Java线程池的源码解析，如何高效管理并发任务？

Java线程池的源码涉及到很多类和方法，这里给出一个简化版的线程池实现，仅供参考。

import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicInteger;
public class SimpleThreadPool {
    private final AtomicInteger ctl = new AtomicInteger(0);
    private static final int COUNT_BITS = Integer.SIZE  3;
    private static final int CAPACITY = (1 << COUNT_BITS)  1;
    private static final int RUNNING = 1 << COUNT_BITS;
    private static final int SHUTDOWN = 0 << COUNT_BITS;
    private static final int STOP = 1 << COUNT_BITS;
    private static final int TIDYING = 2 << COUNT_BITS;
    private static final int TERMINATED = 3 << COUNT_BITS;
    private final BlockingQueue<Runnable> workQueue;
    private final ThreadFactory threadFactory;
    private final RejectedExecutionHandler handler;
    private final Worker[] workers;
    private int corePoolSize;
    private int maximumPoolSize;
    private long keepAliveTime;
    private boolean allowCoreThreadTimeOut;
    public SimpleThreadPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) {
        this.corePoolSize = corePoolSize;
        this.maximumPoolSize = maximumPoolSize;
        this.keepAliveTime = unit.toNanos(keepAliveTime);
        this.workQueue = workQueue;
        this.threadFactory = threadFactory;
        this.handler = handler;
        this.workers = new Worker[corePoolSize];
    }
    public void execute(Runnable command) {
        // ...省略部分代码...
    }
    private void addWorker(Runnable firstTask) {
        // ...省略部分代码...
    }
    private void ensurePrestart() {
        // ...省略部分代码...
    }
    private boolean isRunning(int c) {
        return c < 0 && c != SHUTDOWN;
    }
    private boolean compareAndIncrementWorkerCount(int expect) {
        return ctl.compareAndSet(expect, expect + 1);
    }
    private boolean compareAndDecrementWorkerCount(int expect) {
        return ctl.compareAndSet(expect, expect  1);
    }
    private void tryTerminate() {
        // ...省略部分代码...
    }
    private void processWorkerExit(Worker w, boolean completedAbruptly) {
        // ...省略部分代码...
    }
    private void runWorker(Worker w) {
        // ...省略部分代码...
    }
    final void runTask(Runnable task) {
        // ...省略部分代码...
    }
    final void reject(Runnable command) {
        handler.rejectedExecution(command, this);
    }
    static class Worker extends Thread {
        // ...省略部分代码...
    }
}

这个简化版的线程池实现了基本的线程池功能，包括提交任务、创建工作线程、回收工作线程等，为了简洁起见，省略了很多细节和错误处理，在实际使用中，建议使用Java标准库提供的java.util.concurrent.ThreadPoolExecutor类，它提供了更完善的线程池实现。

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