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How to use iPOJO annotations

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  • specifications: defines the provided interface (optional, default = all implemented interfaces)
  • strategy : the service object creation strategy. Possible values : SINGLETON, SERVICE, METHOD, INSTANCE or the strategy class name. With SINGLETON there is only one POJO per component instance, SERVICE means OSGi Service factory, METHOD delegates the creation to the factory-method of the component, INSTANCE creates one service object per requiring instance. For other strategies, specify the qualified name of the CreationStrategy class. (optional, default = SINGLETON)
  • properties : array containing @StaticServiceProperties defining service properties not attached to fields.

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		<img src="http://people.apache.org/~clement/ipojo/site/information.gif"> <b>OSGi Service Factory</b>
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The <tt>SERVICE</tt> strategy refers to the OSGi service factory. So, one service object per asking bundle will be created.
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		<img src="http://people.apache.org/~clement/ipojo/site/information.gif"> <b>Changes between the 1.0.0 and the 1.2.0</b>
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The <tt>factory</tt> attribute became <tt>strategy</tt>. A third policy is now available (<tt>instance</tt>) allowing to create one service object per asking instance. Moreover, it is also possible to indicates the <tt>CreationStrategy</tt> class name. 
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@Requires

Goal: Defines a service dependency
Target: Field
Attributes:

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  • name: property name (optional, default=field name
  • value: property value (optional, default=no value)
  • mandatory : is the property mandatory? (optional, default=false)

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		<img src="http://people.apache.org/~clement/ipojo/site/information.gif"> <b>Mandatory property</b>
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A mandatory property must receive a value either from the component type description (<tt>value</tt> attribute, or the instance configuration.
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@ServiceController

Goal: Control the service exposition
Target: Field (Boolean)
Attributes:

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  • name: property name (optional, default=field name computed by removing "set" from the method name (for instance setFoo(String ff) will get the Foo name))
  • value: property value (optional, default=no value)
  • mandatory : is the property mandatory? (optional, default=false)

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		<img src="http://people.apache.org/~clement/ipojo/site/information.gif"> <b>Field and Method</b>
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If another property with the same name is defined the method or the field is added to the existing property.
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@Updated

Goal: Defines method called when a reconfiguration is completed.
Target: a method (receiving a dictionary in argument)

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