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Component definition

The service component definition is included in a file called <SERVICE_NAME>.component. SCA components with their associated dependencies can be defined and packaged together into deployable units.

This figure provides a more detailed look at the service component definition. Each service component must have a unique name within the SCA module and it must match the file path relative to the module root. As noted on the previous slide, the service component definition is included in a file called <SERVICE_NAME>.component.

Figure 1. Service component definition including component name, implementation, interfaces, and references

Each service component must have a unique name within the SCA module and it must match the file path relative to the module root. Next, each service component can have one or more interfaces associated with it, which can be either Javaâ„¢ or WSDL port type interface definitions. The interfaces associated with a service component can support either a synchronous or asynchronous interaction style with clients calling the service.

Each service component can be implemented in various ways, specified by the implementation definition. Finally, service components can invoke other service components or imports defined in the current service module. In this case, the appropriate reference must be defined to indicate which service is used. Often this type of reference is in lined in the service component definition, although it may alternatively be placed in the stand-alone references file. Each service component definition can have zero or more references to other services called by the service component being defined.

The following example shows the definition for the StockQuote_MediationFlow component. Notice that the component includes definitions for a WSDL interface, two references, and an implementation.

<?xml version="1.0" encoding="UTF-8"?>
<scdl:component xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"      	
     xmlns:mfc="http://www.ibm.com/xmlns/prod/websphere/scdl/mfc/7.0.0"  	
     xmlns:ns1="http://Resources/StockQuoteService"  	
     xmlns:ns2="http://stockquote.samp.sibx.websphere.ibm.com/DelayedService/"  	
     xmlns:ns3="http://stockquote.samp.sibx.websphere.ibm.com/RealtimeService/"  	
     xmlns:scdl="http://www.ibm.com/xmlns/prod/websphere/scdl/7.0.0"  	
     xmlns:wsdl="http://www.ibm.com/xmlns/prod/websphere/scdl/wsdl/7.0.0"  	
     DisplayName="StockQuote_MediationFlow" name="StockQuote_MediationFlow">  
<interfaces>    
   <interface xsi:type="wsdl:WSDLPortType" portType="ns1:StockQuoteService"/>   
</interfaces>  
<references>    
   <reference name="DelayedServicePortTypePartner">       
     <interface xsi:type="wsdl:WSDLPortType" portType="ns2:DelayedServicePortType">        
        <method name="getQuote"/>      
     </interface>     
     <wire target="DelayedService"/>    
   </reference>     
   <reference name="RealtimeServicePortTypePartner">     
     <interface xsi:type="wsdl:WSDLPortType" portType="ns3:RealtimeServicePortType"> 
        <method name="getQuote"/>       
     </interface>      
     <wire target="RealtimeService"/>     
   </reference>  
</references>  
<implementation xsi:type="mfc:MediationFlowImplementation" mfcFile="StockQuote_MediationFlow.mfc"/>
</Scdl:component>

Service Component Definition Language