components/policy/core/common/policy_service_impl.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_
   6 #define COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/callback.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/observer_list.h"
  17 #include "components/policy/core/common/configuration_policy_provider.h"
  18 #include "components/policy/core/common/policy_bundle.h"
  19 #include "components/policy/core/common/policy_service.h"
  20 #include "components/policy/policy_export.h"
  21
  22 namespace policy {
  23
  24 class PolicyMap;
  25
  26 class POLICY_EXPORT PolicyServiceImpl
  27     : public PolicyService,
  28       public ConfigurationPolicyProvider::Observer {
  29  public:
  30   typedef std::vector<ConfigurationPolicyProvider*> Providers;
  31
  32   // The PolicyServiceImpl will merge policies from |providers|. |providers|
  33   // must be sorted in decreasing order of priority; the first provider will
  34   // have the highest priority. The PolicyServiceImpl does not take ownership of
  35   // the providers, and they must outlive the PolicyServiceImpl.
  36   explicit PolicyServiceImpl(const Providers& providers);
  37
  38   virtual ~PolicyServiceImpl();
  39
  40   // PolicyService overrides:
  41   virtual void AddObserver(PolicyDomain domain,
  42                            PolicyService::Observer* observer) OVERRIDE;
  43   virtual void RemoveObserver(PolicyDomain domain,
  44                               PolicyService::Observer* observer) OVERRIDE;
  45   virtual const PolicyMap& GetPolicies(
  46       const PolicyNamespace& ns) const OVERRIDE;
  47   virtual bool IsInitializationComplete(PolicyDomain domain) const OVERRIDE;
  48   virtual void RefreshPolicies(const base::Closure& callback) OVERRIDE;
  49
  50  private:
  51   typedef ObserverList<PolicyService::Observer, true> Observers;
  52   typedef std::map<PolicyDomain, Observers*> ObserverMap;
  53
  54   // ConfigurationPolicyProvider::Observer overrides:
  55   virtual void OnUpdatePolicy(ConfigurationPolicyProvider* provider) OVERRIDE;
  56
  57   // Posts a task to notify observers of |ns| that its policies have changed,
  58   // passing along the |previous| and the |current| policies.
  59   void NotifyNamespaceUpdated(const PolicyNamespace& ns,
  60                               const PolicyMap& previous,
  61                               const PolicyMap& current);
  62
  63   // Combines the policies from all the providers, and notifies the observers
  64   // of namespaces whose policies have been modified.
  65   void MergeAndTriggerUpdates();
  66
  67   // Checks if all providers are initialized, and notifies the observers
  68   // if the service just became initialized.
  69   void CheckInitializationComplete();
  70
  71   // Invokes all the refresh callbacks if there are no more refreshes pending.
  72   void CheckRefreshComplete();
  73
  74   // The providers passed in the constructor, in order of decreasing priority.
  75   Providers providers_;
  76
  77   // Maps each policy namespace to its current policies.
  78   PolicyBundle policy_bundle_;
  79
  80   // Maps each policy domain to its observer list.
  81   ObserverMap observers_;
  82
  83   // True if all the providers are initialized for the indexed policy domain.
  84   bool initialization_complete_[POLICY_DOMAIN_SIZE];
  85
  86   // Set of providers that have a pending update that was triggered by a
  87   // call to RefreshPolicies().
  88   std::set<ConfigurationPolicyProvider*> refresh_pending_;
  89
  90   // List of callbacks to invoke once all providers refresh after a
  91   // RefreshPolicies() call.
  92   std::vector<base::Closure> refresh_callbacks_;
  93
  94   // Used to create tasks to delay new policy updates while we may be already
  95   // processing previous policy updates.
  96   base::WeakPtrFactory<PolicyServiceImpl> update_task_ptr_factory_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(PolicyServiceImpl);
  99 };
 100
 101 }  // namespace policy
 102
 103 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_SERVICE_IMPL_H_