111 lines
4.7 KiB
Java
111 lines
4.7 KiB
Java
/*
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* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.management.snmp.util;
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import com.sun.jmx.mbeanserver.Util;
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import com.sun.jmx.snmp.agent.SnmpUserDataFactory;
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import com.sun.jmx.snmp.SnmpPdu;
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import com.sun.jmx.snmp.SnmpStatusException;
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import java.util.Collections;
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import java.util.HashMap;
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import java.util.Map;
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public class JvmContextFactory implements SnmpUserDataFactory {
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/**
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* Called by the <CODE>SnmpAdaptorServer</CODE> adaptor.
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* Allocate a contextual object containing some user data. This method
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* is called once for each incoming SNMP request. The scope
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* of this object will be the whole request. Since the request can be
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* handled in several threads, the user should make sure that this
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* object can be accessed in a thread-safe manner. The SNMP framework
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* will never access this object directly - it will simply pass
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* it to the <code>SnmpMibAgent</code> within
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* <code>SnmpMibRequest</code> objects - from where it can be retrieved
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* through the {@link com.sun.jmx.snmp.agent.SnmpMibRequest#getUserData() getUserData()} accessor.
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* <code>null</code> is considered to be a valid return value.
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*
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* This method is called just after the SnmpPduPacket has been
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* decoded.
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*
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* @param requestPdu The SnmpPduPacket received from the SNMP manager.
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* <b>This parameter is owned by the SNMP framework and must be
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* considered as transient.</b> If you wish to keep some of its
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* content after this method returns (by storing it in the
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* returned object for instance) you should clone that
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* information.
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*
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* @return A newly allocated user-data contextual object, or
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* <code>null</code>
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* @exception SnmpStatusException If an SnmpStatusException is thrown,
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* the request will be aborted.
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*
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* @since Java DMK 5.0
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**/
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public Object allocateUserData(SnmpPdu requestPdu)
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throws SnmpStatusException {
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return Collections.synchronizedMap(new HashMap<Object, Object>());
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}
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/**
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* Called by the <CODE>SnmpAdaptorServer</CODE> adaptor.
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* Release a previously allocated contextual object containing user-data.
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* This method is called just before the responsePdu is sent back to the
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* manager. It gives the user a chance to alter the responsePdu packet
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* before it is encoded, and to free any resources that might have
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* been allocated when creating the contextual object.
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*
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* @param userData The contextual object being released.
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* @param responsePdu The SnmpPduPacket that will be sent back to the
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* SNMP manager.
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* <b>This parameter is owned by the SNMP framework and must be
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* considered as transient.</b> If you wish to keep some of its
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* content after this method returns you should clone that
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* information.
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*
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* @exception SnmpStatusException If an SnmpStatusException is thrown,
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* the responsePdu is dropped and nothing is returned to
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* to the manager.
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*
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* @since Java DMK 5.0
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**/
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public void releaseUserData(Object userData, SnmpPdu responsePdu)
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throws SnmpStatusException {
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((Map<?, ?>)userData).clear();
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}
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public static Map<Object, Object> getUserData() {
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final Object userData =
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com.sun.jmx.snmp.ThreadContext.get("SnmpUserData");
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if (userData instanceof Map<?, ?>) return Util.cast(userData);
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else return null;
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}
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}
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