使用ExecutorCompletionService的PriorityExecutor,有可能吗?

时间:2015-01-09 13:58:13

标签: java concurrency completion-service

我已经实现了一个PriorityExecutor http://funofprograming.blogspot.co.il/2013/11/priorityexecutorservice-for-java.htmlSpecify task order execution in Java

但是,我想使用ExecutorCompletionService并将其PriorityExecutor

但是我得到以下的执行:

Caused by: java.lang.ClassCastException: java.util.concurrent.ExecutorCompletionService$QueueingFuture cannot be cast to java.lang.Comparable
    at java.util.concurrent.PriorityBlockingQueue.siftUpComparable(PriorityBlockingQueue.java:347)
    at java.util.concurrent.PriorityBlockingQueue.offer(PriorityBlockingQueue.java:479)
    at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1364)
    at java.util.concurrent.ExecutorCompletionService.submit(ExecutorCompletionService.java:188)
    at com.ibm.modmt.impl.sommosAlg.meta.PoolStrategy.multiSubmit(PoolStrategy.java:160)
    at com.ibm.modmt.impl.sommosAlg.meta.MultiSOMMOSTask.multiSubmit(MultiSOMMOSTask.java:157)
    at com.ibm.modmt.impl.sommosAlg.meta.MultiSOMMOSTask.call(MultiSOMMOSTask.java:85)
    at com.ibm.modmt.impl.sommosAlg.meta.MultiSOMMOSTask.call(MultiSOMMOSTask.java:1)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    ... 1 more

似乎完成服务从我的Comaprable Future中创建了自己的Future(QueueFuture)。

任何人都使用ExecutorCompletionService实现了PriorityExecutor? 如果是这样,我是否需要扩展ExecutorCompletionService?

1 个答案:

答案 0 :(得分:2)

我没有看到任何使用内置impl的方法。但是,ExecutorCompletionService是相当简单的代码并且是GPL,因此您可以将其复制以供自己使用并修改它以处理您的自定义Future。