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Spring Framework example source code file (AttributesJmxAttributeSource.java)

This example Spring Framework source code file (AttributesJmxAttributeSource.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 - Spring Framework tags/keywords

a, attributesjmxattributesource, bean, collection, collection, invalidmetadataexception, invalidmetadataexception, javabean, managedattribute, managedattribute, managednotification, managedoperation, managedoperationparameter, managedoperationparameter, managedresource, method, reflection, util

The Spring Framework AttributesJmxAttributeSource.java source code

/*
 * Copyright 2002-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jmx.export.metadata;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Iterator;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.metadata.Attributes;
import org.springframework.util.Assert;

/**
 * Implementation of the <code>JmxAttributeSource interface that
 * reads metadata via Spring's <code>Attributes abstraction.
 *
 * <p>Typically used for reading in source-level attributes via
 * Commons Attributes.
 *
 * @author Rob Harrop
 * @since 1.2
 * @see org.springframework.metadata.Attributes
 * @see org.springframework.metadata.commons.CommonsAttributes
 */
public class AttributesJmxAttributeSource implements JmxAttributeSource, InitializingBean {

	/**
	 * Underlying Attributes implementation that we're using.
	 */
	private Attributes attributes;


	/**
	 * Create a new AttributesJmxAttributeSource.
	 * @see #setAttributes
	 */
	public AttributesJmxAttributeSource() {
	}

	/**
	 * Create a new AttributesJmxAttributeSource.
	 * @param attributes the Attributes implementation to use
	 * @see org.springframework.metadata.commons.CommonsAttributes
	 */
	public AttributesJmxAttributeSource(Attributes attributes) {
		if (attributes == null) {
			throw new IllegalArgumentException("Attributes is required");
		}
		this.attributes = attributes;
	}

	/**
	 * Set the Attributes implementation to use.
	 * @see org.springframework.metadata.commons.CommonsAttributes
	 */
	public void setAttributes(Attributes attributes) {
		this.attributes = attributes;
	}

	public void afterPropertiesSet() {
		if (this.attributes == null) {
			throw new IllegalArgumentException("'attributes' is required");
		}
	}


	/**
	 * If the specified class has a <code>ManagedResource attribute,
	 * then it is returned. Otherwise returns null.
	 * @param clazz the class to read the attribute data from
	 * @return the attribute, or <code>null if not found
	 * @throws InvalidMetadataException if more than one attribute exists
	 */
	public ManagedResource getManagedResource(Class clazz) {
		Assert.notNull(this.attributes, "'attributes' is required");
		Collection attrs = this.attributes.getAttributes(clazz, ManagedResource.class);
		if (attrs.isEmpty()) {
			return null;
		}
		else if (attrs.size() == 1) {
			return (ManagedResource) attrs.iterator().next();
		}
		else {
			throw new InvalidMetadataException("A Class can have only one ManagedResource attribute");
		}
	}

	/**
	 * If the specified method has a <code>ManagedAttribute attribute,
	 * then it is returned. Otherwise returns null.
	 * @param method the method to read the attribute data from
	 * @return the attribute, or <code>null if not found
	 * @throws InvalidMetadataException if more than one attribute exists,
	 * or if the supplied method does not represent a JavaBean property
	 */
	public ManagedAttribute getManagedAttribute(Method method) throws InvalidMetadataException {
		Assert.notNull(this.attributes, "'attributes' is required");
		PropertyDescriptor pd = BeanUtils.findPropertyForMethod(method);
		if (pd == null) {
			throw new InvalidMetadataException(
					"The ManagedAttribute attribute is only valid for JavaBean properties: " +
					"use ManagedOperation for methods");
		}
		Collection attrs = this.attributes.getAttributes(method, ManagedAttribute.class);
		if (attrs.isEmpty()) {
			return null;
		}
		else if (attrs.size() == 1) {
			return (ManagedAttribute) attrs.iterator().next();
		}
		else {
			throw new InvalidMetadataException("A Method can have only one ManagedAttribute attribute");
		}
	}

	/**
	 * If the specified method has a <code>ManagedOperation attribute,
	 * then it is returned. Otherwise return null.
	 * @param method the method to read the attribute data from
	 * @return the attribute, or <code>null if not found
	 * @throws InvalidMetadataException if more than one attribute exists,
	 * or if the supplied method represents a JavaBean property
	 */
	public ManagedOperation getManagedOperation(Method method) {
		Assert.notNull(this.attributes, "'attributes' is required");
		PropertyDescriptor pd = BeanUtils.findPropertyForMethod(method);
		if (pd != null) {
			throw new InvalidMetadataException(
					"The ManagedOperation attribute is not valid for JavaBean properties: " +
					"use ManagedAttribute instead");
		}
		Collection attrs = this.attributes.getAttributes(method, ManagedOperation.class);
		if (attrs.isEmpty()) {
			return null;
		}
		else if (attrs.size() == 1) {
			return (ManagedOperation) attrs.iterator().next();
		}
		else {
			throw new InvalidMetadataException("A Method can have only one ManagedAttribute attribute");
		}
	}

	/**
	 * If the specified method has <code>ManagedOperationParameter attributes,
	 * then these are returned, otherwise a zero length array is returned.
	 * @param method the method to get the managed operation parameters for
	 * @return the array of ManagedOperationParameter objects
	 * @throws InvalidMetadataException if the number of ManagedOperationParameter
	 * attributes does not match the number of parameters in the method
	 */
	public ManagedOperationParameter[] getManagedOperationParameters(Method method)
			throws InvalidMetadataException {

		Assert.notNull(this.attributes, "'attributes' is required");
		Collection attrs = this.attributes.getAttributes(method, ManagedOperationParameter.class);
		if (attrs.size() == 0) {
			return new ManagedOperationParameter[0];
		}
		else if (attrs.size() != method.getParameterTypes().length) {
			throw new InvalidMetadataException(
					"Method [" + method + "] has an incorrect number of ManagedOperationParameters specified");
		}
		else {
			ManagedOperationParameter[] params = new ManagedOperationParameter[attrs.size()];
			for (Iterator it = attrs.iterator(); it.hasNext();) {
				ManagedOperationParameter param = (ManagedOperationParameter) it.next();
				if (param.getIndex() < 0 || param.getIndex() >= params.length) {
					throw new InvalidMetadataException(
							"ManagedOperationParameter index for [" + param.getName() + "] is out of bounds");
				}
				params[param.getIndex()] = param;
			}
			return params;
		}
	}

	/**
	 * If the specified has {@link ManagedNotification} attributes these are returned, otherwise
	 * a zero-length array is returned.
	 */
	public ManagedNotification[] getManagedNotifications(Class clazz) {
		Assert.notNull(this.attributes, "'attributes' is required");
		Collection attrs = this.attributes.getAttributes(clazz, ManagedNotification.class);
		return attrs.isEmpty() ? new ManagedNotification[0] : (ManagedNotification[]) attrs.toArray(new ManagedNotification[attrs.size()]);
	}
}

Other Spring Framework examples (source code examples)

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