Commonly used types from xtra
| Address | An Address is a reference to an actor through which Messages can be
sent. It can be cloned, and when all Addresses are dropped, the actor will be stopped. Therefore,
any existing Addresses will inhibit the dropping of an actor. If this is undesirable, then
the WeakAddress struct should be used instead. This struct is created
by calling the Actor::create or Actor::spawn
methods.
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| Context | Context is used to control how the actor is managed and to get the actor's address from inside
of a message handler.
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| MessageChannel | A message channel is a channel through which you can send only one kind of message, but to
any actor that can handle it. It is like Address, but associated with
the message type rather than the actor type. Any existing MessageChannels will prevent the
dropping of the actor. If this is undesirable, then the WeakMessageChannel
struct should be used instead. This struct is created by calling
Address::channel,
Address::into_channel, or the similar methods on
WeakAddress.
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| AddressExt | General trait for any kind of address to an actor, be it strong or weak. This trait contains all
functions of the address.
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| MessageChannelExt | General trait for any kind of channel of messages, be it strong or weak. This trait contains all
functions of the channel.
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