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/* Copyright 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
/**
* Utility macros for declaring global initializers
*
* Should NOT be included by other header files. Include only in source files.
*
* Initializers are arranged in an acyclic directed dependency graph. Declaring
* a cycle will lead to a runtime error.
*
* Initializer functions take a parameter of type ::mongo::InitializerContext*, and return
* a Status. Any status other than Status::OK() is considered a failure that will stop further
* intializer processing.
*/
#pragma once
#include "mongo/base/initializer.h"
#include "mongo/base/initializer_context.h"
#include "mongo/base/initializer_function.h"
#include "mongo/base/global_initializer.h"
#include "mongo/base/global_initializer_registerer.h"
#include "mongo/base/make_string_vector.h"
#include "mongo/base/status.h"
/**
* Convenience parameter representing an empty set of prerequisites for an initializer function.
*/
#define MONGO_NO_PREREQUISITES (NULL)
/**
* Convenience parameter representing an empty set of dependents of an initializer function.
*/
#define MONGO_NO_DEPENDENTS (NULL)
/**
* Convenience parameter representing the default set of dependents for initializer functions.
*/
#define MONGO_DEFAULT_PREREQUISITES ("default")
/**
* Macro to define an initializer function named "NAME" with the default prerequisites, and
* no explicit dependents.
*
* See MONGO_INITIALIZER_GENERAL.
*
* Usage:
* MONGO_INITIALIZER(myModule)(::mongo::InitializerContext* context) {
* ...
* }
*/
#define MONGO_INITIALIZER(NAME) \
MONGO_INITIALIZER_WITH_PREREQUISITES(NAME, MONGO_DEFAULT_PREREQUISITES)
/**
* Macro to define an initializer function named "NAME" that depends on the initializers
* specified in PREREQUISITES to have been completed, but names no explicit dependents.
*
* See MONGO_INITIALIZER_GENERAL.
*
* Usage:
* MONGO_INITIALIZER_WITH_PREREQUISITES(myGlobalStateChecker,
* ("globalStateInitialized", "stacktraces"))(
* ::mongo::InitializerContext* context) {
* }
*/
#define MONGO_INITIALIZER_WITH_PREREQUISITES(NAME, PREREQUISITES) \
MONGO_INITIALIZER_GENERAL(NAME, PREREQUISITES, MONGO_NO_DEPENDENTS)
/**
* Macro to define an initializer that depends on PREREQUISITES and has DEPENDENTS as explicit
* dependents.
*
* NAME is any legitimate name for a C++ symbol.
* PREREQUISITES is a tuple of 0 or more std::string literals, i.e., ("a", "b", "c"), or ()
* DEPENDENTS is a tuple of 0 or more std::string literals.
*
* At run time, the full set of prerequisites for NAME will be computed as the union of the
* explicit PREREQUISITES and the set of all other mongo initializers that name NAME in their
* list of dependents.
*
* Usage:
* MONGO_INITIALIZER_GENERAL(myInitializer,
* ("myPrereq1", "myPrereq2", ...),
* ("myDependent1", "myDependent2", ...))(
* ::mongo::InitializerContext* context) {
* }
*
* TODO: May want to be able to name the initializer separately from the function name.
* A form that takes an existing function or that lets the programmer supply the name
* of the function to declare would be options.
*/
#define MONGO_INITIALIZER_GENERAL(NAME, PREREQUISITES, DEPENDENTS) \
::mongo::Status _MONGO_INITIALIZER_FUNCTION_NAME(NAME)(::mongo::InitializerContext*); \
namespace { \
::mongo::GlobalInitializerRegisterer _mongoInitializerRegisterer_##NAME( \
#NAME, \
_MONGO_INITIALIZER_FUNCTION_NAME(NAME), \
MONGO_MAKE_STRING_VECTOR PREREQUISITES, \
MONGO_MAKE_STRING_VECTOR DEPENDENTS); \
} \
::mongo::Status _MONGO_INITIALIZER_FUNCTION_NAME(NAME)
/**
* Macro to define an initializer group.
*
* An initializer group is an initializer that performs no actions. It is useful for organizing
* initialization steps into phases, such as "all global parameter declarations completed", "all
* global parameters initialized".
*/
#define MONGO_INITIALIZER_GROUP(NAME, PREREQUISITES, DEPENDENTS) \
MONGO_INITIALIZER_GENERAL(NAME, PREREQUISITES, DEPENDENTS)(::mongo::InitializerContext*) { \
return ::mongo::Status::OK(); \
}
/**
* Macro to produce a name for a mongo initializer function for an initializer operation
* named "NAME".
*/
#define _MONGO_INITIALIZER_FUNCTION_NAME(NAME) _mongoInitializerFunction_##NAME
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