Messenger Download Lite Apk
Susan Sabol
I'm just starting to use channel wires and was hoping to use them in projects. I've attached a very simple sample to use the multiple writer/reader capabilities that messenger channels were supposed to embody. If you run the VI, however, you'll notice that with this config (no acknowledgement, all terminals default values) the read instance that actually receives the change alternates between the two loops since, I guess, a messenger is after all a lossy buffer. I would have expected the data written in the event loop to be received at all read instances in light of the advertisement of messengers being a 'many-to-many communications channel'.
If the messenger is replaced with a tag channel, however, it does operate as expected, ie, each loop will see the changed value from the event loop, which is the way I want to eventually use it. The drawback here, though, is that continuous
reads (polling) are performed at the frequency specified by the timeout value. I guess I've misinterpreted the 'many-to-many' description of messenger channels in that single writer/multiple reader applications will not have simultaneous loop data refreshes. Can anyone please shed more light on this? Thanks in advance,
That was a lot of information! So it sounds like channel wires, especially messengers, are a work in progress. So if I understand correctly, you could assign IDs to the messages, and with a do loop, send the same message to each reader using different IDs? Hmmm...I'll give it a try and report back. Thanks again for your help.
The IMessenger interface is a contract for types that can be used to exchange messages between different objects. This can be useful to decouple different modules of an application without having to keep strong references to types being referenced. It is also possible to send messages to specific channels, uniquely identified by a token, and to have different messengers in different sections of an application. The MVVM Toolkit provides two implementations out of the box: WeakReferenceMessenger and StrongReferenceMessenger: the former uses weak references internally, offering automatic memory management for recipients, while the latter uses strong references and requires developers to manually unsubscribe their recipients when they're no longer needed (more details about how to unregister message handlers can be found below), but in exchange for that offers better performance and far less memory usage.
Both WeakReferenceMessenger and StrongReferenceMessenger also expose a Default property that offers a thread-safe implementation built-in into the package. It is also possible to create multiple messenger instances if needed, for instance if a different one is injected with a DI service provider into a different module of the app (for instance, multiple windows running in the same process).
Since the WeakReferenceMessenger type is simpler to use and matches the behavior of the messenger type from the MvvmLight library, it is the default type being used by the ObservableRecipient type in the MVVM Toolkit. The StrongReferenceType can still be used, by passing an instance to the constructor of that class.
Another useful feature of messenger instances is that they can also be used to request values from a module to another. In order to do so, the package includes a base RequestMessage class, which can be used like so:
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