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https://github.com/BX-Team/DivineMC.git
synced 2025-12-28 11:19:19 +00:00
move patches to work
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@@ -1,191 +0,0 @@
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package com.ishland.flowsched.executor;
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import com.ishland.flowsched.structs.DynamicPriorityQueue;
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import com.ishland.flowsched.util.Assertions;
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import it.unimi.dsi.fastutil.objects.ReferenceArrayList;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.Executor;
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import java.util.function.Consumer;
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public class ExecutorManager {
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public final DynamicPriorityQueue<Task> globalWorkQueue;
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protected final ConcurrentMap<LockToken, FreeableTaskList> lockListeners = new ConcurrentHashMap<>();
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protected final WorkerThread[] workerThreads;
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final Object workerMonitor = new Object();
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/**
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* Creates a new executor manager.
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*
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* @param workerThreadCount the number of worker threads.
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*/
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public ExecutorManager(int workerThreadCount) {
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this(workerThreadCount, thread -> { });
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}
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/**
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* Creates a new executor manager.
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*
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* @param workerThreadCount the number of worker threads.
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* @param threadInitializer the thread initializer.
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*/
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public ExecutorManager(int workerThreadCount, Consumer<Thread> threadInitializer) {
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globalWorkQueue = new DynamicPriorityQueue<>();
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workerThreads = new WorkerThread[workerThreadCount];
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for (int i = 0; i < workerThreadCount; i++) {
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final WorkerThread thread = new WorkerThread(this);
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threadInitializer.accept(thread);
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thread.start();
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workerThreads[i] = thread;
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}
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}
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/**
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* Attempt to lock the given tokens.
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* The caller should discard the task if this method returns false, as it reschedules the task.
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*
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* @return {@code true} if the lock is acquired, {@code false} otherwise.
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*/
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boolean tryLock(Task task) {
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retry:
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while (true) {
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final FreeableTaskList listenerSet = new FreeableTaskList();
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LockToken[] lockTokens = task.lockTokens();
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for (int i = 0; i < lockTokens.length; i++) {
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LockToken token = lockTokens[i];
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final FreeableTaskList present = this.lockListeners.putIfAbsent(token, listenerSet);
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if (present != null) {
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for (int j = 0; j < i; j++) {
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this.lockListeners.remove(lockTokens[j], listenerSet);
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}
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callListeners(listenerSet);
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synchronized (present) {
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if (present.freed) {
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continue retry;
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} else {
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present.add(task);
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}
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}
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return false;
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}
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}
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return true;
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}
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}
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/**
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* Release the locks held by the given task.
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*
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* @param task the task.
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*/
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void releaseLocks(Task task) {
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FreeableTaskList expectedListeners = null;
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for (LockToken token : task.lockTokens()) {
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final FreeableTaskList listeners = this.lockListeners.remove(token);
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if (listeners != null) {
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if (expectedListeners == null) {
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expectedListeners = listeners;
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} else {
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Assertions.assertTrue(expectedListeners == listeners, "Inconsistent lock listeners");
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}
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} else {
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throw new IllegalStateException("Lock token " + token + " is not locked");
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}
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}
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if (expectedListeners != null) {
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callListeners(expectedListeners); // synchronizes
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}
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}
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private void callListeners(FreeableTaskList listeners) {
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synchronized (listeners) {
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listeners.freed = true;
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if (listeners.isEmpty()) return;
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for (Task listener : listeners) {
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this.schedule0(listener);
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}
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}
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this.wakeup();
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}
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/**
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* Polls an executable task from the global work queue.
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*
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* @return the task, or {@code null} if no task is executable.
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*/
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Task pollExecutableTask() {
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Task task;
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while ((task = this.globalWorkQueue.dequeue()) != null) {
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if (this.tryLock(task)) {
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return task;
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}
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}
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return null;
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}
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/**
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* Shuts down the executor manager.
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*/
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public void shutdown() {
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for (WorkerThread workerThread : workerThreads) {
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workerThread.shutdown();
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}
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}
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/**
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* Schedules a task.
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*
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* @param task the task.
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*/
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public void schedule(Task task) {
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schedule0(task);
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wakeup();
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}
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private void schedule0(Task task) {
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this.globalWorkQueue.enqueue(task, task.priority());
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}
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public void wakeup() { // Canvas - private -> public
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synchronized (this.workerMonitor) {
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this.workerMonitor.notify();
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}
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}
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public boolean hasPendingTasks() {
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return this.globalWorkQueue.size() != 0;
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}
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/**
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* Schedules a runnable for execution with the given priority.
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*
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* @param runnable the runnable.
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* @param priority the priority.
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*/
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public void schedule(Runnable runnable, int priority) {
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this.schedule(new SimpleTask(runnable, priority));
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}
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/**
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* Creates an executor that schedules runnables with the given priority.
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*
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* @param priority the priority.
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* @return the executor.
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*/
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public Executor executor(int priority) {
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return runnable -> this.schedule(runnable, priority);
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}
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/**
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* Notifies the executor manager that the priority of the given task has changed.
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*
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* @param task the task.
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*/
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public void notifyPriorityChange(Task task) {
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this.globalWorkQueue.changePriority(task, task.priority());
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}
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protected static class FreeableTaskList extends ReferenceArrayList<Task> { // Canvas - private -> protected
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private boolean freed = false;
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}
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}
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@@ -1,3 +0,0 @@
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package com.ishland.flowsched.executor;
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public interface LockToken { }
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@@ -1,37 +0,0 @@
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package com.ishland.flowsched.executor;
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import java.util.Objects;
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public class SimpleTask implements Task {
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private final Runnable wrapped;
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private final int priority;
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public SimpleTask(Runnable wrapped, int priority) {
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this.wrapped = Objects.requireNonNull(wrapped);
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this.priority = priority;
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}
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@Override
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public void run(Runnable releaseLocks) {
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try {
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wrapped.run();
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} finally {
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releaseLocks.run();
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}
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}
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@Override
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public void propagateException(Throwable t) {
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t.printStackTrace();
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}
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@Override
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public LockToken[] lockTokens() {
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return new LockToken[0];
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}
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@Override
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public int priority() {
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return this.priority;
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}
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}
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@@ -1,11 +0,0 @@
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package com.ishland.flowsched.executor;
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public interface Task {
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void run(Runnable releaseLocks);
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void propagateException(Throwable t);
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LockToken[] lockTokens();
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int priority();
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}
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@@ -1,84 +0,0 @@
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package com.ishland.flowsched.executor;
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import ca.spottedleaf.moonrise.common.util.TickThread;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.locks.LockSupport;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class WorkerThread extends TickThread {
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private static final Logger LOGGER = LoggerFactory.getLogger("FlowSched Executor Worker Thread");
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private final ExecutorManager executorManager;
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private final AtomicBoolean shutdown = new AtomicBoolean(false);
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public volatile boolean active = false;
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public WorkerThread(ExecutorManager executorManager) {
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super("null_worker");
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this.executorManager = executorManager;
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}
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@Override
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public void run() {
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main_loop:
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while (true) {
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if (this.shutdown.get()) {
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return;
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}
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active = true;
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if (pollTasks()) {
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continue;
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}
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synchronized (this.executorManager.workerMonitor) {
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if (this.executorManager.hasPendingTasks()) continue main_loop;
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try {
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active = false;
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this.executorManager.workerMonitor.wait();
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} catch (InterruptedException ignored) {
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}
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}
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}
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}
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private boolean pollTasks() {
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final Task task = executorManager.pollExecutableTask();
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try {
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if (task != null) {
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AtomicBoolean released = new AtomicBoolean(false);
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try {
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task.run(() -> {
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if (released.compareAndSet(false, true)) {
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executorManager.releaseLocks(task);
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}
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});
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} catch (Throwable t) {
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try {
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if (released.compareAndSet(false, true)) {
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executorManager.releaseLocks(task);
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}
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} catch (Throwable t1) {
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t.addSuppressed(t1);
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LOGGER.error("Exception thrown while releasing locks", t);
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}
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try {
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task.propagateException(t);
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} catch (Throwable t1) {
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t.addSuppressed(t1);
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LOGGER.error("Exception thrown while propagating exception", t);
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}
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}
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return true;
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}
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return false;
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} catch (Throwable t) {
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LOGGER.error("Exception thrown while executing task", t);
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return true;
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}
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}
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public void shutdown() {
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shutdown.set(true);
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LockSupport.unpark(this);
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}
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}
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@@ -1,86 +0,0 @@
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package com.ishland.flowsched.structs;
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import ca.spottedleaf.moonrise.common.util.MoonriseConstants;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import java.util.concurrent.atomic.AtomicIntegerArray;
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@SuppressWarnings("unchecked")
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public class DynamicPriorityQueue<E> {
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public static final int MAX_PRIORITY = MoonriseConstants.MAX_VIEW_DISTANCE + 3;
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private final AtomicIntegerArray taskCount;
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public final ConcurrentLinkedQueue<E>[] priorities;
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private final ConcurrentHashMap<E, Integer> priorityMap = new ConcurrentHashMap<>();
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public DynamicPriorityQueue() {
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this.taskCount = new AtomicIntegerArray(MAX_PRIORITY);
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this.priorities = new ConcurrentLinkedQueue[MAX_PRIORITY];
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for (int i = 0; i < (MAX_PRIORITY); i++) {
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this.priorities[i] = new ConcurrentLinkedQueue<>();
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}
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}
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public void enqueue(E element, int priority) {
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if (this.priorityMap.putIfAbsent(element, priority) != null)
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throw new IllegalArgumentException("Element already in queue");
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this.priorities[priority].add(element);
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this.taskCount.incrementAndGet(priority);
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}
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public boolean changePriority(E element, int newPriority) {
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Integer currentPriority = this.priorityMap.get(element);
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if (currentPriority == null || currentPriority == newPriority) {
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return false;
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}
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int currentIndex = currentPriority;
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boolean removedFromQueue = this.priorities[currentIndex].remove(element);
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if (!removedFromQueue) {
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return false;
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}
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this.taskCount.decrementAndGet(currentIndex);
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final boolean changeSuccess = this.priorityMap.replace(element, currentPriority, newPriority);
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if (!changeSuccess) {
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return false;
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}
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this.priorities[newPriority].add(element);
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this.taskCount.incrementAndGet(newPriority);
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return true;
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}
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public E dequeue() {
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for (int i = 0; i < this.priorities.length; i++) {
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if (this.taskCount.get(i) == 0) continue;
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E element = priorities[i].poll();
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if (element != null) {
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this.taskCount.decrementAndGet(i);
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this.priorityMap.remove(element);
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return element;
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}
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}
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return null;
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}
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public boolean contains(E element) {
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return priorityMap.containsKey(element);
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}
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public void remove(E element) {
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Integer priority = this.priorityMap.remove(element);
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if (priority == null) return;
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boolean removed = this.priorities[priority].remove(element);
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if (removed) this.taskCount.decrementAndGet(priority);
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}
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public int size() {
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return priorityMap.size();
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}
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public boolean isEmpty() {
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return size() == 0;
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}
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}
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@@ -1,27 +0,0 @@
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package com.ishland.flowsched.util;
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public final class Assertions {
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public static void assertTrue(boolean value, String message) {
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if (!value) {
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final AssertionError error = new AssertionError(message);
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error.printStackTrace();
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throw error;
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}
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}
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public static void assertTrue(boolean state, String format, Object... args) {
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if (!state) {
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final AssertionError error = new AssertionError(String.format(format, args));
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error.printStackTrace();
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throw error;
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}
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}
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public static void assertTrue(boolean value) {
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if (!value) {
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final AssertionError error = new AssertionError();
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error.printStackTrace();
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throw error;
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}
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}
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}
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