| /* |
| * 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.iotdb.confignode.manager.load.heartbeat; |
| |
| import org.apache.iotdb.commons.cluster.RegionStatus; |
| import org.apache.iotdb.tsfile.utils.Pair; |
| |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import static org.apache.iotdb.confignode.manager.load.heartbeat.BaseNodeCache.HEARTBEAT_TIMEOUT_TIME; |
| import static org.apache.iotdb.confignode.manager.load.heartbeat.BaseNodeCache.MAXIMUM_WINDOW_SIZE; |
| |
| public class RegionCache { |
| |
| private final List<RegionHeartbeatSample> slidingWindow; |
| |
| // Indicates the version of the statistics |
| private volatile long versionTimestamp; |
| private volatile RegionStatus status; |
| private volatile boolean isLeader; |
| |
| public RegionCache() { |
| this.slidingWindow = Collections.synchronizedList(new LinkedList<>()); |
| |
| this.versionTimestamp = 0; |
| this.status = RegionStatus.Unknown; |
| this.isLeader = false; |
| } |
| |
| public void cacheHeartbeatSample(RegionHeartbeatSample newHeartbeatSample) { |
| synchronized (slidingWindow) { |
| // Only sequential HeartbeatSamples are accepted. |
| // And un-sequential HeartbeatSamples will be discarded. |
| if (slidingWindow.size() == 0 |
| || getLastSample().getSendTimestamp() < newHeartbeatSample.getSendTimestamp()) { |
| slidingWindow.add(newHeartbeatSample); |
| } |
| |
| if (slidingWindow.size() > MAXIMUM_WINDOW_SIZE) { |
| slidingWindow.remove(0); |
| } |
| } |
| } |
| |
| public void updateStatistics() { |
| synchronized (slidingWindow) { |
| RegionHeartbeatSample lastSample = getLastSample(); |
| if (lastSample.getSendTimestamp() > versionTimestamp) { |
| versionTimestamp = lastSample.getSendTimestamp(); |
| isLeader = lastSample.isLeader(); |
| } |
| |
| status = |
| System.currentTimeMillis() - versionTimestamp > HEARTBEAT_TIMEOUT_TIME |
| ? RegionStatus.Unknown |
| : RegionStatus.Running; |
| } |
| } |
| |
| public RegionStatus getStatus() { |
| return status; |
| } |
| |
| /** @return Pair<Last update time, is leader> */ |
| public Pair<Long, Boolean> isLeader() { |
| return new Pair<>(versionTimestamp, isLeader); |
| } |
| |
| private RegionHeartbeatSample getLastSample() { |
| return slidingWindow.get(slidingWindow.size() - 1); |
| } |
| } |