7971a252a5
Motivation: The generics for the existing futures, promises, and listeners are too complicated. This complication comes from the existence of `ChannelPromise` and `ChannelFuture`, which forces listeners to care about the particular _type_ of future being listened on. Modification: * Add a `FutureContextListener` which can take a context object as an additional argument. This allows our listeners to have the channel piped through to them, so they don't need to rely on the `ChannelFuture.channel()` method. * Make the `FutureListener`, along with the `FutureContextListener` sibling, the default listener API, retiring the `GenericFutureListener` since we no longer need to abstract over the type of the future. * Change all uses of `ChannelPromise` to `Promise<Void>`. * Change all uses of `ChannelFuture` to `Future<Void>`. * Change all uses of `GenericFutureListener` to either `FutureListener` or `FutureContextListener` as needed. * Remove `ChannelFutureListener` and `GenericFutureListener`. * Introduce a `ChannelFutureListeners` enum to house the constants that previously lived in `ChannelFutureListener`. These constants now implement `FutureContextListener` and take the `Channel` as a context. * Remove `ChannelPromise` and `ChannelFuture` — all usages now rely on the plain `Future` and `Promise` APIs. * Add static factory methods to `DefaultPromise` that allow us to create promises that are initialised as successful or failed. * Remove `CompleteFuture`, `SucceededFuture`, `FailedFuture`, `CompleteChannelFuture`, `SucceededChannelFuture`, and `FailedChannelFuture`. * Remove `ChannelPromiseNotifier`. Result: Cleaner generics and more straight forward code. |
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