我正在使用ReentrantLock及其推荐的做法(锁定,然后将实际代码放入try-block中,然后最后进行解锁,请参见下面的代码示例)。有时(非常罕见)我在解锁期间遇到java.lang.IllegalMonitorStateException异常。为什么会发生?也许它与Android的Java VM实现有关。
错误:
java.lang.IllegalMonitorStateException
java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:126)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1232)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:430)
at com.example.dummy.backend.model.Model.unlock(Model.java:283)
at com.example.dummy.backend.engine.Engine.removeOldInstances(Engine.java:712)
at com.example.dummy.backend.engine.Engine$ProcessOnResumeWorkInBackground.doInBackground(Engine.java:836)
at com.example.dummy.backend.engine.Engine$ProcessOnResumeWorkInBackground.doInBackground(Engine.java:790)
at android.os.AsyncTask$2.call(AsyncTask.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
at java.lang.Thread.run(Thread.java:1019)
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代码示例(略有简化):
myLock.lock();
try {
LinkedList<MyClass> myClassInstances = model.getMyClassInstances();
Iterator<MyClass> iterator = myClassInstances.iterator();
while (iterator.hasNext()) {
MyClass myClassInstance = iterator.next();
boolean toBeRemoved = true; // simple condition here
if (toBeRemoved) {
logger.info("Removing old myClassInstance " + myClassInstance.getTimestamp());
iterator.remove();
Cache.removeMyClassByCodeAndTimestamp(myClassInstance);
}
}
} finally {
myLock.unlock();
}
Run Code Online (Sandbox Code Playgroud) 是否可以制作其中一种jedi.el
或anaconda-mode
完整的基类方法?例如,当子类化时,html.parser.HTMLParser
我希望它在点完成以下代码(1)
(基类有类似handle_data
或的方法handle_starttag
):
import html.parser
class MyParser(html.parser.HTMLParser):
def handle_ # (1)
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