/* JFox, the OpenSource J2EE Application Server
*
* Copyright (C) 2002 huihoo.org
* Distributable under GNU LGPL license
* See the GNU Lesser General Public License for more details.
*/
package javax.management.openmbean;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanAttributeInfo;
/**
* <p>Describes an Open MBean: an Open MBean is recognized as such if
* its {@link javax.management.DynamicMBean#getMBeanInfo()
* getMBeanInfo()} method returns an instance of a class which
* implements the {@link OpenMBeanInfo} interface, typically {@link
* OpenMBeanInfoSupport}.</p>
*
* <p>This interface declares the same methods as the class {@link
* javax.management.MBeanInfo}. A class implementing this interface
* (typically {@link OpenMBeanInfoSupport}) should extend {@link
* javax.management.MBeanInfo}.</p>
*
* <p>The {@link #getAttributes()}, {@link #getOperations()} and
* {@link #getConstructors()} methods of the implementing class should
* return at runtime an array of instances of a subclass of {@link
* MBeanAttributeInfo}, {@link MBeanOperationInfo} or {@link
* MBeanConstructorInfo} respectively which implement the {@link
* OpenMBeanAttributeInfo}, {@link OpenMBeanOperationInfo} or {@link
* OpenMBeanConstructorInfo} interface respectively.
*
* @author <a href="mailto:young_yy@hotmail.org">Young Yang</a>
*/
public interface OpenMBeanInfo {
// Re-declares the methods that are in class MBeanInfo of JMX 1.0
// (methods will be removed when MBeanInfo is made a parent interface of this interface)
/**
* Returns the fully qualified Java class name of the open MBean
* instances this <tt>OpenMBeanInfo</tt> describes.
*
* @return the class name.
*/
public String getClassName() ;
/**
* Returns a human readable description of the type of open MBean
* instances this <tt>OpenMBeanInfo</tt> describes.
*
* @return the description.
*/
public String getDescription() ;
/**
* Returns an array of <tt>OpenMBeanAttributeInfo</tt> instances
* describing each attribute in the open MBean described by this
* <tt>OpenMBeanInfo</tt> instance. Each instance in the returned
* array should actually be a subclass of
* <tt>MBeanAttributeInfo</tt> which implements the
* <tt>OpenMBeanAttributeInfo</tt> interface (typically {@link
* OpenMBeanAttributeInfoSupport}).
*
* @return the attribute array.
*/
public MBeanAttributeInfo[] getAttributes() ;
/**
* Returns an array of <tt>OpenMBeanOperationInfo</tt> instances
* describing each operation in the open MBean described by this
* <tt>OpenMBeanInfo</tt> instance. Each instance in the returned
* array should actually be a subclass of
* <tt>MBeanOperationInfo</tt> which implements the
* <tt>OpenMBeanOperationInfo</tt> interface (typically {@link
* OpenMBeanOperationInfoSupport}).
*
* @return the operation array.
*/
public MBeanOperationInfo[] getOperations() ;
/**
* Returns an array of <tt>OpenMBeanConstructorInfo</tt> instances
* describing each constructor in the open MBean described by this
* <tt>OpenMBeanInfo</tt> instance. Each instance in the returned
* array should actually be a subclass of
* <tt>MBeanConstructorInfo</tt> which implements the
* <tt>OpenMBeanConstructorInfo</tt> interface (typically {@link
* OpenMBeanConstructorInfoSupport}).
*
* @return the constructor array.
*/
public MBeanConstructorInfo[] getConstructors() ;
/**
* Returns an array of <tt>MBeanNotificationInfo</tt> instances
* describing each notification emitted by the open MBean
* described by this <tt>OpenMBeanInfo</tt> instance.
*
* @return the notification array.
*/
public MBeanNotificationInfo[] getNotifications() ;
// commodity methods
//
/**
* Compares the specified <var>obj</var> parameter with this <code>OpenMBeanInfo</code> instance for equality.
* <p>
* Returns <tt>true</tt> if and only if all of the following statements are true:
* <ul>
* <li><var>obj</var> is non null,</li>
* <li><var>obj</var> also implements the <code>OpenMBeanInfo</code> interface,</li>
* <li>their class names are equal</li>
* <li>their infos on attributes, constructors, operations and notifications are equal</li>
* </ul>
* This ensures that this <tt>equals</tt> method works properly for <var>obj</var> parameters which are
* different implementations of the <code>OpenMBeanInfo</code> interface.
* <br>
* @param obj the object to be compared for equality with this <code>OpenMBeanInfo</code> instance;
*
* @return <code>true</code> if the specified object is equal to this <code>OpenMBeanInfo</code> instance.
*/
public boolean equals(Object obj);
/**
* Returns the hash code value for this <code>OpenMBeanInfo</code> instance.
* <p>
* The hash code of an <code>OpenMBeanInfo</code> instance is the sum of the hash codes
* of all elements of information used in <code>equals</code> comparisons
* (ie: its class name, and its infos on attributes, constructors, operations and notifications,
* where the hashCode of each of these arrays is calculated by a call to
* <tt>new java.util.HashSet(java.util.Arrays.asList(this.getSignature)).hashCode()</tt>).
* <p>
* This ensures that <code> t1.equals(t2) </code> implies that <code> t1.hashCode()==t2.hashCode() </code>
* for any two <code>OpenMBeanInfo</code> instances <code>t1</code> and <code>t2</code>,
* as required by the general contract of the method
* {@link <a href="http://java.sun.com/j2se/1.3/docs/api/java/lang/Object.html#hashCode()">
* <code>Object.hashCode</code> </a>}.
* <p>
*
* @return the hash code value for this <code>OpenMBeanInfo</code> instance
*/
public int hashCode();
/**
* Returns a string representation of this <code>OpenMBeanInfo</code> instance.
* <p>
* The string representation consists of the name of this class (ie <code>javax.management.openmbean.OpenMBeanInfo</code>),
* the MBean class name,
* and the string representation of infos on attributes, constructors, operations and notifications of the described MBean.
*
* @return a string representation of this <code>OpenMBeanInfo</code> instance
*/
public String toString();
}
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