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.
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:
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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
It's possible to have messenger pass additional data to the message handlerusing the HandlerArgumentsStamp.Add this stamp to the envelope in a middleware and fill it with any additionaldata you want to have available in the handler:
By default, each handler will be available to handle messages on allof your buses. To prevent dispatching a message to the wrong bus without an error,you can restrict each handler to a specific bus using the messenger.message_handler tag:
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.
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Competitive proposals will accelerate the progress in multi-messenger astrophysics and advance the community activities that have been developed during the initial five-year period of the WoU-MMA program. These build on observational and analysis capabilities at the intersection of the explorations enabled by each of the three windows. Efforts to integrate research communities to develop full interoperability between the three windows, and to develop a skilled new workforce in this field, are also encouraged. Proposals should be submitted to the relevant programs listed below (see Related Programs).
The WoU-MMA program is not intended to replace existing programs that make awards that involve experimental or theoretical efforts related to each of the three messengers. Rather, the WoU-MMA program is meant to fund awards that have significant components of multi-messenger astrophysics. Priority will be given to proposals for dedicated efforts that significantly advance the WoU-MMA goals. A proposal that is requesting consideration within the context of WoU-MMA should begin the title with the identifying acronym "WoU-MMA:". PIs should ask for consideration and review as a WoU-MMA proposal only if the proposal addresses at least one of the criteria listed above. Proposals marked for consideration by the WoU-MMA program that do not address at least one of these criteria will be reviewed solely within the participating program(s) to which they were submitted. Supplement requests to existing awards within a program that address one of the above criteria will also be considered.
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