Synchronization is particularly useful in the implementation phase of services.
同步在服务的实现阶段特别有用。
The Barrier class is used to create synchronization points for multi-phase operations.
Barrier类的作用是在多个阶段的操作之间创建同步点。
Unlike Phasers, however, CyclicBarriers do not support the dynamic addition or removal of threads; nor do they support one-way synchronization or split-phase operation.
然而它并不能像Phasers那样做到线程的动态添加和移除，以及单向同步和分相操作。
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