org.snmp4j.agent.request.Request Maven / Gradle / Ivy
/*_############################################################################
_##
_## SNMP4J-Agent 3 - Request.java
_##
_## Copyright (C) 2005-2021 Frank Fock (SNMP4J.org)
_##
_## 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.snmp4j.agent.request;
import org.snmp4j.smi.OID;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.snmp4j.smi.OctetString;
// JavaDoc
import org.snmp4j.agent.ManagedObject;
/**
* The {@code Request} interface defines common elements of SNMP related
* operation requests.
*
* @param source object that trigger the {@link Request} creation.
* @param the response object returned by this {@link Request}.
* @param the {@link SubRequest} sub-type used to process this request.
*
* @author Frank Fock
* @version 1.2
*/
public interface Request> {
int PHASE_INIT = -1;
int PHASE_1PC = 0;
int PHASE_2PC_PREPARE = 1;
int PHASE_2PC_COMMIT = 2;
int PHASE_2PC_UNDO = 3;
int PHASE_2PC_CLEANUP = 4;
/**
* Finds the first sub-request whose OID starts with the supplied one.
* @param prefix
* the OID prefix of the sub-request OID.
* @return
* the first {@code SubRequest} instance of this request whose OID
* starts with {@code prefix}. If no such sub-request exits
* {@code null} is returned.
*/
U find(OID prefix);
/**
* Returns the response object for this request.
* @return
* an object containing the response for this request.
*/
R getResponse();
/**
* Checks whether the response for this request is complete.
* @return
* {@code true} if all required data has been collected to create
* a response for this request, {@code false} otherwise.
*/
boolean isComplete();
/**
* Checks whether the current phase is complete.
* @return
* {@code true} if all required processing has been finished for
* the current request phase. For single phase request types this method
* returns the same result as {@link #isComplete()}.
*/
boolean isPhaseComplete();
/**
* Returns the initiating event object for the request.
* @return
* an {@code Object} instance on whose behalf this request
* has been initiated.
*/
S getSource();
/**
* Gets the context of the request.
* @return
* an {@code OctetString} instance.
*/
OctetString getContext();
/**
* Gets the sub-request at the specified index.
* @param index
* an index {@code >= 0 and < size()}
* @return
* a {@code SnmpSubRequest} instance.
*/
U get(int index);
/**
* Gets the number of sub-requests in this request. For GETBULK requests
* this number may increase over time.
* @return
* a positive integer (greater or equal to zero).
*/
int size();
/**
* Gets the phase identifier of the current Two-Phase-Commit (2PC) phase of
* this request.
* @return
* a 2PC identifier
*/
int getPhase();
/**
* Initializes next phase and returns its identifier.
* @return
* a phase identifier.
* @throws NoSuchElementException if there is no next phase for this type
* of request.
*/
int nextPhase() throws NoSuchElementException;
/**
* Sets the request phase.
* @param phase
* a phase identifier.
* @throws NoSuchElementException if there is no such phase for this type
* of request.
*/
void setPhase(int phase) throws NoSuchElementException;
/**
* Returns an {@code Iterator} over the sub-requests of this request.
* @return
* an {@code Iterator}
*/
Iterator iterator();
void setViewName(OctetString viewName);
OctetString getViewName();
OctetString getSecurityName();
int getMessageProcessingModel();
int getSecurityModel();
int getSecurityLevel();
int getViewType();
void setErrorStatus(int errorStatus);
int getErrorStatus();
int getErrorIndex();
int getTransactionID();
/**
* Set the processed status of each (incomplete) sub-request to
* {@code false}.
*/
void resetProcessedStatus();
/**
* Returns the value of the reprocessing counter associated with this request.
* The reprocessing counter can be used to detect and handle endless-loop
* errors caused by instrumentation code not setting the completion status
* of a sub-request correctly.
* @return
* 0 after the initial (and normally last) processing iteration and
* {@code n} after the {@code n}-th reprocessing iteration.
* @see #incReprocessCounter()
*/
int getReprocessCounter();
/**
* Increments the reprocess counter by one.
* @see #getReprocessCounter()
*/
void incReprocessCounter();
/**
* Gets the processing user object for the specified key. By default
* there is no such object associated with a request, but
* {@link ManagedObject}s may put their own objects into the request
* (for example to avoid unnecessary updates on behalf of the same request).
*
* @param key
* an Object.
* @return
* the associated Object or {@code null} if their exists no such
* association.
* @since 1.2
*/
Object getProcessingUserObject(Object key);
/**
* Sets an user object association.
*
* @param key
* a key Object.
* @param value
* a value Object associated with {@code key}.
* @return
* the previous value associated with {@code key} or {@code null}
* if no such association existed.
* @since 1.2
*/
Object setProcessingUserObject(Object key, Object value);
}
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