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## org.osgi.service.blueprint.reflect
Interface ServiceReferenceMetadata

All Superinterfaces:
  ComponentMetadata, Metadata, NonNullMetadata

All Known Subinterfaces:
  ReferenceListMetadata, ReferenceMetadata

    public interface ServiceReferenceMetadata

extends ComponentMetadata

Metadata for a reference to an OSGi service. This is the base type for `ReferenceListMetadata` and `ReferenceMetadata`.

Version:
  $Revision: 7563 $

Field Summary
`static int` | `AVAILABILITY_MANDATORY` A matching service is required at all times.
`static int` | `AVAILABILITY_OPTIONAL` A matching service is not required to be present.

Fields inherited from interface org.osgi.service.blueprint.reflect.ComponentMetadata
`ACTIVATION_EAGER, ACTIVATION_LAZY`

Method Summary
`int` | `getAvailability()` Return whether or not a matching service is required at all times.
`String` | `getComponentName()` Return the value of the `component-name` attribute of the service reference.
`String` | `getFilter()` Return the filter expression that a matching service must match.
`String` | `getInterface()` Return the name of the interface type that a matching service must support.
`Collection` | `getReferenceListeners()` Return the reference listeners to receive bind and unbind events.

Methods inherited from interface org.osgi.service.blueprint.reflect.ComponentMetadata
`getActivation, getDependsOn, getId`

Field Detail

### AVAILABILITY_MANDATORY

    static final int AVAILABILITY_MANDATORY

  A matching service is required at all times.

  See Also:
    `getAvailability()`, Constant Field Values

### AVAILABILITY_OPTIONAL

    static final int AVAILABILITY_OPTIONAL

  A matching service is not required to be present.

  See Also:
    `getAvailability()`, Constant Field Values

Method Detail

### getAvailability

    int getAvailability()

  Return whether or not a matching service is required at all times. This is specified in the `availability` attribute of the service reference.

  Returns:
    Whether or not a matching service is required at all times.
  See Also:
    `AVAILABILITY_MANDATORY`, `AVAILABILITY_OPTIONAL`

### getInterface

    String getInterface()

  Return the name of the interface type that a matching service must support. This is specified in the `interface` attribute of the service reference.

  Returns:
    The name of the interface type that a matching service must support or `null` when no interface name is specified.

### getComponentName

    String getComponentName()

  Return the value of the `component-name` attribute of the service reference. This specifies the id of a component that is registered in the service registry. This will create an automatic filter, appended with the filter if set, to select this component based on its automatic `id` attribute.

  Returns:
    The value of the `component-name` attribute of the service reference or `null` if the attribute is not specified.

### getFilter

    String getFilter()

  Return the filter expression that a matching service must match. This is specified by the `filter` attribute of the service reference.

  Returns:
    The filter expression that a matching service must match or `null` if a filter is not specified.

### getReferenceListeners

    Collection getReferenceListeners()

  Return the reference listeners to receive bind and unbind events. This is specified by the `reference-listener` elements of the service reference.

  Returns:
    An immutable Collection of `ReferenceListener` objects to receive bind and unbind events. The Collection is empty if no reference listeners are specified for the service reference.

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