cn.webfuse.framework.core.kit.concurrent.threadpool

类 QueuableCachedPool

java.lang.Object

java.util.concurrent.AbstractExecutorService

java.util.concurrent.ThreadPoolExecutor

cn.webfuse.framework.core.kit.concurrent.threadpool.QueuableCachedPool

所有已实现的接口:

Executor, ExecutorService

public final class QueuableCachedPool
extends ThreadPoolExecutor

copy from vipshop VJTools

From Tomcat 8.5.6, 传统的FixedThreadPool有Queue但线程数量不变，而CachedThreadPool线程数可变但没有Queue

Tomcat的线程池，通过控制TaskQueue，线程数，但线程数到达最大时会进入Queue中.

代码从Tomcat复制，主要修改包括：

1. 删除定期重启线程避免内存泄漏的功能，

2. TaskQueue中可能3次有锁的读取线程数量，改为只读取1次，这把锁也是这个实现里的唯一遗憾了。

https://github.com/apache/tomcat/blob/trunk/java/org/apache/tomcat/util/threads/ThreadPoolExecutor.java

嵌套类概要

嵌套类

限定符和类型	类和说明
protected static class	QueuableCachedPool.ControllableQueue https://github.com/apache/tomcat/blob/trunk/java/org/apache/tomcat/util/threads/TaskQueue.java

从类继承的嵌套类/接口 java.util.concurrent.ThreadPoolExecutor

ThreadPoolExecutor.AbortPolicy, ThreadPoolExecutor.CallerRunsPolicy, ThreadPoolExecutor.DiscardOldestPolicy, ThreadPoolExecutor.DiscardPolicy

构造器概要

构造器

构造器和说明
QueuableCachedPool(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, QueuableCachedPool.ControllableQueue workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler)

方法概要

限定符和类型	方法和说明
protected void	afterExecute(Runnable r, Throwable t)
void	execute(Runnable command)
void	execute(Runnable command, long timeout, TimeUnit unit) Executes the given command at some time in the future.
int	getSubmittedCount()

从类继承的方法 java.util.concurrent.ThreadPoolExecutor

allowCoreThreadTimeOut, allowsCoreThreadTimeOut, awaitTermination, beforeExecute, finalize, getActiveCount, getCompletedTaskCount, getCorePoolSize, getKeepAliveTime, getLargestPoolSize, getMaximumPoolSize, getPoolSize, getQueue, getRejectedExecutionHandler, getTaskCount, getThreadFactory, isShutdown, isTerminated, isTerminating, prestartAllCoreThreads, prestartCoreThread, purge, remove, setCorePoolSize, setKeepAliveTime, setMaximumPoolSize, setRejectedExecutionHandler, setThreadFactory, shutdown, shutdownNow, terminated, toString

从类继承的方法 java.util.concurrent.AbstractExecutorService

invokeAll, invokeAll, invokeAny, invokeAny, newTaskFor, newTaskFor, submit, submit, submit

从类继承的方法 java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造器详细资料

QueuableCachedPool

public QueuableCachedPool(int corePoolSize,
                          int maximumPoolSize,
                          long keepAliveTime,
                          TimeUnit unit,
                          QueuableCachedPool.ControllableQueue workQueue,
                          ThreadFactory threadFactory,
                          RejectedExecutionHandler handler)

方法详细资料

afterExecute

protected void afterExecute(Runnable r,
                            Throwable t)

覆盖:

afterExecute 在类中 ThreadPoolExecutor

getSubmittedCount

public int getSubmittedCount()

execute

public void execute(Runnable command)

指定者:

execute 在接口中 Executor

覆盖:

execute 在类中 ThreadPoolExecutor

execute

public void execute(Runnable command,
                    long timeout,
                    TimeUnit unit)

Executes the given command at some time in the future. The command may execute in a new thread, in a pooled thread, or in the calling thread, at the discretion of the Executor implementation. If no threads are available, it will be added to the work queue. If the work queue is full, the system will wait for the specified time and it throw a RejectedExecutionException if the queue is still full after that.

参数:

command - the runnable task

timeout - A timeout for the completion of the task

unit - The timeout time unit

抛出:

RejectedExecutionException - if this task cannot be accepted for execution - the queue is full

NullPointerException - if command or unit is null