| /* |
| * 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.gossip.manager; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import org.apache.gossip.model.PerNodeDataMessage; |
| import org.apache.gossip.model.SharedDataMessage; |
| import org.apache.log4j.Logger; |
| |
| public class UserDataPersister implements Runnable { |
| |
| private static final Logger LOGGER = Logger.getLogger(UserDataPersister.class); |
| private final GossipCore gossipCore; |
| |
| private final File perNodePath; |
| private final File sharedPath; |
| private final ObjectMapper objectMapper; |
| |
| UserDataPersister(GossipCore gossipCore, File perNodePath, File sharedPath) { |
| this.gossipCore = gossipCore; |
| this.objectMapper = GossipManager.metdataObjectMapper; |
| this.perNodePath = perNodePath; |
| this.sharedPath = sharedPath; |
| } |
| |
| @SuppressWarnings("unchecked") |
| ConcurrentHashMap<String, ConcurrentHashMap<String, PerNodeDataMessage>> readPerNodeFromDisk(){ |
| if (!perNodePath.exists()) { |
| return new ConcurrentHashMap<String, ConcurrentHashMap<String, PerNodeDataMessage>>(); |
| } |
| try (FileInputStream fos = new FileInputStream(perNodePath)){ |
| return objectMapper.readValue(fos, ConcurrentHashMap.class); |
| } catch (IOException e) { |
| LOGGER.debug(e); |
| } |
| return new ConcurrentHashMap<String, ConcurrentHashMap<String, PerNodeDataMessage>>(); |
| } |
| |
| void writePerNodeToDisk(){ |
| try (FileOutputStream fos = new FileOutputStream(perNodePath)){ |
| objectMapper.writeValue(fos, gossipCore.getPerNodeData()); |
| } catch (IOException e) { |
| LOGGER.warn(e); |
| } |
| } |
| |
| void writeSharedToDisk(){ |
| try (FileOutputStream fos = new FileOutputStream(sharedPath)){ |
| objectMapper.writeValue(fos, gossipCore.getSharedData()); |
| } catch (IOException e) { |
| LOGGER.warn(e); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| ConcurrentHashMap<String, SharedDataMessage> readSharedDataFromDisk(){ |
| if (!sharedPath.exists()) { |
| return new ConcurrentHashMap<>(); |
| } |
| try (FileInputStream fos = new FileInputStream(sharedPath)){ |
| return objectMapper.readValue(fos, ConcurrentHashMap.class); |
| } catch (IOException e) { |
| LOGGER.debug(e); |
| } |
| return new ConcurrentHashMap<String, SharedDataMessage>(); |
| } |
| |
| /** |
| * Writes all pernode and shared data to disk |
| */ |
| @Override |
| public void run() { |
| writePerNodeToDisk(); |
| writeSharedToDisk(); |
| } |
| } |