| /** |
| * 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.contrib.redis; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| import com.datatorrent.lib.util.KeyValPair; |
| |
| /** |
| * This is the an implementation of a Redis input operator for fetching |
| * Key-Value pair stored in Redis. It takes in keys to fetch and emits |
| * corresponding <Key, Value> Pair. Value data type is String in this case. |
| * |
| * @displayName Redis Input Operator for Key Value pair |
| * @category Store |
| * @tags input operator, key value |
| * |
| * @since 3.1.0 |
| */ |
| |
| public class RedisKeyValueInputOperator extends AbstractRedisInputOperator<KeyValPair<String, String>> |
| { |
| private List<Object> keysObjectList = new ArrayList<Object>(); |
| |
| @Override |
| public void processTuples() |
| { |
| keysObjectList = new ArrayList<Object>(keys); |
| if (keysObjectList.size() > 0) { |
| |
| List<Object> allValues = store.getAll(keysObjectList); |
| for (int i = 0; i < allValues.size() && i < keys.size(); i++) { |
| if (allValues.get(i) == null) { |
| outputPort.emit(new KeyValPair<String, String>(keys.get(i), null)); |
| } else { |
| outputPort.emit(new KeyValPair<String, String>(keys.get(i), allValues.get(i).toString())); |
| } |
| } |
| keys.clear(); |
| keysObjectList.clear(); |
| } |
| } |
| |
| @Override |
| public KeyValPair<String, String> convertToTuple(Map<Object, Object> o) |
| { |
| // Do nothing for the override, Scan already done in processTuples |
| return null; |
| } |
| } |