/*
* 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.apache.aries.subsystem.core.internal;
import java.util.EnumSet;
import org.osgi.service.subsystem.Subsystem.State;
public class UninstallAction extends AbstractAction {
public UninstallAction(BasicSubsystem requestor, BasicSubsystem target, boolean disableRootCheck) {
super(requestor, target, disableRootCheck);
}
@Override
public Object run() {
// Protect against re-entry now that cycles are supported.
if (!Activator.getInstance().getLockingStrategy().set(State.UNINSTALLING, target)) {
return null;
}
try {
// Acquire the global write lock to prevent all other operations
// until the uninstall is complete. There is no need to hold any
// other locks.
Activator.getInstance().getLockingStrategy().writeLock();
try {
checkRoot();
checkValid();
State state = target.getState();
if (EnumSet.of(State.UNINSTALLED).contains(state)) {
return null;
}
if (state.equals(State.ACTIVE)) {
new StopAction(requestor, target, disableRootCheck).run();
}
ResourceUninstaller.newInstance(requestor, target).uninstall();
}
finally {
// Release the global write lock.
Activator.getInstance().getLockingStrategy().writeUnlock();
}
}
finally {
// Protection against re-entry no longer required.
Activator.getInstance().getLockingStrategy().unset(State.UNINSTALLING, target);
}
return null;
}
}