Akka persistence jdbc driver

When used, akkapersistencejdbc will throw an illegalargumentexception if offered to the readjournal. Akkapersistencejdbc is a plugin for akkapersistence that asynchronously writes journal and snapshot entries entries to a configured jdbc store. As you might know with jpa, the metainfpersistence. It implements the full akkapersistencequery api and is therefore very useful for implementing dddstyle application models using akka and scala for creating reactive applications. Gcp datastore akka persistence plugin alternatives scala. Akka persistence journal and snapshot store backed by sql server database. This is an excerpt from the scala cookbook partially modified for the internet. To make use of jdbc support you need to add the persistence jdbc module to your project while also having to add the jar for your jdbc driver. Akka persistence comes with a couple of precanned persistence storage mechanisms, and there are many more community based storage frameworks that you can use.

Reading from postgres and writing to right format in cassandra. Akka persistence query complements persistence by providing a universal asynchronous stream based query interface that various journal plugins can implement in order to expose their query capabilities the most typical use case of persistence query is implementing the socalled query side also known as read side in the popular cqrs architecture pattern. The jpa application is typically required to be packaged into a persistence unit jar file. With traditional approaches to remote access, performance bottlenecks can spell disaster for applications. It implements the full akka persistence query api and is therefore very useful for implementing dddstyle application models using akka and scala for creating reactive applications. I am currently evaluating akkapersistence, specifically with respect to its throughput. Being mostly a techie, ive recently and admittedly been deceived by my own dilbertesque attitude when i stumbled upon this buzzwordfilled techcrunch article about espresso logic. You will also need to add the jar for your jdbc database driver. This will be common, as when the jdbc driver manager is asked to connect to a given url it passes the url to each loaded driver in turn. Lagom makes use of akkapersistencejdbc to persist entities to the database. It implements the full akkapersistencequery api and is therefore very. Without any further introduction, heres the source code for a complete scala class an object, actually that connects to a mysql database using nothing but plain old jdbc.

A very important thing to keep in mind when using queries spanning multiple persistenceids, such as eventsbytag is that the order of events at which the events appear in the stream rarely is guaranteed or stable between materializations journals may choose to opt for strict ordering of the events, and should then document explicitly what kind of ordering guarantee they. How to change maxmin jdbc connections of akkapersistence. So, if your actor system works with blocking calls, akka allows to configure separate thread pool for that subsystem, i. I am not completely sure if it is possible to share the slick database connection pool between play and akkapersistencejdbc. Akkapersistencejdbc is a plugin for akkapersistence that synchronously writes journal and snapshot entries entries to a configured jdbc store. I just ran a simple jdbc connection and sql select test, and everything seems to work just as it does in java. As far as i know postgresreadjournal is not part of akkapersistencejdbc. With jdbc, a database is represented by a url uniform resource locator. Version history akkaakkapersistencejdbc wiki github. The problem im getting while trying to use persistence query with the read journal is java. In addition to the akka project which is for java and scala the jvm. Net persistence and how you can use these features to restore the internal actor state if the actor restarts or the server crashes. Java persistenceruntime wikibooks, open books for an. Install the client driver on the machine where the thirdparty application is installed.

It supports writing journal messages and snapshots to two tables. Showing the top 1 github repositories that depend on akka. I want to use it in a system consisting of approximately 000 actors, each representing an aggregate root, distributed over a sharded cluster of actor systems. The akkapersistencejdbc plugin uses slick to map tables and manage asynchronous execution of jdbc calls. The initial question often seems to be how do i handle jdbcblocking calls with akka, the answer to which almost always involves bulkheading which well get to a bit later in this post. I have a running project with using of akkapersistencejdbc plugin and postgresql as a backend.

Put it into the confmetainf directory, so it will be properly added to your classpath. This way the components create their own slick database i. This involves setting the appropriate jdbcrelated broker configuration properties and using the database manager utility imqdbmgr to create the proper database schema. So for example, to configure a postgresql database, you can add the following to your nf.

Aurora jdbc connections leaking between connection pools. Both journal and snapshot store share the same configuration keys however they resides in separate scopes, so they are definied distinctly for either journal or snapshot store. But how can i convert the existing events more than 4gb size in postgres to cassandra. Net persistence journal and snapshot store backed by oracle odp. The driver throws an sqlexception if it is the right driver to connect to the given url but has trouble connecting to the database.

Lagom uses the akkapersistencejdbc plugin to persist entities to the database. The jdbc driver of akka persistence jdbc does not provide access to the driver profile this way the only officially supported api for message deletion is the following akka. You want to connect to a mysql database or any other database with a jdbc driver from a scala application using plain old jdbc. Im having a problem with akkapersistence and akkasharding. Akka persistence allows you to persist the internal state of stateful.

Jdbcbased persistence instead of using a filebased data store, you can set up a broker to access any data store accessible through a jdbccompliant driver. How to connect to a mysql database with scala and jdbc. Net persistence fundamentals, youre going to learn about the core features of akka. This article examines some of the major advancements that jpa 2 made in its api, the java persistence query language jpql, and the properties defined in its persistence.

Returns null if this is the wrong kind of driver to connect to the given url. Meanwhile, actor system usually works on a limited thread pool compared in size to the number of your cpu cores. The java persistence api version 2 jpa 2 introduced new and interesting features to the java community. To specify an ipv6 address your must enclose the host parameter with square brackets, for example. I am trying to change the minimum and maximum pool size of jdbc connections used by akkapersistencejdbc i tried to change the following in my nf jdbcjournal slick. With postgresql, this takes one of the following forms. Horusiathakkacqrs event sourcing example build on akka. Net actors help you to manage concurrency, by default they only exist inmemory.

This means lagom internally configures it to use the right slick profile for your database. The akkapersistencejdbc plugin only supports the akka. Both journal and snapshot store share the same configuration keys however they resides in separate scopes, so they are defined distinctly for either journal or snapshot store. I am trying to change the minimum and maximum pool size of jdbc connections used by akka persistence jdbc i tried to change the following in my nf jdbc journal slick. It specifies the persistence units and declares the managed persistence classes, the objectrelation mapping, and the database connection details. But it should be possible to configure akkapersistencejdbc and play to use similar connection settings. Every now and then, sometimes after running our app for a long time i get this error. Akkapersistencejdbc is a plugin for akkapersistence that writes journal entries to a configured jdbc database. From the creators of play, get technology enhancements, monitoring, and expert support with akka platform from lightbend.