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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.
*/
#pragma once
#include <string>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/initializer_context.h"
#include "mongo/base/initializer_dependency_graph.h"
#include "mongo/base/status.h"
namespace mongo {
/**
* Class representing an initialization process.
*
* Such a process is described by a directed acyclic graph of initialization operations, the
* InitializerDependencyGraph. One constructs an initialization process by adding nodes and
* edges to the graph. Then, one executes the process, causing each initialization operation to
* execute in an order that respects the programmer-established prerequistes.
*/
class Initializer {
MONGO_DISALLOW_COPYING(Initializer);
public:
Initializer();
~Initializer();
/**
* Get the initializer dependency graph, presumably for the purpose of adding more nodes.
*/
InitializerDependencyGraph& getInitializerDependencyGraph() { return _graph; }
/**
* Execute the initializer process, using the given argv and environment data as input.
*
* Returns Status::OK on success. All other returns constitute initialization failures,
* and the thing being initialized should be considered dead in the water.
*/
Status execute(const InitializerContext::ArgumentVector& args,
const InitializerContext::EnvironmentMap& env) const;
private:
InitializerDependencyGraph _graph;
};
/**
* Run the global initializers.
*
* It's a programming error for this to fail, but if it does it will return a status other
* than Status::OK.
*
* This means that the few initializers that might want to terminate the program by failing
* should probably arrange to terminate the process themselves.
*/
Status runGlobalInitializers(const InitializerContext::ArgumentVector& args,
const InitializerContext::EnvironmentMap& env);
Status runGlobalInitializers(
int argc, const char* const* argv, const char* const* envp);
/**
* Same as runGlobalInitializers(), except prints a brief message to std::cerr
* and terminates the process on failure.
*/
void runGlobalInitializersOrDie(
int argc, const char* const* argv, const char* const* envp);
} // namespace mongo
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