| /** |
| * 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.contrib.redis; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.apache.apex.malhar.lib.util.KeyValPair; |
| |
| /** |
| * This is a Redis output operator, which takes key value pairs and writes them out to Redis. |
| * <p> |
| * This output adapter takes key value pairs as tuples and just writes to the redis store with the keys and the values in the key value pair |
| * Note: Redis output operator should never use the passthrough method because it begins a transaction at beginWindow and commits a transaction at |
| * endWindow, and a transaction in Redis blocks all other clients. |
| * </p> |
| * |
| * @displayName Redis Key Val Pair Output |
| * @category Output |
| * @tags redis, key value |
| * |
| * @param <K> The key type. |
| * @param <V> The value type. |
| * @since 0.3.2 |
| */ |
| public class RedisKeyValPairOutputOperator<K, V> extends AbstractRedisAggregateOutputOperator<KeyValPair<K, V>> |
| { |
| protected final Map<Object, Object> map = new HashMap<Object, Object>(); |
| |
| @Override |
| public void beginWindow(long windowId) |
| { |
| super.beginWindow(windowId); |
| map.clear(); |
| } |
| |
| @Override |
| public void processTuple(KeyValPair<K, V> t) |
| { |
| map.put(t.getKey(), t.getValue()); |
| } |
| |
| @Override |
| public void storeAggregate() |
| { |
| // RedisStore.putAll does not work for hash values |
| for (Map.Entry<Object, Object> entry : map.entrySet()) { |
| store.put(entry.getKey(), entry.getValue()); |
| } |
| } |
| |
| } |