Download the PHP package phpgears/cqrs-async without Composer
On this page you can find all versions of the php package phpgears/cqrs-async. It is possible to download/install these versions without Composer. Possible dependencies are resolved automatically.
Download phpgears/cqrs-async
More information about phpgears/cqrs-async
Files in phpgears/cqrs-async
Package cqrs-async
Short Description Async CQRS
License MIT
Homepage https://github.com/phpgears/cqrs-async
FAQ
Example:
In general, it is recommended to use always a project to download your libraries. In an application normally there is more than one library needed.
- Some hosting areas are not accessible by a terminal or SSH. Then it is not possible to use Composer.
- To use Composer is sometimes complicated. Especially for beginners.
- Composer needs much resources. Sometimes they are not available on a simple webspace.
- If you are using private repositories you don't need to share your credentials. You can set up everything on our site and then you provide a simple download link to your team member.
- Simplify your Composer build process. Use our own command line tool to download the vendor folder as binary. This makes your build process faster and you don't need to expose your credentials for private repositories.
Informations about the package cqrs-async
Async CQRS
Async decorator for CQRS command bus
Installation
Composer
Usage
Require composer autoload file
Asynchronous Commands Bus
Command bus decorator to handle commands asynchronously
Enqueue
Dequeue
This part is highly dependent on your message queue, though command serializers can be used to deserialize queue message
This is just an example of the process
Deserialized commands should be wrapped in Gears\CQRS\Async\ReceivedCommand in order to avoid infinite loops should you decide to handle the commands to an async command bus. If you decide to use a non-async bus on the dequeue side you don't need to do this
Discriminator
Discriminates whether a command should or should not be enqueued based on arbitrary conditions
Three discriminators are provided in this package
Gears\CQRS\Async\Discriminator\ArrayCommandDiscriminatorselects commands if they are present in the array providedGears\CQRS\Async\Discriminator\ClassCommandDiscriminatorselects commands by their class or interfaceGears\CQRS\Async\Discriminator\ParameterCommandDiscriminatorselects commands by the presence of a command payload parameter (optionally by its value as well)
Command queue
This is the one responsible for actual async handling, which would normally be sending the serialized command to a message queue system such as RabbitMQ
No implementation is provided but an abstract base class so you can extend from it
You can use cqrs-async-queue-interop that uses queue-interop for enqueuing messages
Serializer
Abstract command queue uses serializers to do command serialization so it can be sent to the message queue as a string message
Gears\CQRS\Async\Serializer\JsonCommandSerializer is directly provided as a general serializer allowing maximum compatibility in case of commands being handled by other systems
You can create your own serializer if the one provided does not fit your needs, for example by using JMS serializer, by implementing Gears\CQRS\Async\Serializer\CommandSerializer interface
Distributed systems
On distributed systems, such as micro-service systems, commands can be dequeued on a completely different part of the system, this part should of course know about commands and their contents but could eventually not have access to the command class itself
For example in the context of Domain Events on DDD a bounded context could handle command delivered by another completely different bounded context and of course won't be able to deserialize the original command as it is located on another domain
This can be solved in one of two ways, transform messages coming out from the message queue before handing them to the command serializer, or better by creating a custom Gears\CQRS\Async\Serializer\CommandSerializer encapsulating this transformation
Transformation can be as simple as changing command class to be reconstituted
Contributing
Found a bug or have a feature request? Please open a new issue. Have a look at existing issues before.
See file CONTRIBUTING.md
License
See file LICENSE included with the source code for a copy of the license terms.
