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/*******************************************************************************
* Copyright (c) 2003, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.osgi.framework.adaptor;
import org.osgi.framework.BundleException;
/**
* Bundle Storage interface for managing a persistent storage life
* cycle operation upon a bundle.
*
* <p>This class is used to provide methods to manage a life cycle
* operation on a bundle in persistent storage. BundleOperation objects
* are returned by the FrameworkAdaptor object and are called by OSGi
* to complete the persistent storage life cycle operation.
*
* <p>For example
* <pre>
* Bundle bundle;
* BundleOperation storage = adaptor.installBundle(location, source);
* try {
* bundle = storage.begin();
*
* // Perform some implementation specific work
* // which may fail.
*
* storage.commit(false);
* // bundle has been successfully installed
* } catch (BundleException e) {
* storage.undo();
* throw e; // rethrow the error
* }
* return bundle;
* </pre>
*
*/
public abstract interface BundleOperation {
/**
* Begin the operation on the bundle (install, update, uninstall).
*
* @return BundleData object for the target bundle.
* @throws BundleException If a failure occured modifiying peristent storage.
*/
public abstract BundleData begin() throws BundleException;
/**
* Commit the operation performed.
*
* @param postpone If true, the bundle's persistent
* storage cannot be immediately reclaimed. This may occur if the
* bundle is still exporting a package.
* @throws BundleException If a failure occured modifiying peristent storage.
*/
public abstract void commit(boolean postpone) throws BundleException;
/**
* Undo the change to persistent storage.
* <p>This method can be called before calling commit or if commit
* throws an exception to undo any changes in progress.
*
* @throws BundleException If a failure occured modifiying peristent storage.
*/
public abstract void undo() throws BundleException;
}
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