SimpleTaskQueueWithHistory is not thread safe
---------------------------------------------
Key: DROIDS-166
URL: https://issues.apache.org/jira/browse/DROIDS-166
Project: Droids
Issue Type: Bug
Components: core
Affects Versions: 0.0.2
Reporter: Tobias Rübner
Fix For: 0.0.2
The implementation extends java.util.LinkedList which is not thread safe.
Running droids with the MultiThreadedTaskMaster could spawn endless new threads.
{code}
Exception in thread "pool-1-thread-12808" java.util.NoSuchElementException
at java.util.LinkedList.remove(LinkedList.java:788)
at java.util.LinkedList.removeFirst(LinkedList.java:134)
at java.util.LinkedList.poll(LinkedList.java:470)
at
org.apache.droids.impl.MultiThreadedTaskMaster$TaskExecutor.run(MultiThreadedTaskMaster.java:336)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
{code}
I fixed this extending the SimpleTaskQueueWithHistory from
java.util.concurrent.LinkedBlockingQueue and rewriting the add and offer
methods.
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