| /* |
| * 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.cassandra.transport; |
| |
| import java.net.InetAddress; |
| import java.util.ArrayList; |
| import java.util.EnumMap; |
| import java.util.List; |
| |
| import com.github.benmanes.caffeine.cache.Cache; |
| import com.github.benmanes.caffeine.cache.Caffeine; |
| import com.github.benmanes.caffeine.cache.LoadingCache; |
| |
| import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis; |
| |
| /** |
| * This class tracks the last 100 connections per protocol version |
| */ |
| public class ProtocolVersionTracker |
| { |
| private static final int DEFAULT_MAX_CAPACITY = 100; |
| |
| private final EnumMap<ProtocolVersion, LoadingCache<InetAddress, Long>> clientsByProtocolVersion; |
| |
| ProtocolVersionTracker() |
| { |
| this(DEFAULT_MAX_CAPACITY); |
| } |
| |
| private ProtocolVersionTracker(int capacity) |
| { |
| clientsByProtocolVersion = new EnumMap<>(ProtocolVersion.class); |
| |
| for (ProtocolVersion version : ProtocolVersion.values()) |
| { |
| clientsByProtocolVersion.put(version, Caffeine.newBuilder().maximumSize(capacity) |
| .build(key -> currentTimeMillis())); |
| } |
| } |
| |
| void addConnection(InetAddress addr, ProtocolVersion version) |
| { |
| clientsByProtocolVersion.get(version).put(addr, currentTimeMillis()); |
| } |
| |
| List<ClientStat> getAll() |
| { |
| List<ClientStat> result = new ArrayList<>(); |
| |
| clientsByProtocolVersion.forEach((version, cache) -> |
| cache.asMap().forEach((address, lastSeenTime) -> result.add(new ClientStat(address, version, lastSeenTime)))); |
| |
| return result; |
| } |
| |
| List<ClientStat> getAll(ProtocolVersion version) |
| { |
| List<ClientStat> result = new ArrayList<>(); |
| |
| clientsByProtocolVersion.get(version).asMap().forEach((address, lastSeenTime) -> |
| result.add(new ClientStat(address, version, lastSeenTime))); |
| |
| return result; |
| } |
| |
| public void clear() |
| { |
| clientsByProtocolVersion.values().forEach(Cache::invalidateAll); |
| } |
| } |