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%% Copyright Ericsson AB 2019-2019. All Rights Reserved.
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%% 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
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%%     http://www.apache.org/licenses/LICENSE-2.0
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%%

-module(snmpa_get_mechanism).

%%
%% This module defines the behaviour for the undocumented (hidden)
%% get-mechanism feature. This allows for implementing your own
%% handling of get, get-next and get-bulk requests.
%% Probably only useful for special cases (e.g. optimization).
%%



%% ----------- do_get/2,3 -----------------------------------------------------

%% Purpose: Handles all VBs in a request that is inside the 
%%          mibview (local).

-callback do_get(UnsortedVBs    :: [snmp:varbind()],
                 IsNotification :: boolean(),
                 Extra          :: term()) ->
    {noError, 0, ResVBs :: [snmp:varbind()]} |
    {ErrStatus :: snmp:error_status(), ErrIndex :: snmp:error_index(), []}.


%% Purpose: Handles "get-requests".

-callback do_get(MibView        :: snmp_view_based_acm_mib:mibview(), 
                 UnsortedVBs    :: [snmp:varbind()],
                 IsNotification :: boolean(),
                 Extra          :: term()) ->
    {noError, 0, ResVBs :: [snmp:varbind()]} |
    {ErrStatus :: snmp:error_status(), ErrIndex :: snmp:error_index(), []}.




%% ----------- do_get_next/2 ------------------------------------------------

%% Purpose: Handles "get-next-requests".

-callback do_get_next(MibView     :: snmp_view_based_acm_mib:mibview(),
                      UnsortedVBs :: [snmp:varbind()],
                      Extra       :: term()) ->
    {noError, 0, ResVBs :: [snmp:varbind()]} |
    {ErrStatus :: snmp:error_status(), ErrIndex :: snmp:error_index(), []}.




%% ----------- do_get_bulk/6 ------------------------------------------------

-callback do_get_bulk(MibView        :: snmp_view_based_acm_mib:mibview(),
                      NonRepeaters   :: non_neg_integer(),
                      MaxRepetitions :: non_neg_integer(),
                      PduMS          :: pos_integer(),
                      VBs            :: [snmp:varbind()],
                      MaxVBs         :: pos_integer(),
                      Extra          :: term()) ->
    {noError, 0, ResVBs :: [snmp:varbind()]} |
    {ErrStatus :: snmp:error_status(), ErrIndex :: snmp:error_index(), []}.