Reactive Relational Database Connectivity Connection Pool Implementation

This project contains a R2DBC connection pool using reactor-pool for reactive connection pooling.

Code of Conduct

This project is governed by the R2DBC Code of Conduct. By participating, you are expected to uphold this code of conduct. Please report unacceptable behavior to [email protected].

Getting Started

Configuration of the ConnectionPool can be accomplished in several ways:

URL Connection Factory Discovery

ConnectionFactory connectionFactory = ConnectionFactories.get("r2dbc:pool:<my-driver>://<host>:<port>/<database>[?maxIdleTime=PT60S[&…]");

Publisher<? extends Connection> connectionPublisher = connectionFactory.create();

Programmatic Connection Factory Discovery

ConnectionFactory connectionFactory = ConnectionFactories.get(ConnectionFactoryOptions.builder()
   .option(DRIVER, "pool")
   .option(PROTOCOL, "postgresql") // driver identifier, PROTOCOL is delegated as DRIVER by the pool.
   .option(HOST, "…")
   .option(PORT, "…") 
   .option(USER, "…")
   .option(PASSWORD, "…")
   .option(DATABASE, "…")
   .build());

The delegated DRIVER (via PROTOCOL) above refers to the r2dbc-driver, such as h2, postgresql, mssql, mysql, spanner.

Publisher<? extends Connection> connectionPublisher = connectionFactory.create();

// Alternative: Creating a Mono using Project Reactor
Mono<Connection> connectionMono = Mono.from(connectionFactory.create());

Supported ConnectionFactory Discovery Options

All other properties are driver-specific.

Programmatic Configuration

ConnectionFactory connectionFactory = …;

ConnectionPoolConfiguration configuration = ConnectionPoolConfiguration.builder(connectionFactory)
   .maxIdleTime(Duration.ofMillis(1000))
   .maxSize(20)
   .build();

ConnectionPool pool = new ConnectionPool(configuration);
 

Mono<Connection> connectionMono = pool.create();

// later

Connection connection = …;
Mono<Void> release = connection.close(); // released the connection back to the pool

// application shutdown
pool.dispose();

Maven configuration

Artifacts can be found on Maven Central:

<dependency>
  <groupId>io.r2dbc</groupId>
  <artifactId>r2dbc-pool</artifactId>
  <version>${version}</version>
</dependency>

If you'd rather like the latest snapshots of the upcoming major version, use our Maven snapshot repository and declare the appropriate dependency version.

<dependency>
  <groupId>io.r2dbc</groupId>
  <artifactId>r2dbc-pool</artifactId>
  <version>${version}.BUILD-SNAPSHOT</version>
</dependency>

<repository>
  <id>sonatype-nexus-snapshots</id>
  <name>Sonatype OSS Snapshot Repository</name>
  <url>https://oss.sonatype.org/content/repositories/snapshots</url>
</repository>

Getting Help

Having trouble with R2DBC? We'd love to help!

• Check the spec documentation, and Javadoc.
• If you are upgrading, check out the changelog for "new and noteworthy" features.
• Ask a question - we monitor stackoverflow.com for questions tagged with r2dbc. You can also chat with the community on Gitter.
• Report bugs with R2DBC Pool at github.com/r2dbc/r2dbc-pool/issues.

Reporting Issues

R2DBC uses GitHub as issue tracking system to record bugs and feature requests. If you want to raise an issue, please follow the recommendations below:

• Before you log a bug, please search the issue tracker to see if someone has already reported the problem.
• If the issue doesn't already exist, create a new issue.
• Please provide as much information as possible with the issue report, we like to know the version of R2DBC Pool that you are using and JVM version.
• If you need to paste code, or include a stack trace use Markdown ``` escapes before and after your text.
• If possible try to create a test-case or project that replicates the issue. Attach a link to your code or a compressed file containing your code.

Building from Source

You don't need to build from source to use R2DBC Pool (binaries in Maven Central), but if you want to try out the latest and greatest, R2DBC Pool can be easily built with the maven wrapper. You also need JDK 1.8.

 $ ./mvnw clean install

If you want to build with the regular mvn command, you will need Maven v3.5.0 or above.

Also see CONTRIBUTING.adoc if you wish to submit pull requests. Commits require Signed-off-by (git commit -s) to ensure Developer Certificate of Origin.

Staging to Maven Central

To stage a release to Maven Central, you need to create a release tag (release version) that contains the desired state and version numbers (mvn versions:set versions:commit -q -o -DgenerateBackupPoms=false -DnewVersion=x.y.z.(RELEASE|Mnnn|RCnnn) and force-push it to the release-0.x branch. This push will trigger a Maven staging build (see build-and-deploy-to-maven-central.sh).

License

This project is released under version 2.0 of the Apache License.