Each Validation service runs on the Petals Validation component.
The Petals Validation component has native operations to invoke. These operations are inherited by the Validation services.
A Validation service cannot add additional operations. It only has the ones of the XSLT component.
The version 1.1 of the Petals Validation component exposes two operations.
* *validate*: the received message is validated against a XML-Schema. The service returns a boolean response indicating if the message is valid.
* *filter*: the received message is validated against a XML-Schema. If the message is valid, this same message is returned. Otherwise, a fault is raised.
h2. The "validate" operation
The fully qualified name of this operation is:
* Name space URI: *{html}http://petals.ow2.org/components/validation/version-1{html}\*
* Local part: *validate*
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This operation only supports the *InOut* message exchange pattern (MEP).
When invoking this operation, you must call it using its fully qualified name.
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Here is the execution flow for this operation:
# The received message is validated against the XML-Schema embedded by the service.
# The validation response is wrapped into a message and sent back.
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More precisely, if the message is valid, the returned message is
{code:lang=xml}
<!-- The target name space depends on the version of the Validation component -->
<tns:validateResponse xmlns:tns='http://petals.ow2.org/components/validation/version-1'>
<tns:valid>true</tns:valid>
</tns:validateResponse>
{code}
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Otherwise, it is
{code:lang=xml}
<!-- The target name space depends on the version of the Validation component -->
<tns:validateResponse xmlns:tns='http://petals.ow2.org/components/validation/version-1'>
<tns:valid>false</tns:valid>
<tns:comment>The reason explaining why it is invalid.</tns:comment>
</tns:validateResponse>
{code}
h2. The "filter" operation
The fully qualified name of this operation is:
* Name space URI: *{html}http://petals.ow2.org/components/validation/version-1{html}\*
* Local part: *filter*
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This operation only supports the *InOut* message exchange pattern (MEP).
When invoking this operation, you must call it using its fully qualified name.
\\
Here is the execution flow for this operation:
# The received message is validated against the XML-Schema embedded by the service.
# If the message is valid, this same message is sent back. Otherwise, a fault is raised.
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{code:lang=xml}
<!-- The target name space depends on the version of the Validation component -->
<tns:validationFault xmlns:tns='http://petals.ow2.org/components/validation/version-1'>
<tns:message>The fault message.</tns:message>
<tns:validationFault>
{code}
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{warning}
If the operation is invalid (i.e. is neither *validate*, nor *filter*), then *filter* is the operation by default.
{warning}
h2. WSDL definitions
By default, services deployed on the Validation component do not need a WSDL.
However, as a good practice, it is better to provide it one.
The operations are known.
The only unknown is whether the input messages will be *anyType* or the *exact top element of the XML Schema*.
It is let to the choice of the user.
The output message for the operation *filter* should however be described by the XML Schema.
h2. JBI descriptor
The Service Unit descriptor file ( jbi.xml ) looks like this:
{code:lang=xml}<?xml version="1.0" encoding="UTF-8"?>
<jbi:jbi version="1.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jbi="http://java.sun.com/xml/ns/jbi"
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5"
xmlns:validation="http://petals.ow2.org/components/validation/version-1"
xmlns:serviceNs="http://petals.ow2.org/simpletransformation">
<jbi:services binding-component="false">
<jbi:provides
interface-name="serviceNs:ValidationInterface"
service-name="serviceNs:ValidationService"
endpoint-name="ValidationEndpoint">
<!-- WSDL file -->
<petalsCDK:wsdl>your optional description wsdl file.wsdl</petalsCDK:wsdl>
<!-- Validation specific fields -->
<validation:schema>schema.xsd</validation:schema>
</jbi:provides>
</jbi:services>
</jbi:jbi>
{code}
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A JBI descriptor for an Validation service-unit can only define one _provides_ block.
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{include:0 CDK SU Provide Configuration}
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{center}*Configuration of a Service Unit to provide a service (Validation)*{center}
{table-plus}
|| Parameter || Description || Default || Required ||
| schema | Location of the XSD schema. This path must be a relative path from the root of the SU package. | {center}\-{center} | {center}Yes{center} |
{table-plus}
{include:0 CDK SU Interceptor configuration}
h2. Service-Unit content
The service unit must contain the XML Schema and the JBI descriptor (jbi.xml file).
It is also highly recommended to provide a WSDL description for this service (though it is optional).
This WSDL is not mandatory, but not providing it will prevent your service from interacting with other Petals services and components.
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The directory structure of a SU for the Petals-SE-Validation looks like this:
{noformat}
su-xslt-TransformationName-provide.zip
+ META-INF
- jbi.xml
+ XsltService.wsdl (recommended)
+ myfile.xsd (required)
+ myfile2.xsd (required if myfile2.xsd is imported in myfile.xsd)
{noformat}
h1. Configuring the component
The component can be configured through its JBI descriptor file, as shown below.
{code:lang=xml}<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<jbi version="1.0"
xmlns='http://java.sun.com/xml/ns/jbi'
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
xmlns:petalsCDK="http://petals.ow2.org/components/extensions/version-5">
<component type="service-engine">
<identification>
<name>petals-se-validation</name>
<description>A VALIDATION Service Engine</description>
</identification>
<component-class-name description="Validation Component class">org.ow2.petals.se.validation.ValidationComponent</component-class-name>
<component-class-path><path-element/></component-class-path>
<bootstrap-class-name>org.ow2.petals.component.framework.DefaultBootstrap</bootstrap-class-name>
<bootstrap-class-path><path-element/></bootstrap-class-path>
<petalsCDK:acceptor-pool-size>3</petalsCDK:acceptor-pool-size>
<petalsCDK:processor-pool-size>10</petalsCDK:processor-pool-size>
<petalsCDK:ignored-status>DONE_AND_ERROR_IGNORED</petalsCDK:ignored-status>
<petalsCDK:notifications>false</petalsCDK:notifications>
<petalsCDK:jbi-listener-class-name>org.ow2.petals.se.validation.listener.JBIListener</petalsCDK:jbi-listener-class-name>
</component>
</jbi>{code}
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The component configuration includes the configuration of the CDK. The following parameters correspond to the CDK configuration.
{include:0 CDK Component Configuration Table 2.1}
{include:0 CDK Parameter scope}
{include:0 CDK Component Interceptor configuration}
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This component does not have any specific configuration parameter.
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