Package org.osgi.service.cm

Interface Configuration

  • @ProviderType
public interface Configuration
    The configuration information for a ManagedService or ManagedServiceFactory object. The Configuration Admin service uses this interface to represent the configuration information for a ManagedService or for a service instance of a ManagedServiceFactory.

    A Configuration object contains a configuration dictionary and allows the properties to be updated via this object. Bundles wishing to receive configuration dictionaries do not need to use this class - they register a ManagedService or ManagedServiceFactory. Only administrative bundles, and bundles wishing to update their own configurations need to use this class.

    The properties handled in this configuration have case insensitive String objects as keys. However, case must be preserved from the last set key/value.

    A configuration can be bound to a specific bundle or to a region of bundles using the location. In its simplest form the location is the location of the target bundle that registered a Managed Service or a Managed Service Factory. However, if the location starts with ? then the location indicates multiple delivery. In such a case the configuration must be delivered to all targets. If security is on, the Configuration Permission can be used to restrict the targets that receive updates. The Configuration Admin must only update a target when the configuration location matches the location of the target's bundle or the target bundle has a Configuration Permission with the action ConfigurationPermission.TARGET and a name that matches the configuration location. The name in the permission may contain wildcards ( '*') to match the location using the same substring matching rules as Filter. Bundles can always create, manipulate, and be updated from configurations that have a location that matches their bundle location.

    If a configuration's location is null, it is not yet bound to a location. It will become bound to the location of the first bundle that registers a ManagedService or ManagedServiceFactory object with the corresponding PID.

    The same Configuration object is used for configuring both a Managed Service Factory and a Managed Service. When it is important to differentiate between these two the term "factory configuration" is used.

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      void addAttributes​(Configuration.ConfigurationAttribute... attrs)
      Add attributes to the configuration.
      void delete()
      Delete this Configuration object.
      boolean equals​(java.lang.Object other)
      Equality is defined to have equal PIDs Two Configuration objects are equal when their PIDs are equal.
      java.util.Set<Configuration.ConfigurationAttribute> getAttributes()
      Get the attributes of this configuration.
      java.lang.String getBundleLocation()
      Get the bundle location.
      long getChangeCount()
      Get the change count.
      java.lang.String getFactoryPid()
      For a factory configuration return the PID of the corresponding Managed Service Factory, else return null.
      java.lang.String getPid()
      Get the PID for this Configuration object.
      java.util.Dictionary<java.lang.String,​java.lang.Object> getProcessedProperties​(ServiceReference<?> reference)
      Return the processed properties of this Configuration object.
      java.util.Dictionary<java.lang.String,​java.lang.Object> getProperties()
      Return the properties of this Configuration object.
      int hashCode()
      Hash code is based on PID.
      void removeAttributes​(Configuration.ConfigurationAttribute... attrs)
      Remove attributes from this configuration.
      void setBundleLocation​(java.lang.String location)
      Bind this Configuration object to the specified location.
      void update()
      Update the Configuration object with the current properties.
      void update​(java.util.Dictionary<java.lang.String,​?> properties)
      Update the properties of this Configuration object.
      boolean updateIfDifferent​(java.util.Dictionary<java.lang.String,​?> properties)
      Update the properties of this Configuration object if the provided properties are different than the currently stored set.

    • Method Detail

      • getPid

        java.lang.String getPid()
        Get the PID for this Configuration object.
        Returns:
        the PID for this Configuration object.
        Throws:
        java.lang.IllegalStateException - if this configuration has been deleted

      • getProperties

        java.util.Dictionary<java.lang.String,​java.lang.Object> getProperties()
        Return the properties of this Configuration object. The Dictionary object returned is a private copy for the caller and may be changed without influencing the stored configuration. The keys in the returned dictionary are case insensitive and are always of type String.

        If called just after the configuration is created and before update has been called, this method returns null.

        Returns:
        A private copy of the properties for the caller or null. These properties must not contain the "service.bundleLocation" property. The value of this property may be obtained from the getBundleLocation() method.
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.

      • getProcessedProperties

        java.util.Dictionary<java.lang.String,​java.lang.Object> getProcessedProperties​(ServiceReference<?> reference)
        Return the processed properties of this Configuration object.

        The Dictionary object returned is a private copy for the caller and may be changed without influencing the stored configuration. The keys in the returned dictionary are case insensitive and are always of type String.

        Before the properties are returned they are processed by all the registered ConfigurationPlugins handling this configuration.

        If called just after the configuration is created and before update has been called, this method returns null.

        Parameters:
        reference - The reference to the Managed Service or Managed Service Factory to pass to the registered ConfigurationPlugins handling this configuration. Must not be null.
        Returns:
        A private copy of the processed properties for the caller or null. These properties must not contain the "service.bundleLocation" property. The value of this property may be obtained from the getBundleLocation() method.
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.
        Since:
        1.6

      • update

        void update​(java.util.Dictionary<java.lang.String,​?> properties)
     throws java.io.IOException
        Update the properties of this Configuration object.

        Stores the properties in persistent storage after adding or overwriting the following properties:

        • "service.pid" : is set to be the PID of this configuration.
        • "service.factoryPid" : if this is a factory configuration it is set to the factory PID else it is not set.
        These system properties are all of type String.

        If the corresponding Managed Service/Managed Service Factory is registered, its updated method must be called asynchronously. Else, this callback is delayed until aforementioned registration occurs.

        Also notifies all Configuration Listeners with a ConfigurationEvent.CM_UPDATED event.

        Parameters:
        properties - the new set of properties for this configuration
        Throws:
        ReadOnlyConfigurationException - If the configuration is read only.
        java.io.IOException - if update cannot be made persistent
        java.lang.IllegalArgumentException - if the Dictionary object contains invalid configuration types or contains case variants of the same key name.
        java.lang.IllegalStateException - If this configuration has been deleted.

      • delete

        void delete()
     throws java.io.IOException
        Delete this Configuration object.

        Removes this configuration object from the persistent store. Notify asynchronously the corresponding Managed Service or Managed Service Factory. A ManagedService object is notified by a call to its updated method with a null properties argument. A ManagedServiceFactory object is notified by a call to its deleted method.

        Also notifies all Configuration Listeners with a ConfigurationEvent.CM_DELETED event.

        Throws:
        ReadOnlyConfigurationException - If the configuration is read only.
        java.io.IOException - If delete fails.
        java.lang.IllegalStateException - If this configuration has been deleted.

      • getFactoryPid

        java.lang.String getFactoryPid()
        For a factory configuration return the PID of the corresponding Managed Service Factory, else return null.
        Returns:
        factory PID or null
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.

      • update

        void update()
     throws java.io.IOException
        Update the Configuration object with the current properties. Initiate the updated callback to the Managed Service or Managed Service Factory with the current properties asynchronously.

        This is the only way for a bundle that uses a Configuration Plugin service to initiate a callback. For example, when that bundle detects a change that requires an update of the Managed Service or Managed Service Factory via its ConfigurationPlugin object.

        Throws:
        java.io.IOException - if update cannot access the properties in persistent storage
        java.lang.IllegalStateException - If this configuration has been deleted.
        See Also:
        ConfigurationPlugin

      • updateIfDifferent

        boolean updateIfDifferent​(java.util.Dictionary<java.lang.String,​?> properties)
                   throws java.io.IOException
        Update the properties of this Configuration object if the provided properties are different than the currently stored set. Properties are compared as follows.
        • Scalars are compared using equals
        • Arrays are compared using Arrays.equals
        • Collections are compared using equals
        If the new properties are not different than the current properties, no operation is performed. Otherwise, the behavior of this method is identical to the update(Dictionary) method.
        Parameters:
        properties - The new set of properties for this configuration.
        Returns:
        If the properties are different and the configuration is updated true is returned. If the properties are the same, false is returned.
        Throws:
        ReadOnlyConfigurationException - If the configuration is read only.
        java.io.IOException - If update cannot be made persistent.
        java.lang.IllegalArgumentException - If the Dictionary object contains invalid configuration types or contains case variants of the same key name.
        java.lang.IllegalStateException - If this configuration has been deleted.
        Since:
        1.6

      • setBundleLocation

        void setBundleLocation​(java.lang.String location)
        Bind this Configuration object to the specified location. If the location parameter is null then the Configuration object will not be bound to a location/region. It will be set to the bundle's location before the first time a Managed Service/Managed Service Factory receives this Configuration object via the updated method and before any plugins are called. The bundle location or region will be set persistently.

        If the location starts with ? then all targets registered with the given PID must be updated.

        If the location is changed then existing targets must be informed. If they can no longer see this configuration, the configuration must be deleted or updated with null. If this configuration becomes visible then they must be updated with this configuration.

        Also notifies all Configuration Listeners with a ConfigurationEvent.CM_LOCATION_CHANGED event.

        Parameters:
        location - a location, region, or null
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.
        java.lang.SecurityException - when the required permissions are not available

      • getBundleLocation

        java.lang.String getBundleLocation()
        Get the bundle location. Returns the bundle location or region to which this configuration is bound, or null if it is not yet bound to a bundle location or region. If the location starts with ? then the configuration is delivered to all targets and not restricted to a single bundle.
        Returns:
        location to which this configuration is bound, or null.
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.
        java.lang.SecurityException - when the required permissions are not available

      • getChangeCount

        long getChangeCount()
        Get the change count. Each Configuration must maintain a change counter that is incremented with a positive value every time the configuration is updated and its properties are stored. The counter must be incremented before the targets are updated and events are sent out.
        Returns:
        A monotonically increasing value reflecting changes in this Configuration.
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.
        Since:
        1.5

      • addAttributes

        void addAttributes​(Configuration.ConfigurationAttribute... attrs)
            throws java.io.IOException
        Add attributes to the configuration.
        Parameters:
        attrs - The attributes to add.
        Throws:
        java.io.IOException - If the new state cannot be persisted.
        java.lang.IllegalStateException - If this configuration has been deleted.
        java.lang.SecurityException - when the required permissions are not available
        Since:
        1.6

      • getAttributes

        java.util.Set<Configuration.ConfigurationAttribute> getAttributes()
        Get the attributes of this configuration.
        Returns:
        The set of attributes.
        Throws:
        java.lang.IllegalStateException - If this configuration has been deleted.
        Since:
        1.6

      • removeAttributes

        void removeAttributes​(Configuration.ConfigurationAttribute... attrs)
               throws java.io.IOException
        Remove attributes from this configuration.
        Parameters:
        attrs - The attributes to remove.
        Throws:
        java.io.IOException - If the new state cannot be persisted.
        java.lang.IllegalStateException - If this configuration has been deleted.
        java.lang.SecurityException - when the required permissions are not available
        Since:
        1.6

      • equals

        boolean equals​(java.lang.Object other)
        Equality is defined to have equal PIDs Two Configuration objects are equal when their PIDs are equal.
        Overrides:
        equals in class java.lang.Object
        Parameters:
        other - Configuration object to compare against
        Returns:
        true if equal, false if not a Configuration object or one with a different PID.

      • hashCode

        int hashCode()
        Hash code is based on PID. The hash code for two Configuration objects must be the same when the Configuration PID's are the same.
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        hash code for this Configuration object