| /** |
| * 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.storm.streams.processors; |
| |
| import org.apache.storm.state.KeyValueState; |
| import org.apache.storm.streams.Pair; |
| import org.apache.storm.streams.StreamState; |
| |
| public class StateQueryProcessor<K, V> extends BaseProcessor<K> implements StatefulProcessor<K, V> { |
| private final StreamState<K, V> streamState; |
| private KeyValueState<K, V> keyValueState; |
| |
| public StateQueryProcessor(StreamState<K, V> streamState) { |
| this.streamState = streamState; |
| } |
| |
| @Override |
| public void initState(KeyValueState<K, V> keyValueState) { |
| this.keyValueState = keyValueState; |
| } |
| |
| public StreamState<K, V> getStreamState() { |
| return streamState; |
| } |
| |
| @Override |
| protected void execute(K key) { |
| V value = keyValueState.get(key); |
| if (value != null) { |
| context.forward(Pair.of(key, value)); |
| } |
| } |
| } |