Thrift threadmanager and three monitors

Catalog

One 、ThreadManager

Two 、 Three Monitor

(1) monitor_

(2) workerMonitor_

(3) maxMonitor_

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One 、ThreadManager

effect ： Thread pool management class , Create a thread with a thread factory

characteristic ： Threads will not be created or destroyed , Instead, save the number of idle threads variable 、 Active threads variable ;

Maintain a task （task） queue , And balance the response and waiting time of the service , Notify the thread pool policy object （PoolPolicy object ） Relevant information , from PoolPolicy object Determine pool sizing , The advantage of this is that the strategy can be decoupled .

Two 、 Three Monitor

(1) monitor_

To coordinate task Fast execution , Join the slow situation , When one worker Finish one task, It will start from tasks Get another one in , If not , Just block ; When new task Add to tasks perhaps worker When cleaned ,monitor_ Wake up again .

(2) workerMonitor_

Every worker Run out task Will be added to deadWorkers_ Inside ,addWorker and removeWorker Will not change workCount_, It will only change workMaxCount_, Only when run When it's time to change manager_ Of workerCount_, Synchronization is by workerMonitor_ be responsible for .

(3) maxMonitor_

Used to monitor waiting task number , When manager_ call add add to task when , If the maximum has been exceeded , Will wait , Wait until call worker Of run Method , Remove... From the task queue task after , When the task queue length is less than the maximum , Wake up again .