akka-persistence-sql-async

A journal and snapshot store plugin for akka-persistence using RDBMS. Akka-persistence-sql-async executes queries by ScalikeJDBC-Async that provides non-blocking APIs to talk to databases.

Akka-persistence-sql-async supports following databases.

• MySQL
• PostgreSQL

This library is tested against akka-persistence-tck.

Usage

Dependency

You should add the following dependency.

libraryDependencies += "com.okumin" %% "akka-persistence-sql-async" % "0.4.0"

And then, please include the mysql-async if you use MySQL.

libraryDependencies += "com.github.mauricio" %% "mysql-async" % "0.2.20"

And if you use PostgreSQL.

libraryDependencies += "com.github.mauricio" %% "postgresql-async" % "0.2.20"

Configuration

In application.conf,

akka {
  persistence {
    journal.plugin = "akka-persistence-sql-async.journal"
    snapshot-store.plugin = "akka-persistence-sql-async.snapshot-store"
  }
}

akka-persistence-sql-async {
  journal.class = "akka.persistence.journal.sqlasync.MySQLAsyncWriteJournal"
  snapshot-store.class = "akka.persistence.snapshot.sqlasync.MySQLSnapshotStore"

  # For PostgreSQL
  # journal.class = "akka.persistence.journal.sqlasync.PostgreSQLAsyncWriteJournal"
  # snapshot-store.class = "akka.persistence.snapshot.sqlasync.PostgreSQLSnapshotStore"

  user = "root"
  password = ""
  url = "jdbc:mysql://localhost/akka_persistence_sql_async"
  max-pool-size = 4
  wait-queue-capacity = 10000

  metadata-table-name = "persistence_metadata"
  journal-table-name = "persistence_journal"
  snapshot-table-name = "persistence_snapshot"
}

Table schema

Create the database and tables for journal and snapshot store.

MySQL

CREATE TABLE IF NOT EXISTS {your_metadata_table_name} (
  persistence_key BIGINT NOT NULL AUTO_INCREMENT,
  persistence_id VARCHAR(255) NOT NULL,
  sequence_nr BIGINT NOT NULL,
  PRIMARY KEY (persistence_key),
  UNIQUE (persistence_id)
) ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS {your_journal_table_name} (
  persistence_key BIGINT NOT NULL,
  sequence_nr BIGINT NOT NULL,
  message LONGBLOB NOT NULL,
  PRIMARY KEY (persistence_key, sequence_nr),
  FOREIGN KEY (persistence_key) REFERENCES {your_metadata_table_name} (persistence_key)
) ENGINE = InnoDB;

CREATE TABLE IF NOT EXISTS {your_snapshot_table_name} (
  persistence_key BIGINT NOT NULL,
  sequence_nr BIGINT NOT NULL,
  created_at BIGINT NOT NULL,
  snapshot LONGBLOB NOT NULL,
  PRIMARY KEY (persistence_key, sequence_nr),
  FOREIGN KEY (persistence_key) REFERENCES {your_metadata_table_name} (persistence_key)
) ENGINE = InnoDB;

PostgreSQL

CREATE TABLE IF NOT EXISTS {your_metadata_table_name} (
  persistence_key BIGSERIAL NOT NULL,
  persistence_id VARCHAR(255) NOT NULL,
  sequence_nr BIGINT NOT NULL,
  PRIMARY KEY (persistence_key),
  UNIQUE (persistence_id)
);

CREATE TABLE IF NOT EXISTS {your_journal_table_name} (
  persistence_key BIGINT NOT NULL REFERENCES {your_metadata_table_name}(persistence_key),
  sequence_nr BIGINT NOT NULL,
  message BYTEA NOT NULL,
  PRIMARY KEY (persistence_key, sequence_nr)
);

CREATE TABLE IF NOT EXISTS {your_snapshot_table_name} (
  persistence_key BIGINT NOT NULL REFERENCES {your_metadata_table_name}(persistence_key),
  sequence_nr BIGINT NOT NULL,
  created_at BIGINT NOT NULL,
  snapshot BYTEA NOT NULL,
  PRIMARY KEY (persistence_key, sequence_nr)
);

Release Notes

0.4.0 - Nov 5, 2016

• Update mysql-async and postgresql-async

0.3.1 - Oct 15, 2015

• Never execute invalid SQLs

0.3.0 - Oct 7, 2015

• Update Akka to 2.4

0.2.1 - Sep 25, 2015

• Keep the highest sequence number

0.2 - Apr 5, 2015

• Change pass to password in configuration

0.1 - Sep 30, 2014

• The first release

License

Apache 2.0