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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_KEYED_SERVICE_CORE_DEPENDENCY_GRAPH_H_
#define COMPONENTS_KEYED_SERVICE_CORE_DEPENDENCY_GRAPH_H_
#include <map>
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "components/keyed_service/core/keyed_service_export.h"
class DependencyNode;
// Dynamic graph of dependencies between nodes.
class KEYED_SERVICE_EXPORT DependencyGraph {
public:
DependencyGraph();
~DependencyGraph();
// Adds/Removes a node from our list of live nodes. Removing will
// also remove live dependency links.
void AddNode(DependencyNode* node);
void RemoveNode(DependencyNode* node);
// Adds a dependency between two nodes.
void AddEdge(DependencyNode* depended, DependencyNode* dependee);
// Topologically sorts nodes to produce a safe construction order
// (all nodes after their dependees).
bool GetConstructionOrder(std::vector<DependencyNode*>* order)
WARN_UNUSED_RESULT;
// Topologically sorts nodes to produce a safe destruction order
// (all nodes before their dependees).
bool GetDestructionOrder(std::vector<DependencyNode*>* order)
WARN_UNUSED_RESULT;
// Returns representation of the dependency graph in graphviz format.
std::string DumpAsGraphviz(const std::string& toplevel_name,
const base::Callback<std::string(DependencyNode*)>&
node_name_callback) const;
private:
typedef std::multimap<DependencyNode*, DependencyNode*> EdgeMap;
// Populates |construction_order_| with computed construction order.
// Returns true on success.
bool BuildConstructionOrder() WARN_UNUSED_RESULT;
// Keeps track of all live nodes (see AddNode, RemoveNode).
std::vector<DependencyNode*> all_nodes_;
// Keeps track of edges of the dependency graph.
EdgeMap edges_;
// Cached construction order (needs rebuild with BuildConstructionOrder
// when empty).
std::vector<DependencyNode*> construction_order_;
DISALLOW_COPY_AND_ASSIGN(DependencyGraph);
};
#endif // COMPONENTS_KEYED_SERVICE_CORE_DEPENDENCY_GRAPH_H_
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