szetszwo commented on PR #955:
URL: https://github.com/apache/ratis/pull/955#issuecomment-1784208441
Another way is to use `CompletableFuture` as below. It may be easier to
understand.
```java
private static final
AtomicReference<CompletableFuture<ReferenceCountedObject<EventLoopGroup>>>
SHARED_WORKER_GROUP
= new AtomicReference<>();
static WorkerGroupGetter newInstance(RaftProperties properties) {
final boolean shared =
NettyConfigKeys.DataStream.Client.workerGroupShare(properties);
if (shared) {
final CompletableFuture<ReferenceCountedObject<EventLoopGroup>>
created = new CompletableFuture<>();
final CompletableFuture<ReferenceCountedObject<EventLoopGroup>>
current
= SHARED_WORKER_GROUP.updateAndGet(g -> g != null ? g : created);
if (current == created) {
created.complete(ReferenceCountedObject.wrap(newWorkerGroup(properties)));
}
return new WorkerGroupGetter(current.join().retain()) {
@Override
void shutdownGracefully() {
final CompletableFuture<ReferenceCountedObject<EventLoopGroup>>
returned
= SHARED_WORKER_GROUP.updateAndGet(previous -> {
Preconditions.assertSame(current, previous,
"SHARED_WORKER_GROUP");
return previous.join().release() ? null : previous;
});
if (returned == null) {
workerGroup.shutdownGracefully();
}
}
};
} else {
return new WorkerGroupGetter(newWorkerGroup(properties));
}
}
```
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