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/*******************************************************************************
* Copyright (c) 2006 Wind River Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.dd.dsf.service;
import java.util.Dictionary;
import org.eclipse.dd.dsf.concurrent.Done;
import org.eclipse.dd.dsf.concurrent.DsfExecutor;
/**
* The inteface that all Riverbed services must implement. It only privides a
* few features to help manage and identify the servies using the OSGI services
* framework.
* <p>
* Each service should register itself with OSGI services framework using
* the BundleContext.registerService() method. And each service should use the
* session ID that it is registering with as one of the service properties. If there
* is more than one instance of the service to be instanciated for a given session,
* additional properties should be used when registering the service to allow clients
* to uniquely identify the services.
* <p>
* By convention, all methods of Riverbed services can be called only on the dispatch
* thread of the Riverbed executor that is associated with the service. If a
* service exposes a method that is to be called on non-dispatch thread, it should
* be documented so.
*
* TODO: Add IStatus error code constants for common service related failures.
*
* @see org.osgi.framework.BundleContext#registerService(String[], Object, Dictionary)
*/
public interface IDsfService {
/**
* Property name for the session-id of this service. This property should be set by
* all Riverbed services when they are registered with OSGI service framework.
*/
static String PROP_SESSION_ID = "org.eclipse.dd.dsf.service.IService.session_id";
/**
* Returns the executor that should be used to call methods of this service.
* @return
*/
DsfExecutor getExecutor();
/**
* Returns a filter string that can be used to uniquely identify this
* service. This filter string should be based on the properties and class
* name, which were used to register this service.
* @see org.osgi.framework.BundleContext#getServiceReferences
*/
String getServiceFilter();
/**
* Performs initialization and registration of the given service. Implementation
* should initialize the service, so that all methods and events belonging to this
* service can be used following the initialization.
* <br>Note: Since service initializaiton should be performed by an external
* logic, if this service depends on other services, the implementaion should
* assume that these services are already present, and if they are not, the
* initializaiton should fail.
* @param done callback to be submitted when the initialization is complete
*/
void initialize(Done done);
/**
* Performs shutdown and de-registration of the given service.
* @param done callback to be submitted when shutdown is complete
*/
void shutdown(Done done);
/**
* Returns the startup order number of this service among services in the same session.
* Implementations should get this number during initialization by calling
* Session.getAndIncrementServiceStartupCounter(). This counter is used to Session
* objects to prioritize the listeners of service events.
* @return startup order number of this service
* @see org.eclipse.dd.dsf.service.DsfSession#getAndIncrementServiceStartupCounter()
*/
int getStartupNumber();
}
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