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<TITLE>Resource Skeletons</TITLE>
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<H2>5 Resource Skeletons</H2>
<A NAME="5.1"><!-- Empty --></A>
<H3>5.1 Resource Skeletons</H3>
<P> This chapter provides a skeleton for application Resources. For more information
see the Orber documentation.
<PRE>
%%%-----------------------------------------------------------
%%% File : Module_Interface_impl.erl
%%% Author :
%%% Purpose :
%%% Created :
%%%-----------------------------------------------------------
-module('Module_Interface_impl').
%%--------------- INCLUDES -----------------------------------
-include_lib("orber/include/corba.hrl").
-include_lib("cosTransactions/include/CosTransactions.hrl").
%%--------------- EXPORTS-------------------------------------
%%- Inherit from CosTransactions::Resource -------------------
-export([prepare/2,
rollback/2,
commit/2,
commit_one_phase/2,
forget/2]).
%%- Inherit from CosTransactions::SubtransactionAwareResource
-export([commit_subtransaction/3,
rollback_subtransaction/2]).
%%--------------- gen_server specific ------------------------
-export([init/1, terminate/2, code_change/3, handle_info/2]).
%%------------------------------------------------------------
%% function : gen_server specific
%%------------------------------------------------------------
init(Env) ->
%% 'trap_exit' optional
process_flag(trap_exit,true),
%%--- Possible replies ---
%% Reply and await next request
{ok, State}.
%% Reply and if no more requests within Time the special
%% timeout message should be handled in the
%% Module_Interface_impl:handle_info/2 call-back function (use the
%% IC option {{handle_info, "Module::Interface"}, true}).
{ok, State, TimeOut}.
%% Return ignore in order to inform the parent, especially if it is a
%% supervisor, that the server, as an example, did not start in
%% accordance with the configuration data.
ignore.
%% If the initializing procedure fails, the reason
%% is supplied as StopReason.
{stop, StopReason}.
terminate(Reason, State) ->
ok.
code_change(OldVsn, State, Extra) ->
{ok, NewState}.
%% If use IC option {{handle_info, "Module::Interface"}, true}
handle_info(Info, State) ->
%%--- Possible replies ---
%% Await the next invocation.
{noreply, State}.
%% Stop with Reason.
{stop, Reason, State}.
%%- Inherit from CosTransactions::Resource -------------------
prepare(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
%% If no data related to the transaction changed.
{reply, 'VoteReadOnly', State}
%% .. or (for example):
{stop, normal, 'VoteReadOnly', State}.
%% If able to commit
{reply, 'VoteCommit', State}
%% If not able to commit
{reply, 'VoteRollback', State}
%% .. or (for example):
{stop, normal, 'VoteRollback', State}.
rollback(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
%% If able to rollback successfully
{reply, ok, State}
%% .. or (for example):
{stop, normal, ok, State}.
%% If Heuristic Decision. Raise exception:
corba:raise(#'CosTransactions_HeuristicMixed' {})
corba:raise(#'CosTransactions_HeuristicHazard' {})
corba:raise(#'CosTransactions_HeuristicCommit'{})
commit(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
%% If able to commit successfully
{reply, ok, State}
%% .. or (for example):
{stop, normal, ok, State}.
%% If the prepare operation never been invoked:
corba:raise(#'CosTransactions_NotPrepared'{})
%% If Heuristic Decision. Raise exception:
corba:raise(#'CosTransactions_HeuristicMixed' {})
corba:raise(#'CosTransactions_HeuristicHazard' {})
corba:raise(#'CosTransactions_HeuristicRollback'{})
commit_one_phase(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
%% If able to commit successfully
{reply, ok, State}
%% .. or (for example):
{stop, normal, ok, State}.
%% If failes. Raise exception:
corba:raise(#'CosTransactions_HeuristicHazard' {})
%% If able to rollback successfully
corba:raise(#'CosTransactions_TransactionRolledBack' {})
forget(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
{reply, ok, State}.
%% .. or (for example):
{stop, normal, ok, State}.
%%%%%% If the Resource is also supposed to be a %%%%%%
%%%%%% SubtransactionAwareResource implement these. %%%%%%
%%- Inherit from CosTransactions::SubtransactionAwareResource
commit_subtransaction(State, Parent) ->
%%% Do application specific actions here %%%
%%-- Reply: --
{reply, ok, State}.
%% .. or (for example):
{stop, normal, ok, State}.
rollback_subtransaction(State) ->
%%% Do application specific actions here %%%
%%-- Reply: --
{reply, ok, State}.
%% .. or (for example):
{stop, normal, ok, State}.
%%--------------- END OF MODULE ------------------------------
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