| /* |
| * Copyright (c) 2014 DataTorrent, Inc. ALL Rights Reserved. |
| * |
| * 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.demos.dimensions.generic; |
| |
| import com.datatorrent.api.DefaultOutputPort; |
| import com.datatorrent.demos.dimensions.ads.AdInfo; |
| import com.datatorrent.demos.dimensions.ads.InputItemGenerator; |
| import org.codehaus.jackson.map.ObjectMapper; |
| |
| /** |
| * Generates AdInfo events and sends them out in JSON format. |
| * <p> |
| * By default 10000 events are generated in every window. See {@link com.datatorrent.demos.dimensions.ads.InputItemGenerator} |
| * for additional details on tunable settings settings like blastCount, numPublishers, numAdvertisers, numAdUnits, etc. |
| * |
| * @displayName JSON AdInfo Generator |
| * @category Input |
| * @tags input, generator |
| * |
| * @since 2.0.0 |
| */ |
| public class JsonAdInfoGenerator extends InputItemGenerator |
| { |
| public final transient DefaultOutputPort<byte[]> jsonOutput = new DefaultOutputPort<byte[]>(); |
| private static final ObjectMapper mapper = new ObjectMapper(); |
| |
| // Limit number of emitted tuples per window |
| private long maxTuplesPerWindow = 40000; |
| private long currentTuplesInWindow = 0; |
| |
| public long getMaxTuplesPerWindow() { |
| return maxTuplesPerWindow; |
| } |
| |
| public void setMaxTuplesPerWindow(long maxTuplesPerWindow) { |
| this.maxTuplesPerWindow = maxTuplesPerWindow; |
| } |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| currentTuplesInWindow = 0; |
| super.beginWindow(windowId); |
| } |
| |
| @Override |
| public void emitTuple(AdInfo adInfo) |
| { |
| if (currentTuplesInWindow++ <= maxTuplesPerWindow) { |
| try { |
| this.jsonOutput.emit(mapper.writeValueAsBytes(adInfo)); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| } |