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更改线程名称

为了简化日志读取和线程转储，可以自定义线程的名称。这可以通过创建ExecutorService时用一个ThreadFactory来完成。在流行的实用程序库中有许多ThreadFactory接口的实现:

com.google.common.util.concurrent.ThreadFactoryBuilde+r in Guava. 
org.springframework.scheduling.concurrent.CustomizableThreadFactory in Spring. 
org.apache.commons.lang3.concurrent.BasicThreadFactory in Apache Commons Lang 3.

ThreadFactory threadFactory = new BasicThreadFactory.Builder()
 .namingPattern("computation-thread-%d")
 .build();
ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads, threadFactory);

尽管ForkJoinPool不使用ThreadFactory接口，但也支持对线程的重命名:

ForkJoinPool.ForkJoinWorkerThreadFactory forkJoinThreadFactory = pool -> { 
 ForkJoinWorkerThread thread = ForkJoinPool.defaultForkJoinWorkerThreadFactory.newThread(pool); 
 thread.setName("computation-thread-" + thread.getPoolIndex()); 
 return thread;
};
ForkJoinPool forkJoinPool = new ForkJoinPool(numberOfThreads, forkJoinThreadFactory, null, false);

将线程转储与默认命名进行比较：

"pool-1-thread-3" #14 prio=5 os_prio=31 tid=0x00007fc06b19f000 nid=0x5703 runnable [0x0000700001ff9000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.TaskHandler.compute(TaskHandler.java:16)
...
"pool-2-thread-3" #15 prio=5 os_prio=31 tid=0x00007fc06aa10800 nid=0x5903 runnable [0x00007000020fc000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.HealthCheckCallback.recordFailure(HealthChecker.java:21)
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.HealthChecker.check(HealthChecker.java:9)
...
"pool-1-thread-2" #12 prio=5 os_prio=31 tid=0x00007fc06aa10000 nid=0x5303 runnable [0x0000700001df3000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.TaskHandler.compute(TaskHandler.java:16)
 ...

与自定义命名进行比较：

"task-handler-thread-1" #14 prio=5 os_prio=31 tid=0x00007fb49c9df000 nid=0x5703 runnable [0x000070000334a000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.TaskHandler.compute(TaskHandler.java:16)
...
"authentication-service-ping-thread-0" #15 prio=5 os_prio=31 tid=0x00007fb49c9de000 nid=0x5903 runnable [0x0000700003247000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.HealthCheckCallback.recordFailure(HealthChecker.java:21)
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.HealthChecker.check(HealthChecker.java:9)
...
"task-handler-thread-0" #12 prio=5 os_prio=31 tid=0x00007fb49b9b5000 nid=0x5303 runnable [0x0000700003144000]
 java.lang.Thread.State: RUNNABLE
at com.github.sorokinigor.article.tipsaboutconcurrency.setthreadsname.TaskHandler.compute(TaskHandler.java:16)
 ...

想象一下，可能会不止3个线程。

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