org.jboss.as.host.controller.mgmt.HostControllerRegistrationHandler Maven / Gradle / Ivy
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* Copyright 2012, 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.
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package org.jboss.as.host.controller.mgmt;
import static org.jboss.as.controller.descriptions.ModelDescriptionConstants.EXTENSION;
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.OUTCOME;
import static org.jboss.as.host.controller.HostControllerLogger.DOMAIN_LOGGER;
import static org.jboss.as.process.protocol.ProtocolUtils.expectHeader;
import java.io.DataInput;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicBoolean;
import org.jboss.as.controller.ModelController;
import org.jboss.as.controller.ModelVersion;
import org.jboss.as.controller.OperationContext;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.OperationStepHandler;
import org.jboss.as.controller.PathAddress;
import org.jboss.as.controller.PathElement;
import org.jboss.as.controller.RunningMode;
import org.jboss.as.controller.client.OperationAttachments;
import org.jboss.as.controller.client.OperationMessageHandler;
import org.jboss.as.controller.descriptions.ModelDescriptionConstants;
import org.jboss.as.controller.registry.Resource;
import org.jboss.as.controller.remote.TransactionalProtocolClient;
import org.jboss.as.controller.transform.TransformationTarget;
import org.jboss.as.controller.transform.TransformationTargetImpl;
import org.jboss.as.controller.transform.TransformerRegistry;
import org.jboss.as.controller.transform.Transformers;
import org.jboss.as.domain.controller.DomainController;
import org.jboss.as.domain.controller.DomainControllerMessages;
import org.jboss.as.domain.controller.SlaveRegistrationException;
import org.jboss.as.domain.controller.operations.ReadMasterDomainModelHandler;
import org.jboss.as.host.controller.HostControllerMessages;
import org.jboss.as.protocol.ProtocolLogger;
import org.jboss.as.protocol.StreamUtils;
import org.jboss.as.protocol.mgmt.ActiveOperation;
import org.jboss.as.protocol.mgmt.FlushableDataOutput;
import org.jboss.as.protocol.mgmt.ManagementChannelHandler;
import org.jboss.as.protocol.mgmt.ManagementProtocol;
import org.jboss.as.protocol.mgmt.ManagementRequestContext;
import org.jboss.as.protocol.mgmt.ManagementRequestHandler;
import org.jboss.as.protocol.mgmt.ManagementRequestHandlerFactory;
import org.jboss.as.protocol.mgmt.ManagementRequestHeader;
import org.jboss.as.protocol.mgmt.ManagementResponseHeader;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.Property;
import org.jboss.remoting3.Channel;
import org.jboss.remoting3.CloseHandler;
import org.jboss.threads.AsyncFutureTask;
/**
* Handler responsible for the host-controller registration process. This may involve assembling the correct
* {@code ManagementRequestHandlerFactory} based on the version of the host-controller registering.
*
* @author Emanuel Muckenhuber
*/
public class HostControllerRegistrationHandler implements ManagementRequestHandlerFactory {
private static final ModelNode READ_DOMAIN_MODEL = new ModelNode();
static {
READ_DOMAIN_MODEL.get(ModelDescriptionConstants.OP).set(ReadMasterDomainModelHandler.OPERATION_NAME);
READ_DOMAIN_MODEL.get(ModelDescriptionConstants.OP_ADDR).setEmptyList();
READ_DOMAIN_MODEL.protect();
}
private final ManagementChannelHandler handler;
private final OperationExecutor operationExecutor;
private final DomainController domainController;
private final Executor registrations;
private final DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry;
public HostControllerRegistrationHandler(ManagementChannelHandler handler, DomainController domainController, OperationExecutor operationExecutor, Executor registrations, DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry) {
this.handler = handler;
this.operationExecutor = operationExecutor;
this.domainController = domainController;
this.registrations = registrations;
this.runtimeIgnoreTransformationRegistry = runtimeIgnoreTransformationRegistry;
}
@Override
public ManagementRequestHandler resolveHandler(final RequestHandlerChain handlers, final ManagementRequestHeader header) {
if (header.getVersion() != 1) {
// Send subject
handler.getAttachments().attach(TransactionalProtocolClient.SEND_SUBJECT, Boolean.TRUE);
}
final byte operationId = header.getOperationId();
switch (operationId) {
case DomainControllerProtocol.REGISTER_HOST_CONTROLLER_REQUEST: {
// Start the registration process
final RegistrationContext context = new RegistrationContext(domainController.getExtensionRegistry().getTransformerRegistry(), runtimeIgnoreTransformationRegistry);
context.activeOperation = handlers.registerActiveOperation(header.getBatchId(), context, context);
return new InitiateRegistrationHandler();
}
case DomainControllerProtocol.FETCH_DOMAIN_CONFIGURATION_REQUEST: {
// Start the fetch the domain model process
final RegistrationContext context = new RegistrationContext(domainController.getExtensionRegistry().getTransformerRegistry());
context.activeOperation = handlers.registerActiveOperation(header.getBatchId(), context, context);
return new InitiateRegistrationHandler();
}
case DomainControllerProtocol.REQUEST_SUBSYSTEM_VERSIONS:
// register the subsystem versions
return new RegisterSubsystemVersionsHandler();
case DomainControllerProtocol.COMPLETE_HOST_CONTROLLER_REGISTRATION:
// Complete the registration process
return new CompleteRegistrationHandler();
}
return handlers.resolveNext();
}
/**
* wrapper to the DomainController and the underlying {@code ModelController} to execute
* a {@code OperationStepHandler} implementation directly, bypassing normal domain coordination layer.
*/
public interface OperationExecutor {
/**
* Execute the operation.
*
* @param operation operation
* @param handler the message handler
* @param control the transaction control
* @param attachments the operation attachments
* @param step the step to be executed
* @return the result
*/
ModelNode execute(ModelNode operation, OperationMessageHandler handler, ModelController.OperationTransactionControl control, OperationAttachments attachments, OperationStepHandler step);
/**
* Join an existing operation, which is currently being executed.
*
* @param operation the operation
* @param handler the message handler
* @param control the transaction control
* @param attachments the operation attachments
* @param step the step to be executed
* @param permit the operation permit to join
* @return the result
*/
ModelNode joinActiveOperation(ModelNode operation, OperationMessageHandler handler, ModelController.OperationTransactionControl control, OperationAttachments attachments, OperationStepHandler step, int permit);
}
class InitiateRegistrationHandler implements ManagementRequestHandler {
@Override
public void handleRequest(final DataInput input, final ActiveOperation.ResultHandler resultHandler, final ManagementRequestContext context) throws IOException {
expectHeader(input, DomainControllerProtocol.PARAM_HOST_ID);
final String hostName = input.readUTF();
final ModelNode hostInfo = new ModelNode();
hostInfo.readExternal(input);
final RegistrationContext registration = context.getAttachment();
registration.initialize(hostName, hostInfo, context);
if (domainController.getCurrentRunningMode() == RunningMode.ADMIN_ONLY) {
registration.failed(SlaveRegistrationException.ErrorCode.MASTER_IS_ADMIN_ONLY, DomainControllerMessages.MESSAGES.adminOnlyModeCannotAcceptSlaves(RunningMode.ADMIN_ONLY));
return;
}
if (!domainController.getLocalHostInfo().isMasterDomainController()) {
registration.failed(SlaveRegistrationException.ErrorCode.HOST_IS_NOT_MASTER, DomainControllerMessages.MESSAGES.slaveControllerCannotAcceptOtherSlaves());
return;
}
// Read the domain model async, this will block until the registration process is complete
context.executeAsync(new ManagementRequestContext.AsyncTask() {
@Override
public void execute(ManagementRequestContext context) throws Exception {
registration.processRegistration();
}
}, registrations);
}
}
class RegisterSubsystemVersionsHandler implements ManagementRequestHandler {
@Override
public void handleRequest(DataInput input, ActiveOperation.ResultHandler resultHandler, ManagementRequestContext context) throws IOException {
final byte status = input.readByte();
final ModelNode subsystems = new ModelNode();
subsystems.readExternal(input);
final RegistrationContext registration = context.getAttachment();
if(status == DomainControllerProtocol.PARAM_OK) {
registration.setSubsystems(subsystems, context);
} else {
registration.setSubsystems(null, context);
}
}
}
/**
* Handler responsible for completing the registration request.
*/
static class CompleteRegistrationHandler implements ManagementRequestHandler {
@Override
public void handleRequest(final DataInput input, final ActiveOperation.ResultHandler resultHandler, final ManagementRequestContext context) throws IOException {
final byte status = input.readByte();
final String message = input.readUTF(); // Perhaps use message when the host failed
final RegistrationContext registration = context.getAttachment();
// Complete the registration
registration.completeRegistration(context, status == DomainControllerProtocol.PARAM_OK);
}
}
class HostRegistrationStepHandler implements OperationStepHandler {
private final TransformerRegistry transformerRegistry;
private final RegistrationContext registrationContext;
private final DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry;
protected HostRegistrationStepHandler(final TransformerRegistry transformerRegistry, final RegistrationContext registrationContext, final DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry) {
this.registrationContext = registrationContext;
this.transformerRegistry = transformerRegistry;
this.runtimeIgnoreTransformationRegistry = runtimeIgnoreTransformationRegistry;
}
@Override
public void execute(final OperationContext context, final ModelNode operation) throws OperationFailedException {
// First lock the domain controller
context.acquireControllerLock();
// Check with the controller lock held
if(domainController.isHostRegistered(registrationContext.hostName)) {
final String failureDescription = DomainControllerMessages.MESSAGES.slaveAlreadyRegistered(registrationContext.hostName);
registrationContext.failed(SlaveRegistrationException.ErrorCode.HOST_ALREADY_EXISTS, failureDescription);
context.getFailureDescription().set(failureDescription);
context.stepCompleted();
return;
}
// Read the extensions (with recursive true, otherwise the entries are runtime=true - which are going to be ignored for transformation)
final Resource root = context.readResourceFromRoot(PathAddress.EMPTY_ADDRESS.append(PathElement.pathElement(EXTENSION)), true);
// Check the mgmt version
final HostInfo hostInfo = registrationContext.hostInfo;
final int major = hostInfo.getManagementMajorVersion();
final int minor = hostInfo.getManagementMinorVersion();
final int micro = hostInfo.getManagementMicroVersion();
boolean as711 = (major == 1 && minor == 1);
if(as711) {
final OperationFailedException failure = HostControllerMessages.MESSAGES.unsupportedManagementVersionForHost(
major, minor, 1, 2);
registrationContext.failed(failure);
throw failure;
}
// Initialize the transformers
final TransformationTarget target = TransformationTargetImpl.create(transformerRegistry, ModelVersion.create(major, minor, micro),
Collections.emptyMap(), hostInfo, TransformationTarget.TransformationTargetType.HOST, registrationContext.runtimeIgnoreTransformation);
final Transformers transformers = Transformers.Factory.create(target);
try {
SlaveChannelAttachments.attachSlaveInfo(handler.getChannel(), registrationContext.hostName, transformers);
} catch (IOException e) {
throw new OperationFailedException(e.getLocalizedMessage());
}
// Build the extensions list
final ModelNode extensions = new ModelNode();
final Resource transformed = transformers.transformRootResource(context, root);
final Collection resources = transformed.getChildren(EXTENSION);
for(final Resource.ResourceEntry entry : resources) {
extensions.add(entry.getName());
}
if(! extensions.isDefined()) {
throw new OperationFailedException(extensions);
}
// Remotely resolve the subsystem versions and create the transformation
registrationContext.processSubsystems(transformers, extensions);
// Now run the read-domain model operation
final ReadMasterDomainModelHandler handler = new ReadMasterDomainModelHandler(hostInfo.getHostName(), transformers, runtimeIgnoreTransformationRegistry);
context.addStep(READ_DOMAIN_MODEL, handler, OperationContext.Stage.MODEL);
// Complete
context.stepCompleted();
}
}
private class RegistrationContext implements ModelController.OperationTransactionControl, ActiveOperation.CompletedCallback {
private final TransformerRegistry transformerRegistry;
private final DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry;
private final boolean registerOnCompletion;
private volatile String hostName;
private volatile HostInfo hostInfo;
private ManagementRequestContext responseChannel;
private volatile IOTask task;
private volatile boolean failed;
private volatile Transformers transformers;
private ActiveOperation activeOperation;
private final AtomicBoolean completed = new AtomicBoolean();
private volatile DomainControllerRuntimeIgnoreTransformationEntry runtimeIgnoreTransformation;
private RegistrationContext(TransformerRegistry transformerRegistry) {
this(transformerRegistry, null, false);
}
private RegistrationContext(TransformerRegistry transformerRegistry, DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry) {
this(transformerRegistry, runtimeIgnoreTransformationRegistry, true);
}
private RegistrationContext(TransformerRegistry transformerRegistry,
DomainControllerRuntimeIgnoreTransformationRegistry runtimeIgnoreTransformationRegistry,
boolean registerOnCompletion) {
this.transformerRegistry = transformerRegistry;
this.runtimeIgnoreTransformationRegistry = runtimeIgnoreTransformationRegistry;
this.registerOnCompletion = registerOnCompletion;
}
private synchronized void initialize(final String hostName, final ModelNode hostInfo, final ManagementRequestContext responseChannel) {
this.hostName = hostName;
this.hostInfo = HostInfo.fromModelNode(hostInfo);
this.responseChannel = responseChannel;
this.runtimeIgnoreTransformation = DomainControllerRuntimeIgnoreTransformationEntry.create(this.hostInfo, transformerRegistry.getExtensionRegistry());
if (runtimeIgnoreTransformationRegistry != null) {
runtimeIgnoreTransformationRegistry.initializeHost(hostName);
}
}
@Override
public void completed(Void result) {
//
}
@Override
public void failed(Exception e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getClass().getName() + ":" + e.getMessage());
}
@Override
public void cancelled() {
//
}
@Override
public void operationPrepared(final ModelController.OperationTransaction transaction, final ModelNode result) {
if(failed) {
if (runtimeIgnoreTransformationRegistry != null) {
runtimeIgnoreTransformationRegistry.unregisterHost(hostName);
}
transaction.rollback();
} else {
try {
if (registerOnCompletion) {
registerHost(transaction, result);
} else {
// Host just wanted the model; didn't register
sendResultToHost(transaction, result);
}
} catch (SlaveRegistrationException e) {
failed(e.getErrorCode(), e.getErrorMessage());
} catch (Exception e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getClass().getName() + ":" + e.getMessage());
}
if(failed) {
transaction.rollback();
}
}
}
/**
* Process the registration of the slave whose informatin was provided to {@code initialize()}.
*/
private void processRegistration() {
// Check for duplicate registrations
if (domainController.isHostRegistered(hostName)) {
// asynchronously ping the existing host to validate it's still connected
// If not, the ping will remove it and a subsequent attempt by the new host will succeed
// TODO look into doing the ping synchronously
domainController.pingRemoteHost(hostName);
// Quick hack -- wait a bit to let async ping detect a re-registration. This can easily be improved
// via the TODO above
boolean inter = false; // TODO this is not used
try {
Thread.sleep(500);
} catch (InterruptedException e) {
Thread.currentThread().interrupt(); // TODO why not set inter = true and do this in finally?
} finally {
// Now see if the existing registration has been removed
if (domainController.isHostRegistered(hostName)) {
failed(SlaveRegistrationException.ErrorCode.HOST_ALREADY_EXISTS, DomainControllerMessages.MESSAGES.slaveAlreadyRegistered(hostName));
}
}
}
if (!failed) {
try {
// The domain model is going to be sent as part of the prepared notification
final OperationStepHandler handler = new HostRegistrationStepHandler(transformerRegistry, this, runtimeIgnoreTransformationRegistry);
ModelNode result = operationExecutor.execute(READ_DOMAIN_MODEL, OperationMessageHandler.logging, this, OperationAttachments.EMPTY, handler);
if (FAILED.equals(result.get(OUTCOME).asString())) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, result.get(FAILURE_DESCRIPTION).asString());
return;
}
} catch (Exception e) {
failed(e);
return;
}
// Send a registered notification back
sendCompletedMessage();
// Make sure that the host controller gets unregistered when the channel is closed
responseChannel.getChannel().addCloseHandler(new CloseHandler() {
@Override
public void handleClose(Channel closed, IOException exception) {
if (domainController.isHostRegistered(hostName)) {
DOMAIN_LOGGER.lostConnectionToRemoteHost(hostName);
}
domainController.unregisterRemoteHost(hostName, getRemoteConnectionId());
}
});
}
}
/**
* Create the transformers. This will remotely resolve the subsystem versions.
*
* @param extensions the extensions
* @throws OperationFailedException
*/
private void processSubsystems(final Transformers transformers, final ModelNode extensions) throws OperationFailedException {
this.transformers = transformers;
final ModelNode subsystems = executeBlocking(new IOTask() {
@Override
void sendMessage(FlushableDataOutput output) throws IOException {
sendResponse(output, DomainControllerProtocol.PARAM_OK, extensions);
}
});
if(failed) {
throw new OperationFailedException(new ModelNode("failed to setup transformers"));
}
final TransformationTarget target = transformers.getTarget();
for(final Property subsystem : subsystems.asPropertyList()) {
final String subsystemName = subsystem.getName();
final ModelNode version = subsystem.getValue();
target.addSubsystemVersion(subsystemName, ModelVersion.fromString(version.asString()));
}
}
protected void setSubsystems(final ModelNode resolved, final ManagementRequestContext responseChannel) {
this.responseChannel = responseChannel;
completeTask(resolved);
}
/**
* Once the "read-domain-mode" operation is in operationPrepared, send the model back to registering HC.
* When the model was applied successfully on the client, we process registering the proxy in the domain,
* otherwise we rollback.
*
* @param transaction the model controller tx
* @param result the prepared result (domain model)
* @throws SlaveRegistrationException
*/
void registerHost(final ModelController.OperationTransaction transaction, final ModelNode result) throws SlaveRegistrationException {
//
if (sendResultToHost(transaction, result)) return;
synchronized (this) {
Long pingPongId = hostInfo.getRemoteConnectionId();
// Register the slave
domainController.registerRemoteHost(hostName, handler, transformers, pingPongId, runtimeIgnoreTransformation);
// Complete registration
if(! failed) {
transaction.commit();
} else {
transaction.rollback();
return;
}
}
DOMAIN_LOGGER.registeredRemoteSlaveHost(hostName, hostInfo.getPrettyProductName());
}
private boolean sendResultToHost(ModelController.OperationTransaction transaction, final ModelNode result) {
final Boolean registered = executeBlocking(new IOTask() {
@Override
void sendMessage(final FlushableDataOutput output) throws IOException {
sendResponse(output, DomainControllerProtocol.PARAM_OK, result);
}
});
if(! registered) {
transaction.rollback();
return true;
}
return false;
}
void completeRegistration(final ManagementRequestContext responseChannel, boolean commit) {
this.responseChannel = responseChannel;
failed |= ! commit;
completeTask(! failed);
}
void failed(SlaveRegistrationException.ErrorCode errorCode, String message) {
failed(errorCode.getCode(), message);
}
void failed(byte errorCode, String message) {
if(completed.compareAndSet(false, true)) {
failed = true;
final IOTask task = this.task;
if(task != null) {
task.setFailed();
}
try {
sendFailedResponse(responseChannel, errorCode, message);
} catch (IOException e) {
ProtocolLogger.ROOT_LOGGER.debugf(e, "failed to process message");
}
activeOperation.getResultHandler().done(null);
}
}
void sendCompletedMessage() {
if(completed.compareAndSet(false, true)) {
try {
sendResponse(responseChannel, DomainControllerProtocol.PARAM_OK, null);
} catch (IOException e) {
ProtocolLogger.ROOT_LOGGER.debugf(e, "failed to process message");
}
activeOperation.getResultHandler().done(null);
}
}
Long getRemoteConnectionId() {
return hostInfo.getRemoteConnectionId();
}
protected boolean completeTask(Object result) {
synchronized (this) {
if(failed) {
return false;
}
if(task != null) {
return task.completeStep(result);
}
}
return false;
}
/**
* Execute a task and wait for the response.
*
* @param task the task to execute
* @param the response type
* @return the result
*/
protected T executeBlocking(final IOTask task) {
synchronized (this) {
this.task = task;
try {
final ManagementResponseHeader header = ManagementResponseHeader.create(responseChannel.getRequestHeader());
final FlushableDataOutput output = responseChannel.writeMessage(header);
try {
task.sendMessage(output);
} catch (IOException e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getMessage());
throw new IllegalStateException(e);
} finally {
StreamUtils.safeClose(output);
}
} catch (IOException e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getMessage());
throw new IllegalStateException(e);
}
}
try {
return task.get();
} catch (InterruptedException e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getMessage());
throw new IllegalStateException(e);
} catch (ExecutionException e) {
failed(SlaveRegistrationException.ErrorCode.UNKNOWN, e.getMessage());
throw new IllegalStateException(e);
}
}
}
abstract static class IOTask extends AsyncFutureTask {
IOTask() {
super(null);
}
abstract void sendMessage(final FlushableDataOutput output) throws IOException;
@SuppressWarnings("unchecked")
boolean completeStep(Object result) {
return setResult((T) result);
}
boolean setFailed() {
return setFailed(null);
}
}
/**
* Send an operation response.
*
* @param context the request context
* @param responseType the response type
* @param response the operation response
* @throws IOException for any error
*/
static void sendResponse(final ManagementRequestContext context, final byte responseType, final ModelNode response) throws IOException {
final ManagementResponseHeader header = ManagementResponseHeader.create(context.getRequestHeader());
final FlushableDataOutput output = context.writeMessage(header);
try {
sendResponse(output, responseType, response);
} finally {
StreamUtils.safeClose(output);
}
}
static void sendResponse(final FlushableDataOutput output, final byte responseType, final ModelNode response) throws IOException {
// response type
output.writeByte(responseType);
if(response != null) {
// operation result
response.writeExternal(output);
}
// response end
output.writeByte(ManagementProtocol.RESPONSE_END);
output.close();
}
/**
* Send a failed operation response.
*
* @param context the request context
* @param errorCode the error code
* @param message the operation message
* @throws IOException for any error
*/
static void sendFailedResponse(final ManagementRequestContext context, final byte errorCode, final String message) throws IOException {
final ManagementResponseHeader header = ManagementResponseHeader.create(context.getRequestHeader());
final FlushableDataOutput output = context.writeMessage(header);
try {
// This is an error
output.writeByte(DomainControllerProtocol.PARAM_ERROR);
// send error code
output.writeByte(errorCode);
// error message
output.writeUTF(message);
// response end
output.writeByte(ManagementProtocol.RESPONSE_END);
output.close();
} finally {
StreamUtils.safeClose(output);
}
}
}
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