org.jboss.as.clustering.controller.ReadAttributeTranslationHandler Maven / Gradle / Ivy
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*
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* published by the Free Software Foundation; either version 2.1 of
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*
* This software is distributed in the hope that it will be useful,
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
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* License along with this software; if not, write to the Free
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package org.jboss.as.clustering.controller;
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.registry.ImmutableManagementResourceRegistration;
import org.jboss.as.controller.registry.Resource;
import org.jboss.dmr.ModelNode;
/**
* A read-attribute operation handler that translates a value from another attribute
* @author Paul Ferraro
*/
public class ReadAttributeTranslationHandler implements OperationStepHandler {
private final AttributeTranslation translation;
public ReadAttributeTranslationHandler(AttributeTranslation translation) {
this.translation = translation;
}
@Override
public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
PathAddress currentAddress = context.getCurrentAddress();
PathAddress targetAddress = this.translation.getPathAddressTransformation().apply(currentAddress);
Attribute targetAttribute = this.translation.getTargetAttribute();
ModelNode targetOperation = Operations.createReadAttributeOperation(targetAddress, targetAttribute);
ImmutableManagementResourceRegistration targetRegistration = this.translation.getResourceRegistrationTransformation().apply(context.getResourceRegistration());
OperationStepHandler readAttributeHandler = targetRegistration.getAttributeAccess(PathAddress.EMPTY_ADDRESS, targetAttribute.getName()).getReadHandler();
OperationStepHandler readTranslatedAttributeHandler = new ReadTranslatedAttributeStepHandler(readAttributeHandler, targetAttribute, this.translation.getReadTranslator());
// If targetOperation applies to the current resource, we can execute in the current step
if (targetAddress == currentAddress) {
readTranslatedAttributeHandler.execute(context, targetOperation);
} else {
context.addStep(targetOperation, readTranslatedAttributeHandler, context.getCurrentStage(), true);
}
}
private static class ReadTranslatedAttributeStepHandler implements OperationStepHandler {
private final OperationStepHandler readHandler;
private final Attribute targetAttribute;
private final AttributeValueTranslator translator;
ReadTranslatedAttributeStepHandler(OperationStepHandler readHandler, Attribute targetAttribute, AttributeValueTranslator translator) {
this.readHandler = readHandler;
this.targetAttribute = targetAttribute;
this.translator = translator;
}
@Override
public void execute(OperationContext context, ModelNode operation) throws OperationFailedException {
if (this.readHandler != null) {
this.readHandler.execute(context, operation);
} else {
try {
// If attribute has no read handler, simulate one
ModelNode model = context.readResource(PathAddress.EMPTY_ADDRESS, false).getModel();
ModelNode result = context.getResult();
if (model.hasDefined(this.targetAttribute.getName())) {
result.set(model.get(this.targetAttribute.getName()));
} else if (Operations.isIncludeDefaults(operation)) {
result.set(this.targetAttribute.getDefinition().getDefaultValue());
}
} catch (Resource.NoSuchResourceException ignore) {
// If the target resource does not exist return UNDEFINED
return;
}
}
ModelNode result = context.getResult();
result.set(this.translator.translate(context, result));
}
}
}