/*
* @(#)file SnmpTableSupport.java
* @(#)author Sun Microsystems, Inc.
* @(#)version 1.17
* @(#)date 05/08/26
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.jmx.snmp.agent;
// java imports
//
import java.io.Serializable;
import java.util.Date;
import java.util.Vector;
import java.util.Enumeration;
import java.util.List;
import java.util.ArrayList;
// jmx imports
//
import javax.management.Notification;
import javax.management.ObjectName;
import javax.management.NotificationFilter;
import javax.management.NotificationListener;
import javax.management.NotificationBroadcaster;
import javax.management.MBeanNotificationInfo;
import javax.management.ListenerNotFoundException;
import com.sun.jmx.snmp.SnmpOid;
import com.sun.jmx.snmp.SnmpValue;
import com.sun.jmx.snmp.SnmpVarBind;
import com.sun.jmx.snmp.SnmpStatusException;
/**
* This class is an abstraction for an SNMP table.
* It is the base class for implementing SNMP tables in the
* MBean world.
*
* <p>
* Its responsibility is to synchronize the MBean view of the table
* (Table of entries) with the MIB view (array of OID indexes). Each
* object of this class will be bound to the Metadata object which
* manages the same SNMP Table within the MIB.
* </p>
*
* <p>
* For each table defined in a MIB, mibgen will generate a specific
* class called Table<i>TableName</i> that will subclass this class, and
* a corresponding <i>TableName</i>Meta class extending SnmpMibTable
* and corresponding to the MIB view of the same table.
* </p>
*
* <p>
* Objects of this class are instantiated by MBeans representing
* the SNMP Group to which the table belong.
* </p>
*
* <p><b>This API is a Sun Microsystems internal API and is subject
* to change without notice.</b></p>
* @see com.sun.jmx.snmp.agent.SnmpTableEntryFactory
* @see com.sun.jmx.snmp.agent.SnmpMibTable
*
*/
public abstract class SnmpTableSupport implements SnmpTableEntryFactory,
// NPCTE fix for bugId 4499265, esc 0, MR 04 sept 2001
// SnmpTableCallbackHandler {
SnmpTableCallbackHandler, Serializable {
// end of NPCTE fix for bugId 4499265
//-----------------------------------------------------------------
//
// Protected Variables
//
//-----------------------------------------------------------------
/**
* The list of entries
**/
protected List entries;
/**
* The associated metadata object
**/
protected SnmpMibTable meta;
/**
* The MIB to which this table belongs
**/
protected SnmpMib theMib;
//-----------------------------------------------------------------
//
// Private Variables
//
//-----------------------------------------------------------------
/**
* This variable is initialized while binding this object to its
* corresponding meta object.
**/
private boolean registrationRequired = false;
//-----------------------------------------------------------------
//
// Constructor
//
//-----------------------------------------------------------------
/**
* Initializes the table.
* The steps are these:
* <ul><li> allocate an array for storing entry object,</li>
* <li> retrieve the corresponding metadata object
* from the MIB,
* <li> bind this object to the corresponding metadata object
* from the MIB.</li>
* </ul>
*
* @param mib The MIB to which this table belong.
*
**/
protected SnmpTableSupport(SnmpMib mib) {
theMib = mib;
meta = getRegisteredTableMeta(mib);
bindWithTableMeta();
entries = allocateTable();
}
//-----------------------------------------------------------------
//
// Implementation of the SnmpTableEntryFactory interface
//
//-----------------------------------------------------------------
/**
* Creates a new entry in the table.
*
* This factory method is generated by mibgen and used internally.
* It is part of the
* {@link com.sun.jmx.snmp.agent.SnmpTableEntryFactory} interface.
* You may subclass this method to implement any specific behaviour
* your application requires.
*
* @exception SnmpStatusException if the entry cannot be created.
**/
public abstract void createNewEntry(SnmpMibSubRequest request,
SnmpOid rowOid, int depth,
SnmpMibTable meta)
throws SnmpStatusException;
//-----------------------------------------------------------------
//
// Public methods
//
//-----------------------------------------------------------------
/**
* Returns the entry located at the given position in the table.
*
* @return The entry located at the given position, <code>null</code>
* if no entry can be found at this position.
**/
// XXXX xxxx zzz ZZZZ => public? or protected?
public Object getEntry(int pos) {
if (entries == null) return null;
return entries.get(pos);
}
/**
* Returns the number of entries registered in the table.
*
* @return The number of entries registered in the table.
**/
public int getSize() {
return meta.getSize();
}
/**
* This method lets you dynamically switch the creation policy.
*
* <CODE>setCreationEnabled()</CODE> will switch the policy of
* remote entry creation via SET operations, by calling
* <code>setCreationEnabled()</code> on the metadata object
* associated with this table.
* <BR> By default remote entry creation via SET operation is disabled.
*
* @param remoteCreationFlag Tells whether remote entry creation must
* be enabled or disabled.
* <li>
* <CODE>setCreationEnabled(true)</CODE> will enable remote entry
* creation via SET operations.</li>
* <li>
* <CODE>setCreationEnabled(false)</CODE> will disable remote entry
* creation via SET operations.</li>
* <p> By default remote entry creation via SET operation is disabled.
* </p>
*
* @see com.sun.jmx.snmp.agent.SnmpMibTable
*
**/
public void setCreationEnabled(boolean remoteCreationFlag) {
meta.setCreationEnabled(remoteCreationFlag);
}
/**
* Tells whether a new entry should be created when a SET operation
* is received for an entry that does not exist yet.
* This method calls <code>isCreationEnabled()</code> on the metadata
* object associated with this table.
*
* @return true if a new entry must be created, false otherwise.<br>
* [default: returns <CODE>false</CODE>]
*
* @see com.sun.jmx.snmp.agent.SnmpMibTable
**/
public boolean isCreationEnabled() {
return meta.isCreationEnabled();
}
/**
* Tells whether the metadata object to which this table is linked
* requires entries to be registered. In this case passing an
* ObjectName when registering entries will be mandatory.
*
* @return <code>true</code> if the associated metadata requires entries
* to be registered (mibgen generated generic metadata).
**/
public boolean isRegistrationRequired() {
return registrationRequired;
}
/**
* Builds an entry SnmpIndex from its row OID.
*
* This method is generated by mibgen and used internally.
*
* @param rowOid The SnmpOid object identifying a table entry.
*
* @return The SnmpIndex of the entry identified by <code>rowOid</code>.
*
* @exception SnmpStatusException if the index cannot be built from the
* given OID.
**/
public SnmpIndex buildSnmpIndex(SnmpOid rowOid)
throws SnmpStatusException {
return buildSnmpIndex(rowOid.longValue(false), 0);
}
/**
* Builds an SnmpOid from an SnmpIndex object.
*
* This method is generated by mibgen and used internally.
*
* @param index An SnmpIndex object identifying a table entry.
*
* @return The SnmpOid form of the given entry index.
*
* @exception SnmpStatusException if the given index is not valid.
**/
public abstract SnmpOid buildOidFromIndex(SnmpIndex index)
throws SnmpStatusException;
/**
* Builds the default ObjectName of an entry from the SnmpIndex
* identifying this entry. No access is made on the entry itself.
*
* This method is generated by mibgen and used internally.
* You can subclass this method if you want to change the default
* ObjectName policy. This is only meaningfull when entries
* are registered MBeans.
*
* @param index The SnmpIndex identifying the entry from which we
* want to build the default ObjectName.
*
* @return The default ObjectName for the entry identified by
* the given index.
*
* @exception SnmpStatusException if the given index is not valid.
**/
public abstract ObjectName buildNameFromIndex(SnmpIndex index)
throws SnmpStatusException;
//-----------------------------------------------------------------
//
// Implementation of the SnmpTableEntryFactory interface
//
//-----------------------------------------------------------------
/**
* This callback is called by the associated metadata object
* when a new table entry has been registered in the
* table metadata.
*
* This method will update the <code>entries</code> list.
*
* @param pos The position at which the new entry was inserted
* in the table.
* @param row The row OID of the new entry
* @param name The ObjectName of the new entry (as specified by the
* factory)
* @param entry The new entry (as returned by the factory)
* @param meta The table metadata object.
*
**/
public void addEntryCb(int pos, SnmpOid row, ObjectName name,
Object entry, SnmpMibTable meta)
throws SnmpStatusException {
try {
if (entries != null) entries.add(pos,entry);
} catch (Exception e) {
throw new SnmpStatusException(SnmpStatusException.noSuchName);
}
}
/**
* This callback is called by the associated metadata object
* when a new table entry has been removed from the
* table metadata.
*
* This method will update the <code>entries</code> list.
*
* @param pos The position from which the entry was deleted
* @param row The row OID of the deleted entry
* @param name The ObjectName of the deleted entry (may be null if
* ObjectName's were not required)
* @param entry The deleted entry (may be null if only ObjectName's
* were required)
* @param meta The table metadata object.
*
**/
public void removeEntryCb(int pos, SnmpOid row, ObjectName name,
Object entry, SnmpMibTable meta)
throws SnmpStatusException {
try {
if (entries != null) entries.remove(pos);
} catch (Exception e) {
}
}
/**
* Enables to add an SNMP entry listener to this
* <CODE>SnmpMibTable</CODE>.
*
* @param listener The listener object which will handle the
* notifications emitted by the registered MBean.
*
* @param filter The filter object. If filter is null, no filtering
* will be performed before handling notifications.
*
* @param handback The context to be sent to the listener when a
* notification is emitted.
*
* @exception IllegalArgumentException Listener parameter is null.
*/
public void
addNotificationListener(NotificationListener listener,
NotificationFilter filter, Object handback) {
meta.addNotificationListener(listener,filter,handback);
}
/**
* Enables to remove an SNMP entry listener from this
* <CODE>SnmpMibTable</CODE>.
*
* @param listener The listener object which will handle the
* notifications emitted by the registered MBean.
* This method will remove all the information related to this
* listener.
*
* @exception ListenerNotFoundException The listener is not registered
* in the MBean.
*/
public synchronized void
removeNotificationListener(NotificationListener listener)
throws ListenerNotFoundException {
meta.removeNotificationListener(listener);
}
/**
* Returns a <CODE>NotificationInfo</CODE> object containing the
* notification class and the notification type sent by the
* <CODE>SnmpMibTable</CODE>.
*/
public MBeanNotificationInfo[] getNotificationInfo() {
return meta.getNotificationInfo();
}
//-----------------------------------------------------------------
//
// Protected Abstract methods
//
//-----------------------------------------------------------------
/**
* Builds an SnmpIndex object from the index part of an OID.
*
* This method is generated by mibgen and used internally.
*
* @param oid The OID from which to build the index, represented
* as an array of long.
* @param start The position where to start from in the OID array.
*
* @return The SnmpOid form of the given entry index.
*
* @exception SnmpStatusException if the given index is not valid.
**/
protected abstract SnmpIndex buildSnmpIndex(long oid[], int start )
throws SnmpStatusException;
/**
* Returns the metadata object associated with this table.
*
* This method is generated by mibgen and used internally.
*
* @param mib The SnmpMib object holding the Metadata corresponding
* to this table.
*
* @return The metadata object associated with this table.
* Returns <code>null</code> if this implementation of the
* MIB doesn't support this table.
**/
protected abstract SnmpMibTable getRegisteredTableMeta(SnmpMib mib);
//-----------------------------------------------------------------
//
// Protected methods
//
//-----------------------------------------------------------------
/**
* Allocates an ArrayList for storing table entries.
*
* This method is called within the constructor at object creation.
* Any object implementing the {@link java.util.List} interface can
* be used.
*
* @return A new list in which to store entries. If <code>null</code>
* is returned then no entry will be stored in the list
* and getEntry() will always return null.
**/
protected List allocateTable() {
return new ArrayList();
}
/**
* Add an entry in this table.
*
* This method registers an entry in the table and perform
* synchronization with the associated table metadata object.
*
* This method assumes that the given entry will not be registered,
* or will be registered with its default ObjectName built from the
* associated SnmpIndex.
* <p>
* If the entry is going to be registered, then
* {@link com.sun.jmx.snmp.agent.SnmpTableSupport#addEntry(SnmpIndex, ObjectName, Object)} should be prefered.
* <br> This function is mainly provided for backward compatibility.
*
* @param index The SnmpIndex built from the given entry.
* @param entry The entry that should be added in the table.
*
* @exception SnmpStatusException if the entry cannot be registered with
* the given index.
**/
protected void addEntry(SnmpIndex index, Object entry)
throws SnmpStatusException {
SnmpOid oid = buildOidFromIndex(index);
ObjectName name = null;
if (isRegistrationRequired()) {
name = buildNameFromIndex(index);
}
meta.addEntry(oid,name,entry);
}
/**
* Add an entry in this table.
*
* This method registers an entry in the table and performs
* synchronization with the associated table metadata object.
*
* @param index The SnmpIndex built from the given entry.
* @param name The ObjectName with which this entry will be registered.
* @param entry The entry that should be added in the table.
*
* @exception SnmpStatusException if the entry cannot be registered with
* the given index.
**/
protected void addEntry(SnmpIndex index, ObjectName name, Object entry)
throws SnmpStatusException {
SnmpOid oid = buildOidFromIndex(index);
meta.addEntry(oid,name,entry);
}
/**
* Remove an entry from this table.
*
* This method unregisters an entry from the table and performs
* synchronization with the associated table metadata object.
*
* @param index The SnmpIndex identifying the entry.
* @param entry The entry that should be removed in the table. This
* parameter is optional and can be omitted if it doesn't
* need to be passed along to the
* <code>removeEntryCb()</code> callback defined in the
* {@link com.sun.jmx.snmp.agent.SnmpTableCallbackHandler}
* interface.
*
* @exception SnmpStatusException if the entry cannot be unregistered.
**/
protected void removeEntry(SnmpIndex index, Object entry)
throws SnmpStatusException {
SnmpOid oid = buildOidFromIndex(index);
meta.removeEntry(oid,entry);
}
// protected void removeEntry(ObjectName name, Object entry)
// throws SnmpStatusException {
// meta.removeEntry(name,entry);
// }
/**
* Returns the entries in the table.
*
* @return An Object[] array containing the entries registered in the
* table.
**/
protected Object[] getBasicEntries() {
if (entries == null) return null;
Object[] array= new Object[entries.size()];
entries.toArray(array);
return array;
}
/**
* Binds this table with its associated metadata, registering itself
* as an SnmpTableEntryFactory.
**/
protected void bindWithTableMeta() {
if (meta == null) return;
registrationRequired = meta.isRegistrationRequired();
meta.registerEntryFactory(this);
}
}
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