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Informations about the package rabbitmq-scaler-bundle
RabbitMqScalerBundle
Provides a command to launch RabbitMq consumers when the need arises.
About
The RabbitMqScalerBundle extends php-amqplib's RabbitMqBundle by adding a command that handles launching your consumers when they are needed.
Every N seconds (default is N=10), the command will check whether there are enough workers to handle the number of messages in the given queue.
The command inherits from rabbitmq:consumer, so that any argument for that command will be applied to the command that launches a consumer.
Consumers are launched, but not terminated. This is something that can be done automatically by setting a connection timeout in your consumer's configuration, or by specifying a number of messages to handle using the option.
Installation
Require the bundle and its dependencies with composer:
Register the bundle and the bundle that it depends on:
Configuration
Queue options
The command will regularly query the RabbitMQ server for the state of the queue being consumed. For this purpose, it needs to know the exact options that you have set up with php-amqplib's RabbitMqBundle.
For example, with the following configuration:
You will need to add this configuration:
Defaults for the command
You can change the defaults in your configuration file.
The defaults are defined thusly:
Examples
No consumers when there are no tasks, a maximum amount of 20 consumers, check every 5 seconds:
Default settings, but each consumer must handle at most 50 messages, or quit when they have used over 100 MB of RAM:
Default settings, but each consumer is niced, and the command will stop after 10 iterations:
