| /* |
| * 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.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.NavigableSet; |
| |
| import com.fasterxml.jackson.core.JsonGenerator; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import org.apache.gossip.LocalMember; |
| import org.apache.gossip.crdt.CrdtModule; |
| import org.apache.log4j.Logger; |
| |
| public class RingStatePersister implements Runnable { |
| |
| private static final Logger LOGGER = Logger.getLogger(RingStatePersister.class); |
| private final File path; |
| // NOTE: this is a different instance than what gets used for message marshalling. |
| private final ObjectMapper objectMapper; |
| private final GossipManager manager; |
| |
| public RingStatePersister(File path, GossipManager manager){ |
| this.path = path; |
| this.objectMapper = GossipManager.metdataObjectMapper; |
| this.manager = manager; |
| } |
| |
| @Override |
| public void run() { |
| writeToDisk(); |
| } |
| |
| void writeToDisk() { |
| NavigableSet<LocalMember> i = manager.getMembers().keySet(); |
| try (FileOutputStream fos = new FileOutputStream(path)){ |
| objectMapper.writeValue(fos, i); |
| } catch (IOException e) { |
| LOGGER.debug(e); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| List<LocalMember> readFromDisk() { |
| if (!path.exists()) { |
| return new ArrayList<>(); |
| } |
| try (FileInputStream fos = new FileInputStream(path)){ |
| return objectMapper.readValue(fos, ArrayList.class); |
| } catch (IOException e) { |
| LOGGER.debug(e); |
| } |
| return new ArrayList<>(); |
| } |
| } |