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MESSENGER was a NASA robotic space probe that orbited the planet Mercury between 2011 and 2015, studying Mercury's chemical composition, geology, and magnetic field.[9][10] The name is a backronym for "Mercury Surface, Space Environment, Geochemistry, and Ranging", and a reference to the messenger god Mercury from Roman mythology.


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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:

Our messenger bags come in a range of sizes and styles. From ergonomic shoulder straps, to water resistant materials and convenient laptop sleeves, our messenger bags pack functionality into an ultra-durable design that will last for decades. Check out our messenger bag guide to learn more.

Can messenger bags be worn on the left and the right shoulder?The newest Chrome messenger bag, the Buran III, has an adjustable strap which allows it to be worn on the right or left shoulder. Many of our original messenger bags however, like the Citizen and Mini Metro, are left shoulder specific.

Supervisor is a great tool to guarantee that your worker process(es) isalways running (even if it closes due to failure, hitting a message limitor thanks to messenger:stop-workers). You can install it on Ubuntu, forexample, via:

Supervisor configuration files typically live in a /etc/supervisor/conf.ddirectory. For example, you can create a new messenger-worker.conf filethere to make sure that 2 instances of messenger:consume are running at alltimes:

If you use the Redis Transport, note that each worker needs a unique consumername to avoid the same message being handled by multiple workers. One way toachieve this is to set an environment variable in the Supervisor configurationfile, which you can then refer to in messenger.yaml(see the ref:`Redis section ` below):

Systemd user service configuration files typically live in a /.config/systemd/userdirectory. For example, you can create a new messenger-worker.service file. Or amessenger-worker@.service file if you want more instances running at the same time:

In this example, if handling a message fails 3 times (default max_retries),it will then be sent to the failed transport. While you can usemessenger:consume failed to consume this like a normal transport, you'llusually want to manually view the messages in the failure transport and chooseto retry them:

The consumers do not show up in an admin panel as this transport does not rely on\AmqpQueue::consume() which is blocking. Having a blocking receiver makesthe --time-limit/--memory-limit options of the messenger:consume command as well asthe messenger:stop-workers command inefficient, as they all rely on the fact thatthe receiver returns immediately no matter if it finds a message or not. The consumeworker is responsible for iterating until it receives a message to handle and/or until oneof the stop conditions is reached. Thus, the worker's stop logic cannot be reached if itis stuck in a blocking call.

There should never be more than one messenger:consume command running with the samecombination of stream, group and consumer, or messages could end up beinghandled more than once. If you run multiple queue workers, consumer can be set to anenvironment variable, like %env(MESSENGER_CONSUMER_NAME)%, set by Supervisor(example below) or any other service used to manage the worker processes.In a container environment, the HOSTNAME can be used as the consumer name, sincethere is only one worker per container/host. If using Kubernetes to orchestrate thecontainers, consider using a StatefulSet to have stable names.

The messenger.transport.symfony_serializer is a built-in service that usesthe Serializer component and can be configured in a few ways.If you do choose to use the Symfony serializer, you can control the contexton a case-by-case basis via the SerializerStamp(see Envelopes & Stamps).

Symfony will normally find and register your handler automatically.But, you can also configure a handler manually - and pass it some extra config -by tagging the handler service with messenger.message_handler

St Albans Messenger is a twice-weekly newspaper established in 1861 covering Franklin County, Vermont. publishes new content daily. Our beat reporters are on the ground covering local government, schools, sports, business and culture.

Love my new executive leather messenger in the grizzly leather. Excellent ordering expeerience with great correspondence while my bag was being made. Exceeded my expectations and perfect messenger bag for me to carry my laptop and belonging to and from the office and the hospital when rounding and seeing patients. Highly recommended and will consider future purchases as gifts.

I've discovered WaterField Designs some 5 years ago, while searching for a messenger bag for my MacBook. Since then I have purchased three excellent and really outstanding bags (too bad one of them was stolen). I can confidently say that their products are top-notch in terms of both quality and style. As Gary said to me (yep, I was lucky to meet him in person in his workshop in SF), I am probably the biggest fan of WaterField Designs in Bulgaria :)

Access, organization, expansion, and protection set this aesthetically beautiful bag far apart from run-of-the-mill messengers. Access via the 1-handed, secure MagLatch closure hardware, which adjusts to allow up to 6L of internal expansion.

The NOMATIC Messenger Bag is the perfect shoulder carry bag designed for everyday use. Each NOMATIC Messenger Bag includes two customizable panels, allowing you to decide what and how you pack. Our custom magnetic fidlock buckles give 360 degree rotation, and can be removed to carry like a briefcase. The magnetic water bottle pockets, full perimeter zipper, adjustable strap, and TSA-ready laptop compartment are just a few of the 20+ noteworthy features that make this bag the most functional messenger bag ever! 041b061a72


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