| /** |
| * 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; |
| |
| import org.apache.hadoop.classification.InterfaceStability; |
| |
| /** |
| * This interface describes the classes that represent individual windows. |
| * |
| * @param <WINDOW> window type the object of this class can call compareTo |
| * |
| * @since 3.5.0 |
| */ |
| @InterfaceStability.Evolving |
| public interface Window<WINDOW extends Comparable<WINDOW>> extends Comparable<WINDOW> |
| { |
| long getBeginTimestamp(); |
| |
| long getDurationMillis(); |
| |
| /** |
| * Global window means there is only one window that spans the entire life time of the application |
| */ |
| class GlobalWindow implements Window<GlobalWindow> |
| { |
| |
| /** |
| * The singleton global window |
| */ |
| public static final GlobalWindow INSTANCE = new GlobalWindow(); |
| |
| private GlobalWindow() |
| { |
| } |
| |
| @Override |
| public long getBeginTimestamp() |
| { |
| return 0; |
| } |
| |
| public long getDurationMillis() |
| { |
| return Long.MAX_VALUE; |
| } |
| |
| @Override |
| public boolean equals(Object other) |
| { |
| return this == other; |
| } |
| |
| @Override |
| public int compareTo(GlobalWindow o) |
| { |
| return 0; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "[GlobalWindow]"; |
| } |
| } |
| |
| /** |
| * TimeWindow is a window that represents a time slice |
| * |
| * @param <WINDOW> window type the object of this class can call compareTo |
| */ |
| class TimeWindow<WINDOW extends TimeWindow<WINDOW>> implements Window<WINDOW> |
| { |
| protected final long beginTimestamp; |
| protected final long durationMillis; |
| |
| private TimeWindow() |
| { |
| // for kryo |
| this.beginTimestamp = -1; |
| this.durationMillis = 0; |
| } |
| |
| public TimeWindow(long beginTimestamp, long durationMillis) |
| { |
| this.beginTimestamp = beginTimestamp; |
| this.durationMillis = durationMillis; |
| } |
| |
| /** |
| * Gets the beginning timestamp of this window |
| * |
| * @return the begin timestamp |
| */ |
| @Override |
| public long getBeginTimestamp() |
| { |
| return beginTimestamp; |
| } |
| |
| /** |
| * Gets the duration millis of this window |
| * |
| * @return the duration |
| */ |
| @Override |
| public long getDurationMillis() |
| { |
| return durationMillis; |
| } |
| |
| @Override |
| public boolean equals(Object other) |
| { |
| if (other instanceof TimeWindow) { |
| TimeWindow otherWindow = (TimeWindow)other; |
| return this.beginTimestamp == otherWindow.beginTimestamp && this.durationMillis == otherWindow.durationMillis; |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| int result = (int)(beginTimestamp ^ (beginTimestamp >>> 32)); |
| result = 31 * result + (int)(durationMillis ^ (durationMillis >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public int compareTo(TimeWindow o) |
| { |
| if (this.getBeginTimestamp() < o.getBeginTimestamp()) { |
| return -1; |
| } else if (this.getBeginTimestamp() > o.getBeginTimestamp()) { |
| return 1; |
| } else if (this.getDurationMillis() < o.getDurationMillis()) { |
| return -1; |
| } else if (this.getDurationMillis() > o.getDurationMillis()) { |
| return 1; |
| } |
| return 0; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "[TimeWindow " + getBeginTimestamp() + "(" + getDurationMillis() + ")]"; |
| } |
| } |
| |
| /** |
| * SessionWindow is a window that represents a time slice for a key, with the time slice being variable length. |
| * |
| * @param <K> the key type for the session |
| */ |
| class SessionWindow<K> extends TimeWindow<SessionWindow<K>> |
| { |
| private final K key; |
| |
| private SessionWindow() |
| { |
| // for kryo |
| this.key = null; |
| } |
| |
| public SessionWindow(K key, long beginTimestamp, long duration) |
| { |
| super(beginTimestamp, duration); |
| this.key = key; |
| } |
| |
| public K getKey() |
| { |
| return key; |
| } |
| |
| @Override |
| public boolean equals(Object other) |
| { |
| if (!super.equals(other)) { |
| return false; |
| } |
| if (other instanceof SessionWindow) { |
| @SuppressWarnings("unchecked") |
| SessionWindow<K> otherSessionWindow = (SessionWindow<K>)other; |
| if (key == null) { |
| return otherSessionWindow.key == null; |
| } else { |
| return key.equals(otherSessionWindow.key); |
| } |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return (key.hashCode() << 16) | super.hashCode(); |
| } |
| |
| @Override |
| public int compareTo(SessionWindow<K> o) |
| { |
| int val = super.compareTo(o); |
| if (val == 0) { |
| if (this.getKey() instanceof Comparable) { |
| return ((Comparable<K>)this.getKey()).compareTo(o.getKey()); |
| } else { |
| return Long.compare(this.getKey().hashCode(), o.getKey().hashCode()); |
| } |
| } else { |
| return val; |
| } |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "[SessionWindow key=" + getKey() + " " + getBeginTimestamp() + "(" + getDurationMillis() + ")]"; |
| } |
| } |
| } |