org.osgi.service.cm.ConfigurationPlugin Maven / Gradle / Ivy
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/*
* Copyright (c) OSGi Alliance (2001, 2013). All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.osgi.service.cm;
import java.util.Dictionary;
import org.osgi.framework.ServiceReference;
/**
* A service interface for processing configuration dictionary before the
* update.
*
*
* A bundle registers a {@code ConfigurationPlugin} object in order to process
* configuration updates before they reach the Managed Service or Managed
* Service Factory. The Configuration Admin service will detect registrations of
* Configuration Plugin services and must call these services every time before
* it calls the {@code ManagedService} or {@code ManagedServiceFactory}
* {@code updated} method. The Configuration Plugin service thus has the
* opportunity to view and modify the properties before they are passed to the
* Managed Service or Managed Service Factory.
*
*
* Configuration Plugin (plugin) services have full read/write access to all
* configuration information that passes through them.
*
*
* The {@code Integer} {@code service.cmRanking} registration property may be
* specified. Not specifying this registration property, or setting it to
* something other than an {@code Integer}, is the same as setting it to the
* {@code Integer} zero. The {@code service.cmRanking} property determines the
* order in which plugins are invoked. Lower ranked plugins are called before
* higher ranked ones. In the event of more than one plugin having the same
* value of {@code service.cmRanking}, then the Configuration Admin service
* arbitrarily chooses the order in which they are called.
*
*
* By convention, plugins with {@code service.cmRanking < 0} or
* {@code service.cmRanking > 1000} should not make modifications to the
* properties.
*
*
* The Configuration Admin service has the right to hide properties from
* plugins, or to ignore some or all the changes that they make. This might be
* done for security reasons. Any such behavior is entirely implementation
* defined.
*
*
* A plugin may optionally specify a {@code cm.target} registration property
* whose value is the PID of the Managed Service or Managed Service Factory
* whose configuration updates the plugin is intended to intercept. The plugin
* will then only be called with configuration updates that are targeted at the
* Managed Service or Managed Service Factory with the specified PID. Omitting
* the {@code cm.target} registration property means that the plugin is called
* for all configuration updates.
*
* @author $Id: 36cd6f091c1bb1726305702c57845ba419ca0a49 $
*/
public interface ConfigurationPlugin {
/**
* A service property to limit the Managed Service or Managed Service
* Factory configuration dictionaries a Configuration Plugin service
* receives.
*
* This property contains a {@code String[]} of PIDs. A Configuration Admin
* service must call a Configuration Plugin service only when this property
* is not set, or the target service's PID is listed in this property.
*/
public static final String CM_TARGET = "cm.target";
/**
* A service property to specify the order in which plugins are invoked.
*
* This property contains an {@code Integer} ranking of the plugin. Not
* specifying this registration property, or setting it to something other
* than an {@code Integer}, is the same as setting it to the {@code Integer}
* zero. This property determines the order in which plugins are invoked.
* Lower ranked plugins are called before higher ranked ones.
*
* @since 1.2
*/
public static final String CM_RANKING = "service.cmRanking";
/**
* View and possibly modify the a set of configuration properties before
* they are sent to the Managed Service or the Managed Service Factory. The
* Configuration Plugin services are called in increasing order of their
* {@code service.cmRanking} property. If this property is undefined or is a
* non- {@code Integer} type, 0 is used.
*
*
* This method should not modify the properties unless the
* {@code service.cmRanking} of this plugin is in the range
* {@code 0 <= service.cmRanking <= 1000}.
*
* If this method throws any {@code Exception}, the Configuration Admin
* service must catch it and should log it.
*
*
* A Configuration Plugin will only be called for properties from
* configurations that have a location for which the Configuration Plugin
* has permission when security is active. When security is not active, no
* filtering is done.
*
* @param reference reference to the Managed Service or Managed Service
* Factory
* @param properties The configuration properties. This argument must not
* contain the "service.bundleLocation" property. The value of this
* property may be obtained from the
* {@code Configuration.getBundleLocation} method.
*/
public void modifyConfiguration(ServiceReference reference, Dictionary properties);
}