95 lines
3.9 KiB
Java
95 lines
3.9 KiB
Java
/*
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* SPDX-License-Identifier: MIT
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015-2021 <Your name and contributors>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package com.github.games647.fastlogin.core;
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import com.google.common.util.concurrent.MoreExecutors;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.LinkedBlockingQueue;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.ThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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import org.slf4j.Logger;
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/**
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* This limits the number of threads that are used at maximum. Thread creation can be very heavy for the CPU and
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* context switching between threads too. However we need many threads for blocking HTTP and database calls.
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* Nevertheless this number can be further limited, because the number of actually working database threads
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* is limited by the size of our database pool. The goal is to separate concerns into processing and blocking only
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* threads.
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*/
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public class AsyncScheduler {
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private static final int MAX_CAPACITY = 1024;
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//todo: single thread for delaying and scheduling tasks
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private final Logger logger;
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// 30 threads are still too many - the optimal solution is to separate into processing and blocking threads
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// where processing threads could only be max number of cores while blocking threads could be minimized using
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// non-blocking I/O and a single event executor
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private final ExecutorService processingPool;
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/*
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private final ExecutorService databaseExecutor = new ThreadPoolExecutor(1, 10,
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0L, TimeUnit.MILLISECONDS,
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new LinkedBlockingQueue<>(MAX_CAPACITY));
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*/
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public AsyncScheduler(Logger logger, ThreadFactory threadFactory) {
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this.logger = logger;
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processingPool = new ThreadPoolExecutor(6, 32,
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60L, TimeUnit.SECONDS,
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new LinkedBlockingQueue<>(MAX_CAPACITY), threadFactory);
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}
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/*
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public <R> CompletableFuture<R> runDatabaseTask(Supplier<R> databaseTask) {
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return CompletableFuture.supplyAsync(databaseTask, databaseExecutor)
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.exceptionally(error -> {
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logger.warn("Error occurred on thread pool", error);
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return null;
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})
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// change context to the processing pool
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.thenApplyAsync(r -> r, processingPool);
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}
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*/
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public CompletableFuture<Void> runAsync(Runnable task) {
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return CompletableFuture.runAsync(task, processingPool).exceptionally(error -> {
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logger.warn("Error occurred on thread pool", error);
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return null;
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});
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}
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public void shutdown() {
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MoreExecutors.shutdownAndAwaitTermination(processingPool, 1, TimeUnit.MINUTES);
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//MoreExecutors.shutdownAndAwaitTermination(databaseExecutor, 1, TimeUnit.MINUTES);
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}
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}
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