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Glassfish example source code file (AMXConfigHelper.java)

This example Glassfish source code file (AMXConfigHelper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Glassfish tags/keywords

amxconfighelper, amxconfigproxy, desc_pattern_regex, descriptor, descriptor, long, long, management, map, mbeanattributeinfo, object, set, set, string, string, util

The Glassfish AMXConfigHelper.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2009-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package org.glassfish.admin.amx.intf.config;

import org.glassfish.admin.amx.config.AMXConfigConstants;
import org.glassfish.admin.amx.config.AMXConfigProxy;
import org.glassfish.external.arc.Stability;
import org.glassfish.external.arc.Taxonomy;

import javax.management.Descriptor;
import javax.management.MBeanAttributeInfo;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import static org.glassfish.admin.amx.config.AMXConfigConstants.*;

/**
 * Various shortcut methods for working with AMX config MBeans, particularly attributes and metadata.
 *
 * @author llc
 */
@Taxonomy(stability = Stability.UNCOMMITTED)
public class AMXConfigHelper {
    private final AMXConfigProxy mAMX;

    public AMXConfigHelper(final AMXConfigProxy amx) {
        mAMX = amx;
    }

    /**
     * match all attributes that have a Descriptor field with the specified value.
     * (could be extended to use regexp for value and/or field name).
     *
     * @param amx       the proxy
     * @param fieldName name of the field in the Descriptor for each Attribute
     * @param value     value of the field in the Descriptor for each Attribute
     */
    public Set<String> attributeNamesByDescriptorField(final String fieldName, final String value) {
        final Set<String> attrNames = new HashSet();
        for (final MBeanAttributeInfo attrInfo : mAMX.extra().mbeanInfo().getAttributes()) {
            final Descriptor desc = attrInfo.getDescriptor();
            if (value.equals(desc.getFieldValue(fieldName))) {
                attrNames.add(attrInfo.getName());
            }
        }
        return attrNames;
    }

    /**
     * Get simple attribute names; those that are not Element kind.
     */
    public Set<String> simpleAttributes() {
        //final String elementKind = Element.class.getName();
        final String elementKind = "element";
        final Set<String> elementNames = attributeNamesByDescriptorField(DESC_KIND, elementKind);
        final Set<String> remaining = mAMX.attributeNames();
        remaining.removeAll(elementNames);
        return remaining;
    }

    /**
     * Get simple attributes; those that are not Element kind.
     */
    public Map<String, Object> simpleAttributesMap() {
        return mAMX.attributesMap(simpleAttributes());
    }

    /**
     * Get the JMX Descriptor for an Attribute.
     *
     * @see AMXConfigConstants
     */
    public final Descriptor attributeDescriptor(final String attrName) {
        final MBeanAttributeInfo info = mAMX.extra().attributeInfo(attrName);
        return info == null ? null : info.getDescriptor();
    }

    /**
     * Get the field value for an Attribute and specified field name, if any.
     *
     * @param attrName
     * @param fieldName
     * @see AMXConfigConstants
     */
    public final Object attributeDescriptorField(final String attrName, final String fieldName) {
        final Descriptor desc = attributeDescriptor(attrName);
        return desc == null ? null : desc.getFieldValue(fieldName);
    }

    /**
     * Return the units (if any) for the specified attribute.
     *
     * @param attrName
     */
    public String units(final String attrName) {
        return (String) attributeDescriptorField(attrName, DESC_UNITS);
    }

    /**
     * Return the minimum value (if any) for the specified numeric attribute.
     *
     * @param attrName
     */
    public Long min(final String attrName) {
        return (Long) attributeDescriptorField(attrName, DESC_MIN);
    }

    /**
     * Return the maximum value (if any) for the specified numeric attribute.
     *
     * @param attrName
     */
    public Long max(final String attrName) {
        return (Long) attributeDescriptorField(attrName, DESC_MAX);
    }

    /**
     * Return the dataType (if any) for the specified attribute eg java.lang.Boolean,
     *
     * @param attrName java.lang.Integer, java.lang.Long, java.lang.String
     */
    public String dataType(final String attrName) {
        return (String) attributeDescriptorField(attrName, DESC_DATA_TYPE);
    }

    /**
     * Return the regex pattern (if any) for the specified attribute.
     *
     * @param attrName
     */
    public String regexPattern(final String attrName) {
        return (String) attributeDescriptorField(attrName, DESC_PATTERN_REGEX);
    }

    /**
     * return true if the Attribute is a key value
     *
     * @param attrName
     */
    public boolean key(final String attrName) {
        return Boolean.parseBoolean("" + attributeDescriptorField(attrName, DESC_KEY));
    }

    /**
     * return true if the Attribute may not be null (is required)
     *
     * @param attrName
     */
    public boolean notNull(final String attrName) {
        return Boolean.parseBoolean("" + attributeDescriptorField(attrName, DESC_NOT_NULL));
    }

    /**
     * Return whether the attribute is required.  This can be implied by several
     * different annotations or field; this method checks them all.
     *
     * @param attrName
     */
    public Boolean required(final String attrName) {
        return notNull(attrName) || key(attrName) ||
                Boolean.parseBoolean("" + attributeDescriptorField(attrName, DESC_REQUIRED));
    }

    /**
     * Return the xml name of the attribute.
     *
     * @param attrName
     */
    public String xmlName(final String attrName) {
        return (String) attributeDescriptorField(attrName, DESC_XML_NAME);
    }

    /**
     * Return the default value of the attribute, or null if no default value.
     *
     * @param attrName
     */
    public String defaultValue(final String attrName) {
        return (String) attributeDescriptorField(attrName, DESC_DEFAULT_VALUE);
    }

}










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