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/*****************************************************************************
* Copyright (c) CEA LIST.
*
*
* 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:
* Cedric Dumoulin Cedric.dumoulin@lifl.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.core.services.internal;
import org.eclipse.core.runtime.Platform;
import org.eclipse.papyrus.infra.core.services.BadStateException;
import org.eclipse.papyrus.infra.core.services.ServiceDescriptor;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServiceState;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.osgi.framework.Bundle;
/**
* Base class for the different types of service entries (PoJo, Service,
* ServiceFactory, ...).
*
* @author cedric dumoulin
*/
public abstract class ServiceTypeEntry {
/**
* Current state of the service.
*/
protected ServiceState state = ServiceState.registered;
/**
* Descriptor of the service associated to this entry.
*/
protected ServiceDescriptor serviceDescriptor;
/**
*
* Constructor.
*
*/
public ServiceTypeEntry(ServiceDescriptor serviceDescriptor) {
this.serviceDescriptor = serviceDescriptor;
}
/**
* Change the state of the service.
*
* @param newState
*/
protected void setState(ServiceState newState) {
state = newState;
}
/**
* @return the state
*/
public ServiceState getState() {
return state;
}
/**
* Check if the current state is the proposed state. Throws an exception if
* the state is different.
*
* @param expectedState
* @throws BadStateException
*/
protected void checkState(ServiceState expectedState) throws BadStateException {
if(expectedState != state) {
throw new BadStateException(expectedState, state, serviceDescriptor);
}
}
/**
* Get the descriptor of the service associated to this entry.
*
* @return
*/
public ServiceDescriptor getDescriptor() {
return serviceDescriptor;
}
/**
* Instanciate the service as specified in serviceClassname.
*
* @return the created service.
* @throws ServiceException
*/
protected Object instanciateService() throws ServiceException {
// Load the Class of the service
String serviceClassname = serviceDescriptor.getServiceClassname();
Class<?> classname = loadClass();
// Try to get the one arg constructor.
// This require the ServiceRegistry. Old stuff, not more used.
// try {
// Constructor<?> constructor =
// classname.getConstructor(ServicesRegistry.class);
// return constructor.newInstance(registry);
// } catch (SecurityException e) {
// // Do nothing, try next constructor
// } catch (NoSuchMethodException e) {
// // Do nothing, try next constructor
// } catch (IllegalArgumentException e) {
// throw new ServiceException("Can't instanciate '" + serviceClassname +
// "' with args ServicesRegistry.", e);
// } catch (InstantiationException e) {
// throw new ServiceException("Can't instanciate '" + serviceClassname +
// "' with args ServicesRegistry.", e);
// } catch (IllegalAccessException e) {
// throw new ServiceException("Can't instanciate '" + serviceClassname +
// "' with args ServicesRegistry.", e);
// } catch (InvocationTargetException e) {
// throw new ServiceException("Can't instanciate '" + serviceClassname +
// "' with args ServicesRegistry.", e);
// }
// Try with zero arg constructor.
try {
return classname.newInstance();
} catch (SecurityException e) {
throw new ServiceException("Can't instanciate '" + serviceClassname + "' with zero args.", e); //$NON-NLS-1$ //$NON-NLS-2$
} catch (IllegalArgumentException e) {
throw new ServiceException("Can't instanciate '" + serviceClassname + "' with zero args.", e); //$NON-NLS-1$ //$NON-NLS-2$
} catch (InstantiationException e) {
throw new ServiceException("Can't instanciate '" + serviceClassname + "' with zero args.", e); //$NON-NLS-1$ //$NON-NLS-2$
} catch (IllegalAccessException e) {
throw new ServiceException("Can't instanciate '" + serviceClassname + "' with zero args.", e); //$NON-NLS-1$ //$NON-NLS-2$
}
}
/**
* Load the Class object. Try from current ClassLoader, then try using the
* plugin referenced in the serviceDescriptor.PluginId
*
* @return
* @throws ServiceException
*/
private Class<?> loadClass() throws ServiceException {
String serviceClassname = serviceDescriptor.getServiceClassname();
Class<?> serviceClass;
try {
serviceClass = Class.forName(serviceClassname);
} catch (ClassNotFoundException e1) {
// Try using bundle
try {
String bundleID = serviceDescriptor.getClassBundleID();
Bundle bundle = Platform.getBundle(bundleID);
serviceClass = bundle.loadClass(serviceClassname);
} catch (ClassNotFoundException e2) {
throw new ServiceException("Can't find class for the name '" + serviceClassname + "'.", e2); //$NON-NLS-1$ //$NON-NLS-2$
}
}
return serviceClass;
}
/**
* Return true if the service is started. Return false otherwise.
*
* @return
*/
public boolean isStarted() {
return state == ServiceState.started;
}
/**
* Get the service instance.
*
* @return
* @throws ServiceException
*/
abstract public Object getServiceInstance() throws ServiceException;
/**
* Create the associated service if not a Lazy Service.
*
* @throws ServiceException
*/
abstract public void createService() throws ServiceException;
/**
* Start the associated service if not a Lazy Service.
*
* @param servicesRegistry
* The servicesRegistry containing this service.
*
* @throws ServiceException
*/
abstract public void initService(ServicesRegistry servicesRegistry) throws ServiceException;
/**
* Start the associated service if not a Lazy Service.
*
* @throws ServiceException
*/
abstract public void startService() throws ServiceException;
/**
* Dispose associated service.
*/
abstract public void disposeService() throws ServiceException;
}
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