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Example code of morebec/orkestra-postgresql-eventstore

Informations about the package orkestra-postgresql-eventstore

PostgreSqlEventStore

This component provides an implementation of a the an Event Store (from the [EventSourcing Component]()) using PostgreSQL.

Under the hood, it uses DBAL for communication with PostgreSQL.

Installation

Usage

Event Store Subscriptions

The pu/sub mechanism of the event store is implemented using PostgreSQL's LISTEN/NOTIFY feature. Unfortunately given the nature of PHP being a synchronous RunTime, the only way to have Pub/Sub capabilities is to run a LISTEN loop:

This is can be used with Event Processors.

PostgreSqlEventStorePositionStorage

An implementation of EventStorePositionStorageInterface is also shipped with the component as the PostgreSqlEventStorePositionStorage, which also relies on DBAL for communication with PostgreSQL:

PostgreSqlEventProcessor

A ready-made implementation of an Event Processor with support for the PostgreSqlEventStore is also provided with this component:

Given that the EventStoreInterface can be decorated, the processor cannot directly use the PostgreSqlEventStore through the EventStoreInterface. Also, since it requires using specific methods from the implementation PostgreSqlEventStore to access some PostgreSQL specific features, the actual instance of the PostgreSqlEventStore must be injected additionally. This is why both are injected in the constructor.

Testing

To run the tests execute the following command:

It is required to have an instance of postgresql running with a password-less role postgres and a database named postgres. To easily get this setup and running a docker-compose configuration file is available at the root of this project.

To run it simply execute the following command:

All versions of orkestra-postgresql-eventstore with dependencies

PHP Build Version
Package Version
Requires php Version >=7.4
ext-json Version *
ext-pdo Version *
ext-pgsql Version *
ext-pdo_pgsql Version *
doctrine/dbal Version ^3.0
morebec/orkestra-datetime Version ^2.5.6
morebec/orkestra-event-sourcing Version ^2.5.6
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