| package org.apache.helix.model; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.text.DateFormat; |
| import java.text.SimpleDateFormat; |
| import java.util.ArrayList; |
| import java.util.Date; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TimeZone; |
| |
| import org.apache.helix.HelixProperty; |
| import org.apache.helix.ZNRecord; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * The history of participant. |
| */ |
| public class ParticipantHistory extends HelixProperty { |
| private static Logger LOG = LoggerFactory.getLogger(ParticipantHistory.class); |
| |
| private final static int HISTORY_SIZE = 20; |
| private enum ConfigProperty { |
| TIME, |
| DATE, |
| SESSION, |
| HISTORY, |
| OFFLINE, |
| VERSION, |
| LAST_OFFLINE_TIME |
| } |
| |
| public static long ONLINE = -1; |
| |
| public ParticipantHistory(String id) { |
| super(id); |
| } |
| |
| public ParticipantHistory(ZNRecord znRecord) { |
| super(znRecord); |
| } |
| |
| /** |
| * Called when a participant went offline or is about to go offline. |
| * This will update the offline timestamp in participant history. |
| */ |
| public void reportOffline() { |
| long time = System.currentTimeMillis(); |
| _record.setSimpleField(ConfigProperty.LAST_OFFLINE_TIME.name(), String.valueOf(time)); |
| updateOfflineHistory(time); |
| } |
| |
| /** |
| * Called when a participant goes online, this will update all related session history. |
| * |
| * @return |
| */ |
| public void reportOnline(String sessionId, String version) { |
| updateSessionHistory(sessionId, version); |
| _record.setSimpleField(ConfigProperty.LAST_OFFLINE_TIME.name(), String.valueOf(ONLINE)); |
| } |
| |
| /** |
| * Get the time when this node goes offline last time (epoch time). If the node is currently |
| * online or if no offline time is recorded, return -1. |
| * |
| * @return |
| */ |
| public long getLastOfflineTime() { |
| long offlineTime = ONLINE; |
| String timeStr = _record.getSimpleField(ConfigProperty.LAST_OFFLINE_TIME.name()); |
| if (timeStr != null) { |
| try { |
| offlineTime = Long.valueOf(timeStr); |
| } catch (NumberFormatException ex) { |
| LOG.warn("Failed to parse LAST_OFFLINE_TIME " + timeStr); |
| } |
| } |
| |
| return offlineTime; |
| } |
| |
| /** |
| * Add record to session online history list |
| */ |
| private void updateSessionHistory(String sessionId, String version) { |
| List<String> list = _record.getListField(ConfigProperty.HISTORY.name()); |
| if (list == null) { |
| list = new ArrayList<>(); |
| _record.setListField(ConfigProperty.HISTORY.name(), list); |
| } |
| |
| if (list.size() == HISTORY_SIZE) { |
| list.remove(0); |
| } |
| |
| Map<String, String> sessionEntry = new HashMap<String, String>(); |
| |
| sessionEntry.put(ConfigProperty.SESSION.name(), sessionId); |
| |
| long timeMillis = System.currentTimeMillis(); |
| sessionEntry.put(ConfigProperty.TIME.name(), String.valueOf(timeMillis)); |
| |
| DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss:SSS"); |
| df.setTimeZone(TimeZone.getTimeZone("UTC")); |
| String dateTime = df.format(new Date(timeMillis)); |
| sessionEntry.put(ConfigProperty.DATE.name(), dateTime); |
| sessionEntry.put(ConfigProperty.VERSION.name(), version); |
| |
| list.add(sessionEntry.toString()); |
| } |
| |
| private void updateOfflineHistory(long time) { |
| List<String> list = _record.getListField(ConfigProperty.OFFLINE.name()); |
| if (list == null) { |
| list = new ArrayList<>(); |
| _record.setListField(ConfigProperty.OFFLINE.name(), list); |
| } |
| |
| if (list.size() == HISTORY_SIZE) { |
| list.remove(0); |
| } |
| |
| DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss:SSS"); |
| df.setTimeZone(TimeZone.getTimeZone("UTC")); |
| String dateTime = df.format(new Date(time)); |
| |
| list.add(dateTime); |
| } |
| |
| @Override |
| public boolean isValid() { |
| return true; |
| } |
| } |