Reactive Relational Database Connectivity Proxy Framework

This project contains the proxy framework of the R2DBC SPI. R2DBC is a Reactive Foundation project.

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 info@r2dbc.io.

Maven configuration

Artifacts can be found on Maven Central:

<dependency>
  <groupId>io.r2dbc</groupId>
  <artifactId>r2dbc-proxy</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-proxy</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>

R2DBC SPI versions

R2DBC Proxy	R2DBC SPI
1.0.x, 1.1.x	1.0.x
0.9.x	0.9.x
0.8.x	0.8.x

Documentation

• Current release
  • Reference Doc.
  • API Doc.
  • Changelog
• Snapshot
  • Reference Doc.
  • API Doc.
  • Changelog
• Other versions (TBD)

Getting Started

Here shows how to create a proxy ConnectionFactory.

URL Connection Factory Discovery

ConnectionFactory connectionFactory = ConnectionFactories.get("r2dbc:proxy:<driver>//<host>:<port>>/<database>[?proxyListener=<fqdn>]");

Sample URLs:

# with driver
r2dbc:proxy:postgresql://localhost:5432/myDB?proxyListener=com.example.MyListener

# with pooling
r2dbc:proxy:pool:postgresql://localhost:5432/myDB?proxyListener=com.example.MyListener&maxIdleTime=PT60S

Programmatic Connection Factory Discovery

ConnectionFactory connectionFactory = ConnectionFactories.get(ConnectionFactoryOptions.builder()
   .option(DRIVER, "proxy")
   .option(PROTOCOL, "postgresql")
   .build());

Mono<Connection> connection = connectionFactory.create();

Supported Connection Factory Discovery options:

Option	Description
driver	Must be proxy
protocol	Delegating connection factory driver
proxyListener	Comma separated list of fully qualified proxy listener class names (Optional)

When programmatically ConnectionFactoryOptions are constructed, proxyListener option allows following values:

• Comma separated list of fully qualified proxy listener class names
• Proxy listener class
• Proxy listener instance
• Collection of above

Programmatic creation with ProxyConnectionFactory

ConnectionFactory original = ...

ConnectionFactory connectionFactory = ProxyConnectionFactory.builder(original)
    .onAfterQuery(queryInfo ->
        ...  // after query callback logic
    )
    .onBeforeMethod(methodInfo ->
        ...  // before method callback logic
    )
    .listener(...)  // add listener
    .build();

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

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

Samples

r2dbc-proxy-samples repository contains sample listener implementations.

• Distributed tracing - TracingExecutionListener
• Micrometer metrics - MetricsExecutionListener

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 Proxy at github.com/r2dbc/r2dbc-proxy/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 Proxy 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 Proxy (binaries in Maven Central), but if you want to try out the latest and greatest, R2DBC Proxy can be easily built with the maven wrapper. You also need JDK 1.8 and Docker to run integration tests.

 $ ./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.

Building the documentation

Building the documentation uses maven asciidoctor plugin.

 $ ./mvnw clean exec:java@generate-micrometer-docs asciidoctor:process-asciidoc

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.