logback-android/src/main/java/ch/qos/logback/core/util/ExecutorServiceUtil.java
static public ExecutorService newExecutorService() {
    return new ThreadPoolExecutor(CoreConstants.CORE_POOL_SIZE,
        CoreConstants.MAX_POOL_SIZE,
        0L, TimeUnit.MILLISECONDS,
        new SynchronousQueue<Runnable>(),
        THREAD_FACTORY);
  }
static public ExecutorService newExecutorService() {
    return new ThreadPoolExecutor(CoreConstants.CORE_POOL_SIZE,
        CoreConstants.MAX_POOL_SIZE,
        0L, TimeUnit.MILLISECONDS,
        new SynchronousQueue<Runnable>(),
        THREAD_FACTORY);
  }
Creates an executor service suitable for use by logback components.
@return executor service