |
| |
| def this(groupBy: GroupAlsoByWindow[IN, GROUP], |
| taskContext: TaskContext, userConfig: UserConfig) = { |
| this(groupBy, new DefaultWindowRunner(taskContext, userConfig, groupBy)(taskContext.system), |
| taskContext, userConfig) |
| } |
| |
| def this(taskContext: TaskContext, userConfig: UserConfig) = { |
| this(userConfig.getValue[GroupAlsoByWindow[IN, GROUP]]( |
| GEARPUMP_STREAMING_GROUPBY_FUNCTION)(taskContext.system).get, |
| taskContext, userConfig) |
| } |
| |
| private val windowSize = groupBy.window.windowFn.asInstanceOf[CountWindowFn].size |
| private var num = 0 |
| |
| override def onNext(msg: Message): Unit = { |
| windowRunner.process(msg) |
| num += 1 |
| if (windowSize == num) { |
| windowRunner.trigger(Instant.ofEpochMilli(windowSize)) |
| num = 0 |
| } |
| } |
| } |