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注意requestattributes這個字段，是解決問題的關鍵所在

@slf4j

public class taskrunnable implements runnable 
public taskrunnable(string name, runnable runnable, requestattributes requestattributes) 
@override
public void run() 
if (requestattributes != null) 
runnable.run();
} finally 
mdcutils.clear();}}
}

@slf4j

public class taskcallableimplements callable 
public taskcallable(string name, callablecallable, requestattributes requestattributes) 
@override
public t call() throws exception 
if (requestattributes != null) 
return callable.call();
} finally 
mdcutils.clear();}}
}

public class taskthreadpoolexecutor extends threadpoolexecutor 

public taskthreadpoolexecutor(int corepoolsize, int maximumpoolsize, long keepalivetime, timeunit unit,
blockingqueueworkqueue, threadfactory threadfactory) 
public taskthreadpoolexecutor(int corepoolsize, int maximumpoolsize, long keepalivetime, timeunit unit,
blockingqueueworkqueue, rejectedexecutionhandler handler) 
public taskthreadpoolexecutor(int corepoolsize, int maximumpoolsize, long keepalivetime, timeunit unit,
blockingqueueworkqueue, threadfactory threadfactory,
rejectedexecutionhandler handler) 
@override
public void execute(runnable command) else 
}}

private static final executorservice executorservice = new taskthreadpoolexecutor(20, 200,

200l, timeunit.seconds,
new linkedblockingqueue(5000), new threadfactory() 
}, new threadpoolexecutor.abortpolicy());

completablefuturefuture1 = completablefuture.supplyasync(() -> get***service(), executorservice);

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