I've been chasing this one around for a while, so I thought it time to ask. :)
I have an Adapter service with one implementation OBRAdapter. I can create
instances of the OBRAdaptor without difficulty using the following metadata.xml
<ipojo>
<instance component="com.itslm.omneity.adapter.obr.OBRAdapter">
<property name="scheme" value="obr1"/>
</instance>
<instance component="com.itslm.omneity.adapter.obr.OBRAdapter">
<property name="scheme" value="obr2"/>
</instance>
</ipojo>
Now, although these are 'system supplied' Adapters I want to isolate Adapters
inside a data management component so that user supplied 'plugins' (that will
be picked up programmatically later) have limited access to the rest of the
system. So I created a composite using the following metadata.xml on a
substantially empty jar (with only bundle identity, basically):
<ipojo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="org.apache.felix.ipojo
http://felix.apache.org/ipojo/schemas/SNAPSHOT/core.xsd
org.apache.felix.composite
http://felix.apache.org/ipojo/schemas/SNAPSHOT/composite.xsd";
xmlns="org.apache.felix.ipojo"
xmlns:comp="org.apache.felix.ipojo.composite">
<comp:composite name="DataSourceManager">
<comp:instance
component="com.itslm.omneity.data.service.DataSourceManagerImpl" />
<comp:provides action="export"
specification="com.itslm.omneity.data.api.DataSourceManager" />
<!-- Will programmatically identify and load Adaptor plugins,
this next
entry imports Adapters in the global scope (so, only
those that are in the
main bundle directory)
-->
<comp:subservice action="import" aggregate="true"
specification="com.itslm.omneity.adapter.api.Adapter" />
<comp:subservice action="import"
specification="org.osgi.service.log.LogService" />
</comp:composite>
<comp:instance component="DataSourceManager" name="DataSourceManager" />
</ipojo>
When I examine the running system I see the two Adapters apparently
instantiated and available inside the DataSourceManager component (as I hoped).
g! instance DataSourceManager
instance name="DataSourceManager" state="valid" bundle="38"
component.type="DataSourceManager"
handler name="org.apache.felix.ipojo:instance" state="valid"
instance
factory="com.itslm.omneity.data.service.DataSourceManagerImpl"
name="com.itslm.omneity.data.service.DataSourceManagerImpl-0" state="valid"
handler name="org.apache.felix.ipojo:provides" state="valid"
exports
specification="com.itslm.omneity.data.api.DataSourceManager"
filter="(objectClass=com.itslm.omneity.data.api.DataSourceManager)"
state="resolved"
handler name="org.apache.felix.ipojo:subservice" state="valid"
requires specification="com.itslm.omneity.adapter.api.Adapter"
filter="(&(objectClass=com.itslm.omneity.adapter.api.Adapter)(!(instance.name=DataSourceManager)))"
state="resolved"
provider
name="com.itslm.omneity.adapter.obr.OBRAdapter-0"
provider
name="com.itslm.omneity.adapter.obr.OBRAdapter-1"
requires specification="org.osgi.service.log.LogService"
filter="(&(objectClass=org.osgi.service.log.LogService)(!(instance.name=DataSourceManager)))"
state="resolved"
provider name="null"
handler name="org.apache.felix.ipojo:architecture" state="valid"
services
service
architecture.instance="com.itslm.omneity.data.service.DataSourceManagerImpl-0"
factory.name="architecture" instance.name="architecture-6"
objectclass="[org.apache.felix.ipojo.architecture.Architecture]" service.id="4"
service
factory.name="com.itslm.omneity.data.service.DataSourceManagerImpl"
instance.name="com.itslm.omneity.data.service.DataSourceManagerImpl-0"
objectclass="[com.itslm.omneity.data.api.DataSourceManager,
com.tinkerpop.blueprints.TransactionalGraph,
com.tinkerpop.blueprints.KeyIndexableGraph,
com.tinkerpop.blueprints.IndexableGraph, com.tinkerpop.blueprints.Graph]"
service.id="5"
service factory.name="com.itslm.omneity.adapter.obr.OBRAdapter"
instance.name="com.itslm.omneity.adapter.obr.OBRAdapter-0"
objectclass="[com.itslm.omneity.adapter.api.Adapter]" scheme="obr"
service.id="6"
service factory.name="com.itslm.omneity.adapter.obr.OBRAdapter"
instance.name="com.itslm.omneity.adapter.obr.OBRAdapter-1"
objectclass="[com.itslm.omneity.adapter.api.Adapter]" scheme="obr"
service.id="7"
service objectclass="[org.osgi.service.log.LogService]"
service.id="8"
containedinstances
instance
name="com.itslm.omneity.data.service.DataSourceManagerImpl-0" state="valid"
bundle="36"
component.type="com.itslm.omneity.data.service.DataSourceManagerImpl"
handler name="org.apache.felix.ipojo:requires"
state="valid"
requires
specification="com.itslm.omneity.adapter.api.Adapter"
id="com.itslm.omneity.adapter.api.Adapter" optional="true" nullable="true"
aggregate="true" proxy="false" binding-policy="dynamic" state="resolved"
handler name="org.apache.felix.ipojo:callback"
state="valid"
handler name="org.apache.felix.ipojo:provides"
state="valid"
provides
specifications="[com.itslm.omneity.data.api.DataSourceManager,com.tinkerpop.blueprints.TransactionalGraph,com.tinkerpop.blueprints.KeyIndexableGraph,com.tinkerpop.blueprints.IndexableGraph,com.tinkerpop.blueprints.Graph]"
state="registered" service.id="5"
property name="factory.name"
value="com.itslm.omneity.data.service.DataSourceManagerImpl"
property name="instance.name"
value="com.itslm.omneity.data.service.DataSourceManagerImpl-0"
controller value="true"
handler name="org.apache.felix.ipojo:architecture"
state="valid"
object
name="com.itslm.omneity.data.service.DataSourceManagerImpl@7e266b44"
g!
However, inside the DataSourceManagerImpl I have a @Requires, e.g.
/** All of the Adapter services currently available. */
@Requires(optional = true)
private Adapter[] adapters;
This does what I expect outside the composite (namely, dynamically tracks the
currently available adapters), but inside the composite this field is not
populated (at least not in the start() method where I do a simple
LOGGER.debug("Adapters found: " + adapters.length) as a test. This reports '2'
when running outside the composite, but '0' when running inside the composite.
I know I'm missing (or misunderstanding) something. Can anyone help by
explaining where I'm going wrong? Thanks in advance.
Regards,
Mark
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