/*
* 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.controller;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.FAILED;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.FAILURE_DESCRIPTION;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OP_ADDR;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.OUTCOME;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.RESPONSE_HEADERS;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.RESULT;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.SERVER_GROUPS;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import org.jboss.as.controller.client.MessageSeverity;
import org.jboss.as.controller.client.OperationAttachments;
import org.jboss.as.controller.client.OperationMessageHandler;
import org.jboss.as.controller.transform.OperationResultTransformer;
import org.jboss.as.controller.transform.OperationTransformer;
import org.jboss.dmr.ModelNode;
/**
* Step handler that uses a proxied {@link ModelController} to execute the step.
*
* @author Brian Stansberry (c) 2011 Red Hat Inc.
*/
public class ProxyStepHandler implements OperationStepHandler {
private final ProxyController proxyController;
public ProxyStepHandler(final ProxyController proxyController) {
this.proxyController = proxyController;
}
@Override
public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
OperationMessageHandler messageHandler = new DelegatingMessageHandler(context);
final AtomicReference<ModelController.OperationTransaction> txRef = new AtomicReference<ModelController.OperationTransaction>();
final AtomicReference<ModelNode> preparedResultRef = new AtomicReference<ModelNode>();
final AtomicReference<ModelNode> finalResultRef = new AtomicReference<ModelNode>();
final ProxyController.ProxyOperationControl proxyControl = new ProxyController.ProxyOperationControl() {
@Override
public void operationPrepared(ModelController.OperationTransaction transaction, ModelNode result) {
txRef.set(transaction);
preparedResultRef.set(result);
}
@Override
public void operationFailed(ModelNode response) {
finalResultRef.set(response);
}
@Override
public void operationCompleted(ModelNode response) {
finalResultRef.set(response);
}
};
// Transform the operation if needed
if(proxyController instanceof TransformingProxyController) {
final TransformingProxyController transformingProxyController = (TransformingProxyController) proxyController;
final OperationTransformer.TransformedOperation result = transformingProxyController.transformOperation(context, operation);
final ModelNode transformedOperation = result.getTransformedOperation();
final OperationResultTransformer resultTransformer = result.getResultTransformer();
if(transformedOperation != null) {
final ProxyController.ProxyOperationControl transformingProxyControl = new ProxyController.ProxyOperationControl() {
@Override
public void operationFailed(final ModelNode response) {
final ModelNode transformed;
// Check if we can provide a better error message
if(result.rejectOperation(response)) {
final ModelNode newResponse = new ModelNode();
newResponse.get(OUTCOME).set(FAILED);
newResponse.get(FAILURE_DESCRIPTION).set(result.getFailureDescription());
transformed = newResponse;
} else {
transformed = response;
}
final ModelNode result = resultTransformer.transformResult(transformed);
proxyControl.operationFailed(result);
}
@Override
public void operationCompleted(ModelNode response) {
final ModelNode result = resultTransformer.transformResult(response);
proxyControl.operationCompleted(result);
}
@Override
public void operationPrepared(ModelController.OperationTransaction transaction, ModelNode response) {
final ModelNode transformed;
// Check if we have to reject the operation
if(result.rejectOperation(response)) {
final ModelNode newResponse = new ModelNode();
newResponse.get(OUTCOME).set(FAILED);
newResponse.get(FAILURE_DESCRIPTION).set(result.getFailureDescription());
transformed = newResponse;
} else {
transformed = response;
}
proxyControl.operationPrepared(transaction, transformed);
}
};
proxyController.execute(transformedOperation, messageHandler, transformingProxyControl, new DelegatingOperationAttachments(context));
} else {
// discard the operation
final ModelNode transformedResult = resultTransformer.transformResult(new ModelNode());
if(transformedResult != null) {
context.getResult().set(transformedResult);
}
context.completeStep(OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER);
return;
}
} else {
proxyController.execute(operation, messageHandler, proxyControl, new DelegatingOperationAttachments(context));
}
ModelNode finalResult = finalResultRef.get();
if (finalResult != null) {
// operation failed before it could commit
context.getResult().set(finalResult.get(RESULT));
context.getFailureDescription().set(finalResult.get(FAILURE_DESCRIPTION));
if (finalResult.hasDefined(RESPONSE_HEADERS)) {
context.getResponseHeaders().set(finalResult.get(RESPONSE_HEADERS));
}
context.completeStep(OperationContext.RollbackHandler.NOOP_ROLLBACK_HANDLER);
} else {
completeRemoteTransaction(context, operation, txRef, preparedResultRef, finalResultRef);
}
}
private void completeRemoteTransaction(OperationContext context, ModelNode operation, final AtomicReference<ModelController.OperationTransaction> txRef,
final AtomicReference<ModelNode> preparedResultRef, final AtomicReference<ModelNode> finalResultRef) {
boolean completeStepCalled = false;
try {
ModelNode preparedResponse = preparedResultRef.get();
ModelNode preparedResult = preparedResponse.get(RESULT);
if (preparedResponse.hasDefined(FAILURE_DESCRIPTION)) {
context.getFailureDescription().set(preparedResponse.get(FAILURE_DESCRIPTION));
if (preparedResult.isDefined()) {
context.getResult().set(preparedResult);
}
}
else {
context.getResult().set(preparedResult);
}
context.completeStep(new OperationContext.ResultHandler() {
@Override
public void handleResult(OperationContext.ResultAction resultAction, OperationContext context, ModelNode operation) {
boolean txCompleted = false;
try {
ModelController.OperationTransaction tx = txRef.get();
try {
if (resultAction == OperationContext.ResultAction.KEEP) {
tx.commit();
} else {
tx.rollback();
}
} finally {
txCompleted = true;
}
// Get the final result from the proxy and use it to update our response.
// Per the ProxyOperationControl contract, this will have been provided via operationCompleted
// by the time the call to OperationTransaction.commit/rollback returns
ModelNode finalResponse = finalResultRef.get();
if (finalResponse != null) {
ModelNode finalResult = finalResponse.get(RESULT);
if (finalResponse.hasDefined(FAILURE_DESCRIPTION)) {
context.getFailureDescription().set(finalResponse.get(FAILURE_DESCRIPTION));
if (finalResult.isDefined()) {
context.getResult().set(finalResult);
}
} else {
context.getResult().set(finalResult);
}
if (context.getProcessType() == ProcessType.HOST_CONTROLLER && finalResponse.has(SERVER_GROUPS)) {
context.getServerResults().set(finalResponse.get(SERVER_GROUPS));
}
if (finalResponse.hasDefined(RESPONSE_HEADERS)) {
context.getResponseHeaders().set(finalResponse.get(RESPONSE_HEADERS));
}
} else {
// This is an error condition
ControllerLogger.SERVER_MANAGEMENT_LOGGER.noFinalProxyOutcomeReceived(operation.get(OP),
operation.get(OP_ADDR), proxyController.getProxyNodeAddress().toModelNode());
}
} finally {
// Ensure the remote side gets a transaction outcome if we can't commit/rollback above
if (!txCompleted && txRef.get() != null) {
txRef.get().rollback();
}
}
}
});
completeStepCalled = true;
} finally {
// Ensure the remote side gets a transaction outcome if we can't call completeStep above
if (!completeStepCalled && txRef.get() != null) {
txRef.get().rollback();
}
}
}
private static class DelegatingMessageHandler implements OperationMessageHandler {
private final OperationContext context;
DelegatingMessageHandler(final OperationContext context) {
this.context = context;
}
@Override
public void handleReport(MessageSeverity severity, String message) {
context.report(severity, message);
}
}
private static class DelegatingOperationAttachments implements OperationAttachments {
private final OperationContext context;
private DelegatingOperationAttachments(final OperationContext context) {
this.context = context;
}
@Override
public boolean isAutoCloseStreams() {
return false;
}
@Override
public List<InputStream> getInputStreams() {
int count = context.getAttachmentStreamCount();
List<InputStream> result = new ArrayList<InputStream>(count);
for (int i = 0; i < count; i++) {
result.add(context.getAttachmentStream(i));
}
return result;
}
@Override
public void close() throws IOException {
//
}
}
}