StackOperation.java example

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wildfly-master
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 * as indicated by the @author tags. See the copyright.txt file in the
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 *
 * 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
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 *
 * 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
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package org.jboss.as.clustering.jgroups.subsystem;

import java.util.Collections;
import java.util.List;
import java.util.UUID;

import org.jboss.as.clustering.controller.Operation;
import org.jboss.as.controller.OperationDefinition;
import org.jboss.as.controller.OperationFailedException;
import org.jboss.as.controller.SimpleOperationDefinitionBuilder;
import org.jboss.dmr.ModelNode;
import org.jboss.dmr.ModelType;
import org.jgroups.Channel;
import org.jgroups.stack.Protocol;
import org.jgroups.stack.ProtocolStack;
import org.wildfly.clustering.jgroups.spi.ChannelFactory;

/**
 * @author Paul Ferraro
 */
public enum StackOperation implements Operation<ChannelFactory> {

    EXPORT_NATIVE_CONFIGURATION("export-native-configuration", ModelType.STRING) {
        @Override
        public ModelNode execute(ChannelFactory factory) throws OperationFailedException {
            // Create a temporary channel, but don't connect it
            try (Channel channel = factory.createChannel(UUID.randomUUID().toString())) {
                // ProtocolStack.printProtocolSpecAsXML() is very hacky and only works on an uninitialized stack
                List<Protocol> protocols = channel.getProtocolStack().getProtocols();
                Collections.reverse(protocols);
                ProtocolStack stack = new ProtocolStack();
                stack.addProtocols(protocols);
                return new ModelNode(stack.printProtocolSpecAsXML());
            } catch (Exception e) {
                throw new OperationFailedException(e);
            }
        }
    },
    ;
    private final OperationDefinition definition;

    StackOperation(String name, ModelType replyType) {
        this.definition = new SimpleOperationDefinitionBuilder(name, new JGroupsResourceDescriptionResolver(StackResourceDefinition.WILDCARD_PATH)).setReplyType(replyType).setReadOnly().build();
    }

    @Override
    public OperationDefinition getDefinition() {
        return this.definition;
    }
}