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/* Copyright 2012 10gen Inc.
*
* 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.
*/
#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"
#include "mongo/client/export_macros.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 MONGO_CLIENT_API 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.
*/
MONGO_CLIENT_API Status runGlobalInitializers(const InitializerContext::ArgumentVector& args,
const InitializerContext::EnvironmentMap& env);
MONGO_CLIENT_API 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.
*/
MONGO_CLIENT_API void runGlobalInitializersOrDie(
int argc, const char* const* argv, const char* const* envp);
} // namespace mongo
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