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Transactional Event Library for Jakarta EE 9\n\nA [Transactional Event Library](https://jonasrutishauser.github.io/transactional-event/) that implements the [outbox pattern](https://microservices.io/patterns/data/transactional-outbox.html) for Jakarta EE 9.\n\n[![GNU Lesser General Public License, Version 3, 29 June 2007](https://img.shields.io/github/license/jonasrutishauser/transactional-event.svg?label=License)](http://www.gnu.org/licenses/lgpl-3.0.txt)\n[![Maven Central](https://img.shields.io/maven-central/v/io.github.jonasrutishauser/transactional-event-api.svg?label=Maven%20Central)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22io.github.jonasrutishauser%22%20a%3A%22transactional-event-api%22)\n[![Build Status](https://img.shields.io/github/actions/workflow/status/jonasrutishauser/transactional-event/ci.yml.svg?label=Build)](https://github.com/jonasrutishauser/transactional-event/actions)\n[![Coverage](https://img.shields.io/codecov/c/github/jonasrutishauser/transactional-event/master.svg?label=Coverage)](https://codecov.io/gh/jonasrutishauser/transactional-event)\n\n## Used Jakarta EE APIs\nThe following APIs are required:\n- CDI 3.0\n- Concurrency Utilities 2.0\n- JDBC 4.2\n- JTA 2.0\n\nThe following APIs are optionally supported for serialization:\n- JAXB 3.0\n- JSON-B 2.0\n\n## Publish an Event\nAn Event can be published using the [`EventPublisher`](https://jonasrutishauser.github.io/transactional-event/snapshot/transactional-event-api/apidocs/com/github/jonasrutishauser/transactional/event/api/EventPublisher.html) API:\n\n```java\n   @Inject\n   private EventPublisher publisher;\n   \n   public void someMethod() {\n      ...\n      SomeEvent event = ...\n      publisher.publish(event);\n      ...\n   }\n```\n\n## Handle an Event\nFor every event type published there must be a corresponding [`Handler`](https://jonasrutishauser.github.io/transactional-event/snapshot/transactional-event-api/apidocs/com/github/jonasrutishauser/transactional/event/api/handler/Handler.html) (qualified by [`EventHandler`](https://jonasrutishauser.github.io/transactional-event/snapshot/transactional-event-api/apidocs/com/github/jonasrutishauser/transactional/event/api/handler/EventHandler.html)):\n\n```java\n@Dependent\n@EventHandler\nclass SomeEventHandler extends AbstractHandler\u003cSomeEvent\u003e {\n   @Override\n   protected void handle(SomeEvent event) {\n      ...\n   }\n}\n```\n\n### CDI \u003e= 4.1\nWith a CDI version greater or equal to 4.1 it is even possible to simply annotate any class bean method (not static and not private) with `@EventHandler`.\nThe annotated method must have exactly one argument.\n\n```java\n@Dependent\nclass SomeBean {\n   @EventHandler\n   void doIt(SomeEvent event) {\n      ...\n   }\n}\n```\n\n## Data Source\nThe library expects that the following table exists when using the `javax.sql.DataSource` with the [`Events`](https://jonasrutishauser.github.io/transactional-event/snapshot/transactional-event-api/apidocs/com/github/jonasrutishauser/transactional/event/api/Events.html) qualifier:\n\n```sql\nCREATE TABLE event_store (\n\tid VARCHAR(50) NOT NULL,\n\tevent_type VARCHAR(50) NOT NULL,\n\tcontext VARCHAR(4000),\n\tpayload VARCHAR(4000) NOT NULL,\n\tpublished_at TIMESTAMP NOT NULL,\n\ttries INT NOT NULL,\n\tlock_owner VARCHAR(50),\n\tlocked_until BIGINT NOT NULL,\n\tPRIMARY KEY (id)\n);\n\nCREATE INDEX event_store_locked_until ON event_store (locked_until);\n```\n\nThe required `javax.sql.DataSource` can be specified like the following:\n\n```java\n@Dependent\nclass EventsDataSource {\n   @Events\n   @Produces\n   @Resource(name = \"someDb\")\n   private DataSource dataSource;\n}\n```\n\n## Configuration\nThe [Quarkus Configuration](https://jonasrutishauser.github.io/transactional-event/snapshot/transactional-event-quarkus/quarkus-configuration.html) is documented on the [project site](https://jonasrutishauser.github.io/transactional-event/).\n\nThe configuration properties are the same without the `quarkus.` prefix and camel case instead of kebab case if not running in Quarkus.\n\n## Metrics (if mpMetrics is available)\nIf mpMetrics is enabled on the server there will be the following metrics\n- application_com_github_jonasrutishauser_transaction_event_published_total (number of published events)\n- application_com_github_jonasrutishauser_transaction_event_failedattempts_total (these are the number of failed attempts to process an event)\n- application_com_github_jonasrutishauser_transaction_event_success_total (these are the number of successfully processed events)\n- application_com_github_jonasrutishauser_transaction_event_blocked_total (these are the number of blocked events because the maximum number of retries has been reached)\n- application_com_github_jonasrutishauser_transaction_event_unblocked_total (these are the number of unblocked events)\n- application_com_github_jonasrutishauser_transaction_event_deleted_total (these are the number of deleted events)\n- application_com_github_jonasrutishauser_transaction_event_processing (the number of events being processed currently in total)\n- application_com_github_jonasrutishauser_transaction_event_dispatched_processing (the number of dispatched events by a timer being processed currently. This metric can be used for fine-tuning transactional.event.maxConcurrentDispatching and transactional.event.maxAquire)\n- application_com_github_jonasrutishauser_transaction_event_all_in_use_interval (interval between lookups for events to process when maxConcurrentDispatching is reached)\n- application_com_github_jonasrutishauser_transaction_event_max_dispatch_interval (maximum interval between lookups for events to process)\n- application_com_github_jonasrutishauser_transaction_event_initial_dispatch_interval (initial interval between lookups for events to process)\n- application_com_github_jonasrutishauser_transaction_event_max_aquire (maximum number of events aquired per query)\n- application_com_github_jonasrutishauser_transaction_event_max_concurrent_dispatching (maximum number of dispatched events being processed concurrently)\n- application_com_github_jonasrutishauser_transaction_event_dispatch_interval (interval between lookups for events to process)\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonasrutishauser%2Ftransactional-event","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fjonasrutishauser%2Ftransactional-event","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fjonasrutishauser%2Ftransactional-event/lists"}