| /** |
| * 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.lib.window.impl; |
| |
| import java.util.AbstractMap; |
| import java.util.ArrayList; |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| |
| import org.apache.apex.malhar.lib.state.spillable.Spillable; |
| import org.apache.apex.malhar.lib.utils.serde.Serde; |
| import org.apache.apex.malhar.lib.window.SessionWindowedStorage; |
| import org.apache.apex.malhar.lib.window.Window; |
| import org.apache.commons.lang3.tuple.ImmutablePair; |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| import com.datatorrent.api.Context; |
| |
| /** |
| * Spillable session windowed storage. |
| * |
| * @since 3.6.0 |
| */ |
| @InterfaceStability.Evolving |
| public class SpillableSessionWindowedStorage<K, V> extends SpillableWindowedKeyedStorage<K, V> implements SessionWindowedStorage<K, V> |
| { |
| // additional key to windows map for fast lookup of windows using key |
| private Spillable.SpillableSetMultimap<K, Window.SessionWindow<K>> keyToWindowsMap; |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void setup(Context.OperatorContext context) |
| { |
| super.setup(context); |
| if (keyToWindowsMap == null) { |
| // NOTE: this will pose difficulties when we try to assign the entries to a time bucket later on. |
| // This is logged in APEXMALHAR-2271 |
| keyToWindowsMap = scc.newSpillableSetMultimap(bucket, keySerde, (Serde<Window.SessionWindow<K>>)(Serde)windowSerde); |
| } |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public void remove(Window window) |
| { |
| super.remove(window); |
| Window.SessionWindow<K> sessionWindow = (Window.SessionWindow<K>)window; |
| keyToWindowsMap.remove(sessionWindow.getKey(), sessionWindow); |
| } |
| |
| @Override |
| public void put(Window window, K key, V value) |
| { |
| super.put(window, key, value); |
| @SuppressWarnings("unchecked") |
| Window.SessionWindow<K> sessionWindow = (Window.SessionWindow<K>)window; |
| if (!keyToWindowsMap.containsEntry(key, sessionWindow)) { |
| keyToWindowsMap.put(key, sessionWindow); |
| } |
| } |
| |
| @Override |
| public void migrateWindow(Window.SessionWindow<K> fromWindow, Window.SessionWindow<K> toWindow) |
| { |
| K key = fromWindow.getKey(); |
| ImmutablePair<Window, K> oldKey = new ImmutablePair<Window, K>(fromWindow, key); |
| ImmutablePair<Window, K> newKey = new ImmutablePair<Window, K>(toWindow, key); |
| V value = windowKeyToValueMap.get(oldKey); |
| if (value == null) { |
| throw new NoSuchElementException(); |
| } |
| windowKeyToValueMap.remove(oldKey); |
| windowKeyToValueMap.put(newKey, value); |
| keyToWindowsMap.remove(key, fromWindow); |
| keyToWindowsMap.put(key, toWindow); |
| windowToKeysMap.removeAll(fromWindow); |
| windowToKeysMap.put(toWindow, key); |
| } |
| |
| @Override |
| public Collection<Map.Entry<Window.SessionWindow<K>, V>> getSessionEntries(K key, long timestamp, long gap) |
| { |
| List<Map.Entry<Window.SessionWindow<K>, V>> results = new ArrayList<>(); |
| Set<Window.SessionWindow<K>> sessionWindows = keyToWindowsMap.get(key); |
| if (sessionWindows != null) { |
| for (Window.SessionWindow<K> window : sessionWindows) { |
| if (timestamp > window.getBeginTimestamp()) { |
| if (window.getBeginTimestamp() + window.getDurationMillis() > timestamp) { |
| results.add(new AbstractMap.SimpleEntry<>(window, windowKeyToValueMap.get(new ImmutablePair<Window, K>(window, key)))); |
| } |
| } else if (timestamp < window.getBeginTimestamp()) { |
| if (window.getBeginTimestamp() - gap <= timestamp) { |
| results.add(new AbstractMap.SimpleEntry<>(window, windowKeyToValueMap.get(new ImmutablePair<Window, K>(window, key)))); |
| } |
| } else { |
| results.add(new AbstractMap.SimpleEntry<>(window, windowKeyToValueMap.get(new ImmutablePair<Window, K>(window, key)))); |
| } |
| } |
| } |
| return results; |
| } |
| } |