| /* |
| * 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.simulator.systems; |
| |
| import java.net.InetSocketAddress; |
| import java.util.Collections; |
| import java.util.IdentityHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| import java.util.function.Consumer; |
| import java.util.function.Function; |
| |
| import org.apache.cassandra.distributed.Cluster; |
| import org.apache.cassandra.gms.FailureDetector; |
| import org.apache.cassandra.gms.IFailureDetectionEventListener; |
| import org.apache.cassandra.gms.IFailureDetector; |
| import org.apache.cassandra.locator.InetAddressAndPort; |
| |
| public class SimulatedFailureDetector |
| { |
| public static class Instance implements IFailureDetector |
| { |
| private static volatile FailureDetector wrapped; |
| |
| private static volatile Function<InetSocketAddress, Boolean> OVERRIDE; |
| private static final Map<IFailureDetectionEventListener, Boolean> LISTENERS = Collections.synchronizedMap(new IdentityHashMap<>()); |
| |
| private static FailureDetector wrapped() |
| { |
| FailureDetector detector = wrapped; |
| if (detector == null) |
| { |
| synchronized (LISTENERS) |
| { |
| if (wrapped == null) |
| wrapped = new FailureDetector(); |
| } |
| detector = wrapped; |
| } |
| return detector; |
| } |
| |
| private Boolean override(InetAddressAndPort ep) |
| { |
| Function<InetSocketAddress, Boolean> overrideF = OVERRIDE; |
| return overrideF == null ? null : overrideF.apply(new InetSocketAddress(ep.getAddress(), ep.getPort())); |
| } |
| |
| public boolean isAlive(InetAddressAndPort ep) |
| { |
| Boolean override = override(ep); |
| return override != null ? override : wrapped().isAlive(ep); |
| } |
| |
| public void interpret(InetAddressAndPort ep) |
| { |
| wrapped().interpret(ep); |
| } |
| |
| public void report(InetAddressAndPort ep) |
| { |
| wrapped().report(ep); |
| } |
| |
| public void remove(InetAddressAndPort ep) |
| { |
| wrapped().remove(ep); |
| } |
| |
| public void forceConviction(InetAddressAndPort ep) |
| { |
| wrapped().forceConviction(ep); |
| } |
| |
| public void registerFailureDetectionEventListener(IFailureDetectionEventListener listener) |
| { |
| LISTENERS.put(listener, Boolean.TRUE); |
| } |
| |
| public void unregisterFailureDetectionEventListener(IFailureDetectionEventListener listener) |
| { |
| LISTENERS.remove(listener); |
| } |
| |
| synchronized static void setup(Function<InetSocketAddress, Boolean> override, Consumer<Consumer<InetSocketAddress>> register) |
| { |
| OVERRIDE = override; |
| register.accept(ep -> LISTENERS.keySet().forEach(c -> c.convict(InetAddressAndPort.getByAddress(ep), Double.MAX_VALUE))); |
| } |
| } |
| |
| final List<Consumer<InetSocketAddress>> listeners = new CopyOnWriteArrayList<>(); |
| final Map<InetSocketAddress, Boolean> override = new ConcurrentHashMap<>(); |
| |
| public SimulatedFailureDetector(Cluster cluster) |
| { |
| cluster.forEach(i -> i.unsafeAcceptOnThisThread(Instance::setup, |
| override::get, |
| consumer -> listeners.add(e -> i.unsafeAcceptOnThisThread(Consumer::accept, consumer, e))) |
| ); |
| } |
| |
| public void markDown(InetSocketAddress address) |
| { |
| override.put(address, Boolean.FALSE); |
| listeners.forEach(c -> c.accept(address)); |
| } |
| } |