DSB Management

Version 9 by Christophe Hamerling
on Apr 14, 2011 14:07.

<< Changes from 8 to 9

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Version 10 by Christophe Hamerling
on Apr 14, 2011 14:28.

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The main goal of the DSB management is to hide all the JBI complexity by wrapping and provided some JBI independant APIs and solutions. In order to achieve this, some hacks have been performed on the DSB side and are explained in the new sections.

{info}In the next sections we will refer to the DSB distribution folder with the _$DSB_HOME_ variable even if it is not set in the system environment.{info}

h1. {color:#492562}{*}Components{*}{color}

h2. Startup

We assume that we do not need to deal with JBI components and let the Service Bus manage them. To achieve this, we introduced an artifact repository file implementation where JBI artefacts are stored on the Service Bus side. This artefact repository is available under _$DSB_HOME/artifacts/_ and is splited into 3 parts : components, sa and sl.

The components available under _$DSB_HOME/artifacts/components_ can be automatically started at DSB startup by filling the _embedded.component.list_ property in _$DSB_HOME/conf/dsb.cfg_. For example, if the dsb.cfg file is filled like :

{code}
# Components to start as CSV
embedded.component.list=petals-bc-soap,petals-bc-rest
{code}
and if the SOAP and REST components are available in the components folder, they will be started automatically when the container starts (no more JBI lifecycle management for these components is needed).

h2. Configuration

We forked the standard Petals ESB components to be able to configure them more easily and to share information between the container and the components. This section introduces what type of configuration is possible for the DSB components. Especially, we introduced a new way to define ports : instead of having to modify the components themselves (the jbi.xml component) or to have to deal with some JMX calls which are not compliant with the easy approach we want to have, component ports can be configured in the _$DSB_HOME/conf/components.properties_ file like this :

{code}
petals-bc-soapproxy.port=8083
petals-bc-soap.port=8084
petals-bc-rest.port=8082
{code}

h1. Web Service

The DSB can be managed from remote clients using the Web Service API. The initial goal of the Web service API is to hide the JBI layer which is not Internet-friendly (even if some JBI aspects are used and will be explained in this section). This section gives details on how to use the Web service client library.

h2. {color:#492562}{*}Deploy a JBI Service Assembly{*}{color}

A JBI Service Assembly (SA) can be uploaded to the DSB artefact repository (a folder in the default implementation as described earlier). Once the SA is uploaded, one can call the SA lifecycle operations on the uploaded SA.

A code sample is available at ([http://chamerling.org/2010/04/12/librairie-cliente-pour-petals-esb/])

h2. Bind and Expose Services

A more easy way to work with services is to let the DSB the responsability to configure itself in order to bind or expose services as it can be done with the help of JBI SAs. The default implementation of the DSB comes with a management API which is dedicated to that. By using this Web service API, you just use standard SOAP client or library to communicate with the Management layer of the DSB.

h3. SOAP-based Services

Some utilities based on top of the previously mentioned API are also available to preconfigure the DSB at configuration time. With their help you are able to define sets of services which will be automatically bound to the DSB when it starts.

h3. 'Design' Time

In order to predefine a set of services to bind at startup, a simple properties file located under _$DSB_HOME/conf/services2bind.cf{_}g is defined as:
{code}
# A list of services to bind at startup
# The key MUST start with the protocol to use to bind the service and MUST be unique in this properties file
# CSV Values are also possible

#soap.0=http://localhost:8080/services/Ping?wsdl
#soap.1=http://localhost:8080/services/Pong?wsdl
#rest.0=http://localhost:7777/rest/Weather

soap.proactivespace=http://ns306320.ovh.net:8090/soa4all-space-proactive/ws/ProactiveSemanticSpaceWS?wsdl
soap.owlimspace=http://94.23.221.97:8080/soa4all-space-owlim/ws/SemanticSpaceWS?wsdl
rest.yahooweather=http://weather.yahooapis.com/

#example of service list as CSV
soap.list=http://foo.com/bar,http://bar.com/foo
rest.list=
{code}

In the previous configuration snippet, 

h3. Runtime

h4. SOAP-based Services

The DSB SOAP Component is in charge or binding external services to the bus and to expose DSB services as SOAP services. This can be done by using a collection of Web services embedded and provided by the DSB itself.

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