| /* |
| * 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.flink.statefun.examples.ridesharing.simulator.simulation.engine; |
| |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import javax.annotation.Nullable; |
| import org.springframework.stereotype.Component; |
| |
| @Component |
| public class Scheduler { |
| |
| private static final int THREAD_COUNT = 4; |
| |
| private final AtomicBoolean started = new AtomicBoolean(false); |
| |
| private final ConcurrentHashMap<String, Task> tasks = new ConcurrentHashMap<>(); |
| |
| private final Executor eventLoopExecutor = |
| Executors.newFixedThreadPool(THREAD_COUNT, DaemonThreadFactory.INSTANCE); |
| |
| private final EventLoop[] eventLoops = new EventLoop[THREAD_COUNT]; |
| |
| public boolean start() { |
| if (!started.compareAndSet(false, true)) { |
| return false; |
| } |
| for (int i = 0; i < THREAD_COUNT; i++) { |
| EventLoop eventLoop = new EventLoop(tasks); |
| eventLoops[i] = eventLoop; |
| eventLoopExecutor.execute(eventLoop); |
| } |
| return true; |
| } |
| |
| public void add(Simulatee simulatee) { |
| Objects.requireNonNull(simulatee); |
| |
| Task task = new Task(simulatee); |
| task.enqueue(LifecycleMessages.initialization()); |
| |
| tasks.put(task.id(), task); |
| |
| eventLoopFor(task).addToReadySet(task); |
| } |
| |
| public void enqueueTaskMessage(String simulateeId, Object message) { |
| Objects.requireNonNull(simulateeId); |
| Objects.requireNonNull(message); |
| |
| final @Nullable Task task = tasks.get(simulateeId); |
| if (task == null) { |
| return; |
| } |
| task.enqueue(message); |
| eventLoopFor(task).addToReadySet(task); |
| } |
| |
| private EventLoop eventLoopFor(Task task) { |
| return eventLoops[partition(task)]; |
| } |
| |
| private static int partition(Task task) { |
| Objects.requireNonNull(task); |
| return Math.abs(task.id().hashCode()) % THREAD_COUNT; |
| } |
| } |