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Difference between revisions of "SMILA/Documentation/Record Filter"

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Schema: org.eclipse.eilf.datamodel.tools/schemas/RecordFilters.xsd   
 
Schema: org.eclipse.eilf.datamodel.tools/schemas/RecordFilters.xsd   
  
Configuration is a list of filters (tag Filter) identified by attribute "name". Every filter specified copy rules for Attributes/Annotations.
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Configuration is a list of filters (tag Filter) identified by attribute “name”. Every filter specified copy rules for Attributes/Annotations.
  
 
== Configuration Example ==
 
== Configuration Example ==
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Record filter will search first appropriate Filter by name ("only-attributes") specified. If filter not found, then RecordFilterNotFoundException will be thrown.  
 
Record filter will search first appropriate Filter by name ("only-attributes") specified. If filter not found, then RecordFilterNotFoundException will be thrown.  
  
Attribute/Annotation will be copied if correspondent, by name, Attribute/Annotation tag will be found in Filter. Attribute "keepAnnotations" is a flag to copy internal attribute annotations or not.
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Attribute/Annotation will be copied if correspondent, by name, Attribute/Annotation tag Filter will be found. Attribute "keepAnnotations" is a flag to copy internal attribute annotations or not.
  
  
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One Record Filter instance is preloaded by Blackboard service (org.eclipse.eilf.blackboard).   
 
One Record Filter instance is preloaded by Blackboard service (org.eclipse.eilf.blackboard).   
It loads Record Filer configuration from "configuration/org.eclipse.eilf.blackboard/RecordFilters.xml" file and shares following interface methods related to record filtering.
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It loads Record Filer configuration from “configuration/org.eclipse.eilf.blackboard/RecordFilters.xml” file and shares following interface methods related to record filtering.
  
 
<source lang="java">
 
<source lang="java">
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public Record getRecord(final Id id, final String filterName) throws BlackboardAccessException,RecordFilterNotFoundException;
 
public Record getRecord(final Id id, final String filterName) throws BlackboardAccessException,RecordFilterNotFoundException;
 
public Record filterRecord(final Record record, final String filterName) throws RecordFilterNotFoundException;
 
public Record filterRecord(final Record record, final String filterName) throws RecordFilterNotFoundException;
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}
 
</source>
 
</source>
  
 
[[Category:SMILA]]
 
[[Category:SMILA]]

Revision as of 08:03, 20 August 2008

What is Record Filter

Ordinary, Record contains many attributes and annotations but only a few of them are used. To increase productivity, decrease information sent (by SCA) or stored in JMS queue its better to strip unused data. Record filter is a tool that allows to create a copy of Record with only filtered Attributes and Annotations. Configuration with filtering rules should be described as XML.

Configuration

Schema: org.eclipse.eilf.datamodel.tools/schemas/RecordFilters.xsd

Configuration is a list of filters (tag Filter) identified by attribute “name”. Every filter specified copy rules for Attributes/Annotations.

Configuration Example

<RecordFilters>
  <Filter name="only-attributes">
    <Attribute name="*"/>
  </Filter>
  <Filter name="no-filter">
    <Attribute name="*" keepAnnotations="true"/>
    <Annotation name="*"/>
  </Filter>
  <Filter name="nothing"/>
  <Filter name="only-attribute1">
    <Attribute name="attribute1"/>
  </Filter>
  <Filter name="filter-single-and-datetime">
    <Attribute name="single value"/>
    <Attribute name="datetime value"/>
  </Filter>
</RecordFilters>

Sample Usage

Utility class org.eclipse.eilf.datamodel.tools.record.filter.RecordFilterHelper

RecordFilterHelper recordFilterHelper = new RecordFilterHelper(configStream);
Record newRecord = recordFilterHelper.filter(record, "only-attributes");

Record filter will search first appropriate Filter by name ("only-attributes") specified. If filter not found, then RecordFilterNotFoundException will be thrown.

Attribute/Annotation will be copied if correspondent, by name, Attribute/Annotation tag Filter will be found. Attribute "keepAnnotations" is a flag to copy internal attribute annotations or not.


Blackboard Service Record Filter

One Record Filter instance is preloaded by Blackboard service (org.eclipse.eilf.blackboard). It loads Record Filer configuration from “configuration/org.eclipse.eilf.blackboard/RecordFilters.xml” file and shares following interface methods related to record filtering.

public interface BlackboardService {
...
public Record getRecord(final Id id, final String filterName) throws BlackboardAccessException,RecordFilterNotFoundException;
public Record filterRecord(final Record record, final String filterName) throws RecordFilterNotFoundException;
}

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