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Declaring component types
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<component classname="my.Implementation" name="my-type"> </component> |
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@Component(name="my-type") public class Implementation { // ... } |
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||Attribute name || Required || Default value || ||
| classname | yes | | indicates the implementation class (automatic when using annotations). |
| name | no | implementation class name | specifies the component type name. |
| public \\ (public_factory for annotations) | no | true | specifies if the component type is accessible from others bundle or is private.|
| factory-method \\ (factory_method for annotations) | no | | specifies a static method to call instead of the 'regular' constructor to create POJO objects.|
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Creating component instances
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<instance component="my-type"/> <instance component="my.Implementation"/> <instance component="my-type" name="my-instance"/> <instance component="my-type" name="my-instance"> <property name="property1" value="value1"/> </instance> |
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||Attribute name || Required || Default value || ||
| component | yes | | specifies the component type (either by using the name or the class name) |
| name | no | generated | specifies the instance name. |
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- Instances can Instances can contains a configuration given under the
key-value
form. Properties can also by complex type. - How-to use iPOJO factories
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@Component(name="my-type") @Instantiate public class Implementation { // ... } |
Providing services
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<component classname="my.service.implementation" name="my-service-impl"> <provides/> </component> <instance name="my-service-impl"/> |
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@Component @Provides public class Implementation implements FooService { ... } |
- Only instances provides really services, so don't forget to declare an instance.
- Published service interfaces must be implemented by your component implementation
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{div:class=borderedTable} {center} ||Attribute name || Required || Default value || || | specifications | no | all implemented interfaces | specifies the published service interfaces | | strategy | no | {{singleton}} | specifies the service object creation policy among {{singleton}}, {{service}} (OSGi Service Factory), {{method}} (use the factory method), {{instance}} (an object per instance) | {center} {div}Center Attribute name
Required
Default value
specifications
no
all implemented interfaces
specifies the published service interfaces
strategy
no
singleton
specifies the service object creation policy among
singleton
,service
(OSGi Service Factory),method
(use the factory method),instance
(an object per instance) - Providing OSGi services
Publishing service properties
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<component classname="my.service.implementation" name="my-service-impl"> <provides> <property name="foo" field="m_foo" /> <property name="bar" field="m_bar" mandatory="true" /> <property name="baz" type="java.lang.String" /> <!-- Static property (do not change at runtime) --> </provides> </component> <instance name="my-service-impl"> <!-- The configuration has to inject value in unvalued mandatory properties --> <property name="bar" value="5"/> <property name="baz" value="my string"/> <instance/> |
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@Component @Provides(specifications= {FooService.class, BarService.class}, properties= { @StaticServiceProperty(name="baz", type="java.lang.String")}) public class ProvidesProperties implements FooService, BarService { @ServiceProperty(name = "foo") public int m_foo = 0; @ServiceProperty(name="bar", mandatory=true) public int m_bar; // ... } |
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||Attribute name || Required || Default value || ||
| name | no | field name | specifies the published property name |
| mandatory | no | false | specifies if the property has to receive a value from the instance configuration |
| value | no | | specifies the default property value |
| field | no | (automatic with annotations) | specifies the field attached to the service property |
| type | Only if there is no field (generated) | Type of the property |
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Using services with field injection
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<component classname="my.consumer.Implementation"> <requires field="fs" /> <requires field="bs" /> </component> |
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@Component public class Dependency { @Requires public FooService fs; @Requires public BarService[] bs; //... } |
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||Attribute name || Required || Default value || ||
| id | no | field name | dependency id |
| field | no | automatically detected with annotations | injected field |
| optional | no | false | specifies if the dependency if optional |
| aggregate | no | false \\ (automatically detected with fields) | specifies if the dependency is aggregate of {{scalar}} |
| specification | yes/no | can be discovered from the code | specifies the required service specification. This attribute is required when the service type cannot be inferred from the code (Collection type for fields, callbacks without service objects) |
| filter | no | no filter | specifies the dependency LDAP filter |
| from | no | | specifies a specific provider by its name |
| policy | no | {{dynamic}} | specifies the binding policy among {{dynamic}}, {{static}} and {{dynamic-priority}} |
| nullable | no | true | enables/disables nullable object injection for optional dependencies |
| default-implementation // defaultimplementation for annotations | no | | specifies the default-implementation for optional dependencies |
| comparator | no | | specifies the comparator class used to sort service providers |
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Using services with method injection
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<component classname="my.consumer.Implementation"> <requires> <callback type="bind" method="bind" /> <callback type="unbind" method="unbind" /> <callback type="modified" method="modified" /> <!-- for filtered service dependencies, to be notified when a service is modified but still match --> </requires> </component> |
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@Component public class Dependency { @Unbind public synchronized void unbindBaz(BazService bz) { //... } @Bind public synchronized void bindBaz(BazService bz) { // ... } @Modified public synchronized void modifiedBaz() { // ... } //... } |
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||Attribute name || Required || Default value || ||
| id | no | field name | dependency id |
| field | no | automatically detected with annotations | injected field |
| optional | no | false | specifies if the dependency if optional |
| aggregate | no | false \\ (automatically detected with fields) | specifies if the dependnency is aggregate of {{scalar}} |
| specification | yes/no | can be discovered from the code | specifies the required service specification. This attribute is required when the service type cannot be infered from the code (Collection type for fields, callbacks without service objects) |
| filter | no | no filter | specifies the dependency LDAP filter |
| from | no | | specifies a specific provider by its name |
| policy | no | {{dynamic}} | specifies the binding policy among {{dynamic}}, {{static}} and {{dynamic-priority}} |
| nullable | no | true | enables/disables nullable object injection for optional dependencies |
| default-implementation // default implementation for annotations | no | | specifies the default-implementation for optional dependencies |
| comparator | no | | specifies the comparator class used to sort service providers |
|| Sub-Element name || Required || Default value || ||
| callback | no | callback specifies bind and unbind method. Two attributes are required (discovered automatically with annotations). {{type}} specified if the callback is a bind or unbind method (among \{{{bind}}, {{unbind}}, {{modified}}\}. The {{method}} attribute specified the method to call. The {{modified}} callback is called when the service properties of a bound service are modified and the service still match the filter.
{center}
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...
- Thanks to the
requires.from
property, it is possible to override thefrom
attribute value.
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<component classname="...MyComponent" name="FOO"> <requires field="m_foo" id="id1"> <callback type="bind" method="bind"/> <callback type="unbind" method="unbind"/> </requires> </component> <instance name="FOO1" component="FOO"/> <!-- Use the default 'from' value --> <instance name="FOO2" component="FOO"> <property name="requires.from"> <property name="id1" value="myprovider"/> </property> </instance> |
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- Thanks to the
requires.filters
property, it is possible to override thefilter
attribute value.
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<component classname="org.apache.felix.ipojo.example.FilteredDependency" name="FOO"> <requires field="m_foo" fiter="(foo.property=FOO)" id="id1"> <callback type="bind" method="bind"/> <callback type="unbind" method="unbind"/> </requires> </component> <instance name="FOO1" component="FOO"/> <!-- Use the default 'filter' value --> <instance name="FOO2" component="FOO"> <property name="requires.filters"> <property name="id1" value="(foo.property=BAR)"/> </property> </instance> |
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- A POJO object (implementation object) is created as soons as the instance becomes valid
- Instances that don't provide services becomes automatically immediate
Code Block xml xml title XML xml <component classname="my.service.implementation" name="my-service-impl" immediate="true"> <provides/> </component>
Code Block java java title Annotationsjava @Component(immediate=true) @Provides public class Implementation implements FooService { ... } }
Div class borderedTable Center Attribute name
Required
Default value
immediate
no
false // true for instances that don't provide a service
specifies if the instance is immediate or not
Wiki Markup {div:class=borderedTable} {center} ||Attribute name || Required || Default value || || | immediate | no | false // true for instances that don't provide a service | specifies if the instance is immediate or not | {center} {div} - Lifecycle Callback Handler
Lifecycle callbacks
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<component classname="my.implementation" name="my-impl"> <callback transition="validate" method="start" /> <callback transition="invalidate" method="stop" /> </component> |
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@Component public class Implementation { @Validate public void start() { } @Invalidate public void stop() { } } |
...
Declaring properties
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<component classname="my.Implementation" name="my-impl"> <properties propagation="true" managedservice="MyPID"> <property name="boo" method="setBoo" /> <property field="m_bar" mandatory="true"/> <property field="m_foo" value="4"/> </properties> </component> <instance component="my-impl"> <property name="boo" value="..."/> <property name="m_bar" value="..."/> </instance> <instance component="my-impl"> <property name="boo" value="..."/> <property name="m_bar" value="..."/> <property name="managed.service.pid" value="AnotherPID"/> </instance> |
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@Component(managedservice="MyPID", propagation=true) public class Implementation { @Property(name="boo") public void setBoo(int boo) { //... } @Property(mandatory=true) public int m_bar; @Property(value="4") public int m_foo; } |
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||Attribute name || Required || Default value || ||
| propagation | no | false | specifies if the properties propagation (properties are also published as service properties) is enabled or disabled |
| managedservice | no | instance name | specifies the PID of the published managed service. // This value can be overidden by the {{managed.service.pid}} instance property |
| name | no | field name or computed from the method name | specifies if the the property name |
| value | no | | specifies the default property value |
| field | no | automatically detected with annotations | specifies the field in which the property value will be injected |
| method | no | automatically detected with annotations | specifies the setter method in which the property value will be injected |
| mandatory | no | false | specifies if the property has to receive a value from the instance configuration |
{center}
{div} |
PostRegistration and PostUnregistration callbacks
- This feature is part of the provided service handler, and so requires that the component provides a service.
- The callback receives a
ServiceReference
as parameter.Code Block xml xml title XML xml <component classname="..."> <provides post-unregistration="unregistered" post-registration="registered"/> </component>
Code Block java java title Annotationsjava @PostRegistration public void registered(ServiceReference ref) { System.out.println("Registered"); } @PostUnregistration public void unregistered(ServiceReference ref) { System.out.println("Unregistered"); }
- Provided Service Handler
...
- This feature is part of the provided service handler, and so requires that the component provides a service.
- It allows a component to force the un-publication of a service.
Code Block xml xml title XMLxml <component classname="..."> <provides> <controller field="controller" value="false"/> </provides> </component>
Code Block java java title Annotationsjava @ServiceController(value="false") private boolean controller
- Provided Service Handler
...
- Deploy the 'arch' command bundle (available for Felix and Equinox)
- Launch the 'arch' command in the OSGi Framework Shell
Code Block java java title Felix Shelljava arch => displays instances name & state (equivalent to arch \-instances) arch -instance $instance_name => displays complete information about the instance $instance_name arch -factories => display the list of available factories arch -factory $factory_name => display complete information about the factory $factory_name arch -handlers => list available handlers
Code Block java java title Felix Gogojava ipojo:instances => displays instances name & state (equivalent to arch \-instances) ipojo:instance $instance_name => displays complete information about the instance $instance_name ipojo:factories => display the list of available factories ipojo:factory $factory_name => display complete information about the factory $factory_name ipojo:handlers => list available handlers
...
- Temporal dependencies are injected in fields. When accessing to the service, the thread waits for the service availability. If a timeout is reached, a timeout policy is executed.
- Service objects can be injected as
proxies
and be given to collaborator objects. - Temporal dependencies are implemented as an external handlers. To use them, deploy and start the temporal dependency handler bundle.
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<iPOJO xmlns:temporal="org.apache.felix.ipojo.handler.temporal"> <component className="my.Implementation"> <!-- Temporal dependency configuration --> <temporal:requires field="mytemporal"/> <provides/> </component> </iPOJO> |
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import org.apache.felix.ipojo.annotations.Component; import org.apache.felix.ipojo.handler.temporal.Requires; import org.apache.felix.ipojo.test.scenarios.annotations.service.FooService; @Component public class Implementation { @Requires // org.apache.felix.ipojo.handler.temporal.Requires private FooService mytemporal; } |
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||Attribute name || Required || Default value || ||
| field | no | automatically detected with annotations | specifies the field in which the service object will be injected |
| timeout | no | 3000 ms | specifies the timeout value (in ms). When the timeout is reached, the on timeout policy is executed |
| onTimeout | no | Runtime Exception | specifies the on timeout policy. Possible values are: {{null}}, {{nullable}}, {{empty}}, _default-implementation_ (class name) |
| specification | only when using Collections | | specifies the required service specification. This attribute is required when the injected field is a Collection |
| proxy | no | false | enables/disables proxy injection. Service injected as proxies can be given to collaborators |
| filter | no | no filter | Filter use to discover matching filter. |
{center}
{div} |
...
- The event admin handler allows receiving events from the Event Admin.
- The event admin handler is implemented as an external handlers. To use it, deploy and start the event admin handler bundle and an implementation of the event admin service.
- Event (or data) are receive thanks to a callback method.
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<ipojo xmlns:ev="org.apache.felix.ipojo.handlers.event.EventAdminHandler"> <component className="...MyComponent"> <ev:subscriber name="mySubscriber" callback="receive" topics="foo"/> </component> </ipojo> |
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@Component public class MyComponent { @Subscriber(name="s1", data_key="data") public void receive1(Object foo) { // Nothing } @Subscriber(name="s2", topics="foo,bar", filter="(foo=true)") public void receive2(Event foo) { // Nothing } @Subscriber(name="s3", topics="foo", data_key="data", data_type="java.lang.String") public void receive3(String foo) { // Nothing } |
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||Attribute name || Required || Default value || ||
| name | yes | | specifies the name of the event subscriber, acting as a unique identifier. This name is used to configure event subscription in the instance configuration. |
| callback (or method) | yes \\ automatically detected with annotations | | specifies The name of the method called each time an event is received. This method takes only one parameter, of type {{
|
- Instance configuration
- event.topics : overrides
topics
attribute - event.filter : overrides
filter
attribute
- event.topics : overrides
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<instance component="...MyComponent"> <property name="event.topics"> <property name="mySubscriber" value="foo"/> </property> <property name="event.filter"> <property name="mySubscriber" value="|((arg=Minibar)(arg=Coconuts))"/> </property> </instance> |
...
- The event admin handler allows sending events to the Event Admin.
- The event admin handler is implemented as an external handlers. To use it, deploy and start the event admin handler bundle and an implementation of the event admin service.
- To send events, your code must contains a
org.apache.felix.ipojo.handlers.event.publisher.Publisher
field.
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<ipojo xmlns:ev="org.apache.felix.ipojo.handlers.event.EventAdminHandler"> <component className="...MyComponent"> <ev:publisher name="myPublisher" field="m_publisher" topics="bar,nuts"/> </component> <instance component="...MyComponent"/> </ipojo> |
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@Component public class MyComponent { // We use qualified names to avoid conflict. @org.apache.felix.ipojo.handlers.event.Publisher(name="p1", synchronous=true) org.apache.felix.ipojo.handlers.event.publisher.Publisher publisher1; @org.apache.felix.ipojo.handlers.event.Publisher(name="p2", synchronous=false, topics="foo,bar", data_key="data") org.apache.felix.ipojo.handlers.event.publisher.Publisher publisher2; @org.apache.felix.ipojo.handlers.event.Publisher(name="p3", synchronous=true, topics="bar") org.apache.felix.ipojo.handlers.event.publisher.Publisher publisher3; // ... public void doSomething() { Dictionary e = new Properties(); //... // Fill out the event // Send event publisher1.send(e); } } |
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||Attribute name || Required || Default value || ||
| name | yes | | specifies the name of the event publisher, acting as a unique identifier. This name is used to configure event publishing in the instance configuration. |
| field | yes \\ automatically detected with annotations | | specifies The name of the field used to send events. The field is initialized at component instantiation time. The type of the field must be : {{
|
- Instance configuration
- event.topics : overrides
topics
attribute
- event.topics : overrides
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<instance component="...MyComponent"> <property name="event.topics"> <property name="myPublisher" value="foo"/> </property> </instance> |
...
- Allows implementing an
Extender pattern
without handling obscure details - The extender pattern handler is implemented as an external handlers. To use it, deploy and start the external pattern handler bundle.
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<ipojo xmlns:extender="org.apache.felix.ipojo.extender"> <component classname="org.apache.felix.ipojo.extender.Myextender"> <!—Extender Pattern handler configuration --> <extender:extender extension="My-Extension" onArrival="onArrival" onDeparture="onDeparture" /> <callback transition="invalidate" method="stopping" /> <callback transition="validate" method="starting" /> </component> </ipojo> |
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@Component @org.apache.felix.ipojo.extender.Extender(extension="My-Extension", onArrival="onArrival", onDeparture="onDeparture") public class Myextender { public void onArrival(Bundle bundle, String extension) { // handle matching bundle arrival } public void onDeparture(Bundle bundle) { // handler matching bundle departure } } |
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||Attribute name || Required || Default value || ||
| extension | yes | | specifies the required extension
|
Whiteboard Pattern
- Allows implementing a
Whiteboard pattern
without handling obscure details - The whiteboard pattern handler is implemented as an external handlers. To use it, deploy and start the whiteboard pattern handler bundle.
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<ipojo xmlns:wbp="org.apache.felix.ipojo.whiteboard"> <component classname="org.apache.felix.ipojo.test.MyWhiteBoardPattern" > <wbp:wbp filter="(my.property=1)" onArrival="onArrival" onDeparture="onDeparture" onModification="onModification" /> <provides/> </component> |
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@Component @org.apache.felix.ipojo.whiteboard.Wbp(filter="(my.property=1)", onArrival="onArrival", onDeparture="onDeparture", onModification="onModification") public class WhiteBoardWIModification { public void onArrival(ServiceReference ref) { // ... } public void onDeparture(ServiceReference ref) { // ... } public void onModification(ServiceReference ref) { // ... } } |
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{center}
||Attribute name || Required || Default value || ||
| filter | yes | | specifies LDAP filter used to detect required service providers |
| onArrival | yes | | specifies the method called when a matching service provider arrives. The method receives the ServiceReference object |
| onDeparture | yes | | specifies the method called when a matching service provider leaves. The method receives the ServiceReference object |
| omModification | no | | specifies the method called when a matching service provider is modified and is still matching. The method receives the ServiceReference object |
{center} |
- White Board Pattern Handler
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