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/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.server.services.net;
import org.jboss.as.controller.AbstractWriteAttributeHandler;
import org.jboss.as.controller.AttributeDefinition;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP_ADDR;
import java.net.UnknownHostException;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.network.SocketBinding;
import org.jboss.dmr.ModelNode;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
/**
* Basic {@code OperationHandler} triggering a 'requireRestart' if a binding attribute is
* changed and the service binding is bound.
*
* @author Emanuel Muckenhuber
*/
abstract class AbstractBindingWriteHandler extends AbstractWriteAttributeHandler {
private static final ServiceName SOCKET_BINDING = SocketBinding.JBOSS_BINDING_NAME;
public AbstractBindingWriteHandler(AttributeDefinition... definitions) {
super(definitions);
}
/**
* Handle the actual runtime change.
*
* @param operation the original operation
* @param attributeName the attribute name
* @param attributeValue the new attribute value
* @param binding the resolved socket binding
* @throws OperationFailedException
*/
abstract void handleRuntimeChange(final ModelNode operation, final String attributeName, final ModelNode attributeValue, final SocketBinding binding) throws OperationFailedException;
/**
* Handle the actual runtime change.
*
* @param operation the original operation
* @param attributeName the attribute name
* @param previousValue the attribute value before the change
* @param binding the resolved socket binding
* @throws OperationFailedException
*/
abstract void handleRuntimeRollback(final ModelNode operation, final String attributeName, final ModelNode previousValue, final SocketBinding binding);
/**
* Indicates if a change requires a reload, regardless of whether the socket-binding was bound or not.
*
* @return {@code true} if a reload is required, {@code false} otherwise
*/
protected boolean requiresRestart() {
return false;
}
@Override
protected boolean applyUpdateToRuntime(final OperationContext context, final ModelNode operation, final String attributeName, final ModelNode resolvedValue,
final ModelNode currentValue, final HandbackHolder handbackHolder) throws OperationFailedException {
final PathAddress address = PathAddress.pathAddress(operation.get(OP_ADDR));
final PathElement element = address.getLastElement();
final String bindingName = element.getValue();
final ModelNode bindingModel = context.readResource(PathAddress.EMPTY_ADDRESS).getModel();
final ServiceController controller = context.getServiceRegistry(true).getRequiredService(SOCKET_BINDING.append(bindingName));
final SocketBinding binding = controller.getState() == ServiceController.State.UP ? SocketBinding.class.cast(controller.getValue()) : null;
final boolean bound = binding != null && binding.isBound();
if (binding == null) {
// existing is not started, so can't update it. Instead reinstall the service
handleBindingReinstall(context, bindingName, bindingModel);
} else if (bound) {
// Cannot edit bound sockets
return true;
} else {
handleRuntimeChange(operation, attributeName, resolvedValue, binding);
}
handbackHolder.setHandback(new RollbackInfo(bindingName, bindingModel, binding));
return requiresRestart();
}
@Override
protected void revertUpdateToRuntime(final OperationContext context, final ModelNode operation, final String attributeName, final ModelNode valueToRestore,
final ModelNode valueToRevert, final RollbackInfo handback) throws OperationFailedException {
if(handback != null) {
// in case the binding wasn't installed
if(handback.revertBinding()) {
revertBindingReinstall(context, handback.bindingName, handback.bindingModel, attributeName, valueToRevert);
} else {
handleRuntimeRollback(operation, attributeName, valueToRevert, handback.binding);
}
}
}
private void handleBindingReinstall(OperationContext context, String bindingName, ModelNode bindingModel) throws OperationFailedException {
context.removeService(SOCKET_BINDING.append(bindingName));
try {
BindingAddHandler.installBindingService(context, bindingModel, bindingName, null);
} catch (UnknownHostException e) {
throw new OperationFailedException(new ModelNode().set(e.toString()));
}
}
private void revertBindingReinstall(OperationContext context, String bindingName, ModelNode bindingModel,
String attributeName, ModelNode previousValue) {
context.removeService(SOCKET_BINDING.append(bindingName));
ModelNode unresolvedConfig = bindingModel.clone();
unresolvedConfig.get(attributeName).set(previousValue);
try {
BindingAddHandler.installBindingService(context, unresolvedConfig, bindingName, null);
} catch (Exception e) {
// Bizarro, as we installed the service before
throw new RuntimeException(e);
}
}
static class RollbackInfo {
private final String bindingName;
private final ModelNode bindingModel;
private final SocketBinding binding;
RollbackInfo(String bindingName, ModelNode bindingModel, SocketBinding binding) {
this.bindingName = bindingName;
this.bindingModel = bindingModel;
this.binding = binding;
}
boolean revertBinding() {
return binding == null;
}
}
}
