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Remote Services Distribution Provider based upon Apache Dubbo

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Dubbo OSGi R7 Remote Service Distribution Provider

ECF OSGi R7 Remote Services Distribution Provider based upon Apache Dubbo

ECF is an Eclipse Foundation open source project that implements the OSGi R7 version of the Remote Services and Remote Service Admin specifications.

This repo holds a Distribution provider that can be plugged in underneath ECF's Remote Services implementation. The following links provide access to resources about the Remote Services and Remote Service Admin (RSA) implementations themselves, along with linkt to other available Distribution and Discovery providers.

ECF Home page
ECF Wiki
ECF Download page
ECF Distribution Providers
ECF Discovery Providers

Installing and Running DemoService in Karaf

Note: By default, the Dubbo Distribution Provider features include the Hazelcast Discovery Provider in their install. The default configuration of this provider requires multicast be available on the LAN used to run the demos below. If multicast is not available, then the Hazelcast-based discovery will not occur for the consumer to discover the expored demo service as described below.

To add the Dubbo Distribution Provider repo:

    karaf@root()> feature:repo-add https://raw.githubusercontent.com/ECF/DubboProvider/master/build/karaf-features.xml

To install, start, and export the Demo Remote Service (available src in project here) type:

karaf@root()> feature:install ecf-rs-distribution-dubbo-demo-host

This should produce output similar to the following

16:32:52.127;EXPORT_REGISTRATION;exportedSR=[org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService];cID=URIID     [uri=dubbo://192.168.0.52:20880/org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService?anyhost=true&application=ecf-remoteservice-application&bind.ip=192.168.0.52&bind.port=20880&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService&methods=sayHello&pid=19968&register=true&release=&side=provider&timestamp=1568590371666];rsId=1
--Endpoint Description---
<endpoint-descriptions xmlns="http://www.osgi.org/xmlns/rsa/v1.0.0">
  <endpoint-description>
    <property name="ecf.endpoint.id" value-type="String" value="dubbo%3A%2F%2F192.168.0.52%3A20880%2Forg.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService%3Fanyhost%3Dtrue%26application%3Decf-remoteservice-application%26bind.ip%3D192.168.0.52%26bind.port%3D20880%26deprecated%3Dfalse%26dubbo%3D2.0.2%26dynamic%3Dtrue%26generic%3Dfalse%26interface%3Dorg.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService%26methods%3DsayHello%26pid%3D19968%26register%3Dtrue%26release%3D%26side%3Dprovider%26timestamp%3D1568590371666"/>
    <property name="ecf.endpoint.id.ns" value-type="String" value="ecf.namespace.dubbo"/>
    <property name="ecf.endpoint.ts" value-type="Long" value="1568590371527"/>
    <property name="ecf.rsvc.id" value-type="Long" value="1"/>
    <property name="endpoint.framework.uuid" value-type="String" value="9e7d1ffe-d2cd-4342-8ccf-7c8a70a24a1f"/>
    <property name="endpoint.id" value-type="String" value="7ad1afb8-c89a-417e-a77f-cd964f7544bf"/>
    <property name="endpoint.package.version.org.eclipse.ecf.examples.provider.dubbo.demo.api" value-type="String" value="1.0.0"/>
    <property name="endpoint.service.id" value-type="Long" value="127"/>
    <property name="objectClass" value-type="String">
      <array>
        <value>org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService</value>
      </array>
    </property>
    <property name="remote.configs.supported" value-type="String">
      <array>
        <value>ecf.dubbo.server</value>
      </array>
    </property>
    <property name="remote.intents.supported" value-type="String">
      <array>
        <value>osgi.basic</value>
        <value>passByValue</value>
        <value>exactlyOnce</value>
        <value>ordered</value>
        <value>osgi.async</value>
        <value>osgi.private</value>
        <value>dubbo</value>
      </array>
    </property>
    <property name="service.imported" value-type="String" value="true"/>
    <property name="service.imported.configs" value-type="String">
      <array>
        <value>ecf.dubbo.server</value>
      </array>
    </property>
  </endpoint-description>
</endpoint-descriptions>
---End Endpoint Description
Done.
karaf@root()>

The output above indicates that a DS-created DemoServiceImpl instance was

  • installed and started
  • the DemoServiceImpl remote service was created, registered locally, and exported (EXPORT_REGISTRATION) by the ECF RSA implementation, producing the ENDPOINT-DESCRIPTION xml shown in the console output as shown above
  • If Hazelcast is installed and able to connect to a multicast group on your LAN, the endpoint-description will be published via multicast. At that point consumers on the same LAN can discover, import, and remotely use the DemoService.

Installing and Running Consumer in Karaf (using a separate Karaf instance on same LAN)

To add the Dubbo Distribution Provider repo:

    karaf@root()> feature:repo-add https://raw.githubusercontent.com/ECF/DubboProvider/master/build/karaf-features.xml

To install and start the Demo Remote Service Consumer (avalable in project here) type:

karaf@root()> feature:install ecf-rs-distribution-dubbo-demo-consumer

After a few seconds for installation and start of the bundles, if you have exported as shown above in an other Karaf instance, and are on same LAN you should see output similar to the following on the consumer

karaf@root()> Bind demo service
service response was: Hello to you osgi consumer
15:21:00.254;IMPORT_REGISTRATION;importedSR=[org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService];cID=URIID [uri=dubbo://192.168.11.180:20880/org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService?anyhost=true&application=ecf-dubbo-app&bind.ip=192.168.11.180&bind.port=20880&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&interface=org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService&methods=sayHello&pid=19416&register=true&release=&side=provider&timestamp=1568845180829];rsId=1
--Endpoint Description---
<endpoint-descriptions xmlns="http://www.osgi.org/xmlns/rsa/v1.0.0">
  <endpoint-description>
    <property name="ecf.endpoint.id" value-type="String" value="dubbo%3A%2F%2F192.168.11.180%3A20880%2Forg.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService%3Fanyhost%3Dtrue%26application%3Decf-dubbo-app%26bind.ip%3D192.168.11.180%26bind.port%3D20880%26deprecated%3Dfalse%26dubbo%3D2.0.2%26dynamic%3Dtrue%26generic%3Dfalse%26interface%3Dorg.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService%26methods%3DsayHello%26pid%3D19416%26register%3Dtrue%26release%3D%26side%3Dprovider%26timestamp%3D1568845180829"/>
    <property name="ecf.endpoint.id.ns" value-type="String" value="ecf.namespace.dubbo"/>
    <property name="ecf.endpoint.ts" value-type="Long" value="1568845180632"/>
    <property name="ecf.rsvc.id" value-type="Long" value="1"/>
    <property name="endpoint.framework.uuid" value-type="String" value="32c3fc06-9220-4948-aabf-60f58d56fd13"/>
    <property name="endpoint.id" value-type="String" value="df97e7c2-17ec-420e-9fa3-13b60d67f2ff"/>
    <property name="endpoint.package.version.org.eclipse.ecf.examples.provider.dubbo.demo.api" value-type="String" value="1.0.0"/>
    <property name="endpoint.service.id" value-type="Long" value="104"/>
    <property name="objectClass" value-type="String">
      <array>
        <value>org.eclipse.ecf.examples.provider.dubbo.demo.api.DemoService</value>
      </array>
    </property>
    <property name="remote.configs.supported" value-type="String">
      <array>
        <value>ecf.dubbo.server</value>
      </array>
    </property>
    <property name="remote.intents.supported" value-type="String">
      <array>
        <value>osgi.basic</value>
        <value>passByValue</value>
        <value>exactlyOnce</value>
        <value>ordered</value>
        <value>osgi.async</value>
        <value>osgi.private</value>
        <value>dubbo</value>
      </array>
    </property>
    <property name="service.imported.configs" value-type="String">
      <array>
        <value>ecf.dubbo.client</value>
      </array>
    </property>
  </endpoint-description>
</endpoint-descriptions>
---End Endpoint Description

The output in between --Endpoint Description-- and --End Endpoint Description is debug output from RSA indicating that the remote service was imported (IMPORT_REGISTRATION in above output). Prior to the IMPORT_REGISTRATION is this output

karaf@root()> Bind demo service
service response was: Hello to you osgi consumer

The 'Bind demo service' output indicates that the remote service was bound to the consumer via DS - see here for the consumer source code.

The consumer then calls the DemoService.sayHello method, which makes the remote call to the DemoServiceImpl exported from the other Karaf instance and prints out the result of 'Hello to you osgi consumer'.

If you go back to the other (DemoServiceImpl) Karaf instance, you should see this in the console output

Call with name= osgi consumer to sayHello impl

This is the code in the DemoServiceImpl class showing that the consumer remotely called the DemoServiceImpl and it constructs and returns a value.

To summarize, this DemoServiceImpl (remote service host) is exported by one Karaf instance (EXPORT_REGISTRATION), and the consumer then discovers the remote DemoService, creates and binds the proxy into the consumer and the consumer calls the DemoService.sayHello remote service method, and prints out the result.

Install Dubbo Distribution Provider into Karaf without Installing and Running Demo

Note: By default, the Dubbo Distribution Provider features include the Hazelcast Discovery Provider in their install

1 Start Karaf

2 Add Dubbo Provider Features repo by typing:

karaf@root()> feature:repo-add https://raw.githubusercontent.com/ECF/DubboProvider/master/build/karaf-features.xml

3 Install Dubbo Server feature by typing:

karaf@root()> feature:install -v ecf-rs-distribution-dubbo-server

With the -v (verbose) argument, this will produce output showing the installation and start of multiple bundles, and complete with:

...multiple lines of output...
  org.eclipse.ecf.osgi.services.remoteserviceadmin.console/1.2.0.v20180713-1805
Done.
karaf@root()>

The Dubbo Remote Services Distribution Provider Server is now installed!

To install the Dubbo Remote Services Distribution Provider Client on either the same or some other Karaf instance

Install Dubbo Client feature by typing:

karaf@root()> feature:install -v ecf-rs-distribution-dubbo-client

This will produce output showing the installation and start of multiple bundles, and complete with:

...multiple lines of output...
Starting bundles:
  org.eclipse.ecf.provider.dubbo.client/1.0.0.201908301123
Done.
karaf@root()>

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Remote Services Distribution Provider based upon Apache Dubbo

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