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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
#define COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
#include <array>
#include <set>
#include "base/compiler_specific.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "base/sequence_checker.h"
#include "components/policy/core/common/policy_namespace.h"
#include "components/policy/core/common/schema.h"
#include "components/policy/core/common/schema_map.h"
#include "components/policy/policy_export.h"
namespace policy {
class SchemaMap;
// Holds the main reference to the current SchemaMap, and allows a list of
// observers to get notified whenever it is updated.
// This object is not thread safe and must be used from the owner's thread,
// usually UI.
class POLICY_EXPORT SchemaRegistry {
public:
class POLICY_EXPORT Observer {
public:
// Invoked whenever schemas are registered or unregistered.
// |has_new_schemas| is true if a new component has been registered since
// the last update; this allows observers to ignore updates when
// components are unregistered but still get a handle to the current map
// (e.g. for periodic reloads).
virtual void OnSchemaRegistryUpdated(bool has_new_schemas) = 0;
// Invoked when all policy domains become ready.
virtual void OnSchemaRegistryReady() {}
protected:
virtual ~Observer();
};
// This observer is only meant to be used by subclasses.
class POLICY_EXPORT InternalObserver {
public:
// Invoked when |registry| is about to be destroyed.
virtual void OnSchemaRegistryShuttingDown(SchemaRegistry* registry) = 0;
protected:
virtual ~InternalObserver();
};
SchemaRegistry();
SchemaRegistry(const SchemaRegistry&) = delete;
SchemaRegistry& operator=(const SchemaRegistry&) = delete;
virtual ~SchemaRegistry();
const scoped_refptr<SchemaMap>& schema_map() const { return schema_map_; }
// Register a single component.
void RegisterComponent(const PolicyNamespace& ns,
const Schema& schema);
// Register a list of components for a given domain.
virtual void RegisterComponents(PolicyDomain domain,
const ComponentMap& components);
virtual void UnregisterComponent(const PolicyNamespace& ns);
// Returns true if all domains have registered the initial components.
bool IsReady() const;
// This indicates that the initial components for |domain| have all been
// registered. It must be invoked at least once for each policy domain;
// subsequent calls for the same domain are ignored.
void SetDomainReady(PolicyDomain domain);
// This is equivalent to calling |SetDomainReady| with each of the policy
// domains.
void SetAllDomainsReady();
// This is equivalent to calling |SetDomainReady| with each of the domains
// that correspond to policy for extensions.
void SetExtensionsDomainsReady();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
void AddInternalObserver(InternalObserver* observer);
void RemoveInternalObserver(InternalObserver* observer);
protected:
void Notify(bool has_new_schemas);
SEQUENCE_CHECKER(sequence_checker_);
scoped_refptr<SchemaMap> schema_map_;
private:
base::ObserverList<Observer, true>::Unchecked observers_;
base::ObserverList<InternalObserver, true>::Unchecked internal_observers_;
std::array<bool, POLICY_DOMAIN_SIZE> domains_ready_;
};
// A registry that combines the maps of other registries.
class POLICY_EXPORT CombinedSchemaRegistry
: public SchemaRegistry,
public SchemaRegistry::Observer,
public SchemaRegistry::InternalObserver {
public:
CombinedSchemaRegistry();
CombinedSchemaRegistry(const CombinedSchemaRegistry&) = delete;
CombinedSchemaRegistry& operator=(const CombinedSchemaRegistry&) = delete;
~CombinedSchemaRegistry() override;
void Track(SchemaRegistry* registry);
// SchemaRegistry:
void RegisterComponents(PolicyDomain domain,
const ComponentMap& components) override;
void UnregisterComponent(const PolicyNamespace& ns) override;
// SchemaRegistry::Observer:
void OnSchemaRegistryUpdated(bool has_new_schemas) override;
// SchemaRegistry::InternalObserver:
void OnSchemaRegistryShuttingDown(SchemaRegistry* registry) override;
private:
void Combine(bool has_new_schemas);
std::set<raw_ptr<SchemaRegistry, SetExperimental>> registries_;
scoped_refptr<SchemaMap> own_schema_map_;
};
// A registry that wraps another schema registry.
class POLICY_EXPORT ForwardingSchemaRegistry
: public SchemaRegistry,
public SchemaRegistry::Observer,
public SchemaRegistry::InternalObserver {
public:
// This registry will stop updating its SchemaMap when |wrapped| is
// destroyed.
explicit ForwardingSchemaRegistry(SchemaRegistry* wrapped);
ForwardingSchemaRegistry(const ForwardingSchemaRegistry&) = delete;
ForwardingSchemaRegistry& operator=(const ForwardingSchemaRegistry&) = delete;
~ForwardingSchemaRegistry() override;
// SchemaRegistry:
void RegisterComponents(PolicyDomain domain,
const ComponentMap& components) override;
void UnregisterComponent(const PolicyNamespace& ns) override;
// SchemaRegistry::Observer:
void OnSchemaRegistryUpdated(bool has_new_schemas) override;
void OnSchemaRegistryReady() override;
// SchemaRegistry::InternalObserver:
void OnSchemaRegistryShuttingDown(SchemaRegistry* registry) override;
private:
void UpdateReadiness();
raw_ptr<SchemaRegistry> wrapped_;
};
} // namespace policy
#endif // COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
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