| /** |
| * Copyright (C) 2015 DataTorrent, Inc. |
| * |
| * Licensed 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.stram.engine; |
| |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datatorrent.api.Sink; |
| import com.datatorrent.bufferserver.packet.MessageType; |
| import com.datatorrent.stram.tuple.EndStreamTuple; |
| import com.datatorrent.stram.tuple.Tuple; |
| |
| /** |
| * <p>WindowIdActivatedReservoir class.</p> |
| * |
| * @since 0.3.2 |
| */ |
| public class WindowIdActivatedReservoir implements SweepableReservoir |
| { |
| private Sink<Object> sink; |
| private final String identifier; |
| private final SweepableReservoir reservoir; |
| private final long windowId; |
| EndStreamTuple est; |
| |
| public WindowIdActivatedReservoir(String identifier, SweepableReservoir reservoir, final long windowId) |
| { |
| this.identifier = identifier; |
| this.reservoir = reservoir; |
| this.windowId = windowId; |
| |
| reservoir.setSink(Sink.BLACKHOLE); |
| } |
| |
| @Override |
| public int size() |
| { |
| return reservoir.size(); |
| } |
| |
| @Override |
| public Object remove() |
| { |
| if (est == null) { |
| return reservoir.remove(); |
| } |
| |
| try { |
| return est; |
| } |
| finally { |
| est = null; |
| } |
| } |
| |
| @Override |
| public Sink<Object> setSink(Sink<Object> sink) |
| { |
| try { |
| return this.sink; |
| } |
| finally { |
| this.sink = sink; |
| } |
| } |
| |
| @Override |
| public Tuple sweep() |
| { |
| Tuple t; |
| while ((t = reservoir.sweep()) != null) { |
| if (t.getType() == MessageType.BEGIN_WINDOW && t.getWindowId() > windowId) { |
| reservoir.setSink(sink); |
| return (est = new EndStreamTuple(windowId)); |
| } |
| reservoir.remove(); |
| } |
| |
| return null; |
| } |
| |
| @Override |
| public int getCount(boolean reset) |
| { |
| return 0; |
| } |
| |
| @Override |
| public String toString() |
| { |
| return "WindowIdActivatedReservoir{" + "identifier=" + identifier + ", windowId=" + windowId + '}'; |
| } |
| |
| private static final Logger logger = LoggerFactory.getLogger(WindowIdActivatedReservoir.class); |
| } |