| /** |
| * 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.datatorrent.lib.util.time; |
| |
| import java.math.BigDecimal; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.google.common.base.Preconditions; |
| |
| import com.datatorrent.api.Context.DAGContext; |
| import com.datatorrent.api.Context.OperatorContext; |
| |
| /** |
| * This a is class which holds utility functions that can be used by operators to perform common |
| * tasks. |
| * |
| * @since 3.3.0 |
| */ |
| public class WindowUtils |
| { |
| /** |
| * Computes the duration of an Operator's application window in milliseconds. |
| * @param context The context of the Operator whose application window duration is |
| * being computed. |
| * @return The duration of an Operator's application window in milliseconds. |
| */ |
| public static long getAppWindowDurationMs(OperatorContext context) |
| { |
| return context.getValue(DAGContext.STREAMING_WINDOW_SIZE_MILLIS).longValue() * |
| context.getValue(OperatorContext.APPLICATION_WINDOW_COUNT).longValue(); |
| } |
| |
| /** |
| * Computes the number of application windows that will fit into the given |
| * millisecond duration. This method rounds the number of application windows up. |
| * @param context The context of the Operator for which the number of application |
| * windows is being computed. |
| * @param millis The millisecond duration to compute the number of application windows for. |
| * @return The number of application windows that will fit into the given millisecond duration. |
| */ |
| public static long msToAppWindowCount(OperatorContext context, long millis) |
| { |
| Preconditions.checkArgument(millis > 0); |
| long appWindowDurationMS = getAppWindowDurationMs(context); |
| long appWindowCount = millis / appWindowDurationMS; |
| |
| if (millis % appWindowDurationMS != 0) { |
| appWindowCount++; |
| } |
| |
| return appWindowCount; |
| } |
| |
| /** |
| * Converts tuples per second into tuples per application window. The value for |
| * tuples per application window is rounded up. |
| * @param context The context of the Operator for which tuples per application window is |
| * being computed. |
| * @param tuplesPerSecond Tuples per second. |
| * @return Tuples per application window. |
| */ |
| public static long tpsToTpw(OperatorContext context, long tuplesPerSecond) |
| { |
| Preconditions.checkArgument(tuplesPerSecond > 0); |
| BigDecimal tuplesPerWindow = new BigDecimal(getAppWindowDurationMs(context)); |
| tuplesPerWindow = tuplesPerWindow.divide(new BigDecimal(1000)); |
| tuplesPerWindow = tuplesPerWindow.multiply(new BigDecimal(tuplesPerSecond)); |
| |
| Preconditions.checkArgument(tuplesPerWindow.compareTo(new BigDecimal(Long.MAX_VALUE)) <= 0, |
| "Overflow computing tuples per window."); |
| |
| tuplesPerWindow = tuplesPerWindow.stripTrailingZeros(); |
| long tuplesPerWindowLong = tuplesPerWindow.longValue(); |
| |
| if (tuplesPerWindow.scale() > 0) { |
| LOG.debug("{}", tuplesPerWindow); |
| tuplesPerWindowLong++; |
| } |
| |
| return tuplesPerWindowLong; |
| } |
| |
| private static final Logger LOG = LoggerFactory.getLogger(WindowUtils.class); |
| } |